US 5,484,807 AGrant
Haloalkylthio, -Sulfinyl and -Sulfonyl Arylpyrrole Insecticidal and Acaricidal Agents
Issue Date:1996-01-16
•11 Claims
Abstract
Haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds which are effective for the control of insects and acarids are described. A method for the insecticidal and acaricidal use of said compounds and methods for the preparation of said compounds are presented.
Metadata
Inventors
- Keith D. Barnes
- Victor M. Kamhi
- Robert E. Diehl
Application Information
Application Number:US 4359054
Filing Date:1995-05-05
Priority Date:1991-12-04
Art Unit:129
Classifications
IPC:
A01N 4336
Field of Search:
514423;424;425
Patent Drawings
This patent does not have any drawings.
Description
BACKGROUND OF THE INVENTION
Substituted arylpyrroles and their use as insecticidal agents are described in co-pending U.S. patent application Ser. No. 07/392,495 filed on Aug. 11, 1989, now abandoned. None of the arylpyrroles disclosed in that patent application are within the scope of the present invention.
It is an object of the present invention to provide haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds that are highly effective for controlling insects and acarina. It is also an object of the invention to protect growing and harvested crops from attack or infestation by insects and acarina.
These and other objectives of the invention will become more apparent from the detailed description thereof set forth below.
SUMMARY OF THE INVENTION
The present invention describes haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds that are highly effective insecticidal and acaricidal agents useful for the control of insect and acarid pests and for protecting agronomic crops from the ravages of said pests.
The haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds of the present invention have the structural formula I ##STR1## wherein W is S(O).sub.n CF.sub.2 R.sub.1 ;
R.sub.1 is H, F, Cl, Br, CF.sub.2 H, CCl.sub.2 H, CClFH, CF.sub.3 or CCl.sub.3 ;
n is an integer of 0, 1 or 2;
X is phenyl optionally substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5 groups;
B is S(O).sub.n or O;
R.sub.2 is H, F, CF.sub.2 H, CClFH or CF.sub.3 ;
R.sub.3 is C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy or NR.sub.4 R.sub.5 ;
R.sub.4 is H or C.sub.1 -C.sub.3 alkyl;
R.sub.5 is H or C.sub.1 -C.sub.3 alkyl or R.sub.6 CO;
R.sub.6 is H or C.sub.1 -C.sub.3 alkyl;
Y is H, halogen, CF.sub.3, CN, NO.sub.2, S(O).sub.n CF.sub.2 R.sub.1 or phenyl optionally substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5 groups;
Z is H, halogen or CF.sub.3 ;
R is H, CN, ##STR2## CH.sub.2 SQ, C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
one tri(C.sub.1 -C.sub.4 alkyl)silyl,
one hydroxy,
one cyano,
one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
one C.sub.1 -C.sub.4 alkylthio,
one phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkylcarbonyloxy group optionally substituted with one to three halogen atoms,
one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzylcarbonyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups, or
one 2-furylcarbonyloxy group,
C.sub.3 -C.sub.6 alkenyl optionally substituted with one to three halogen atoms or one phenyl group, or
C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three halogen atoms or one phenyl group;
R.sub.7 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl each optionally substituted with
one to three halogen atoms,
one hydroxy,
one cyano,
one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
one C.sub.1 -C.sub.4 alkylthio,
one phenyl group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkyl carbonyloxy group optionally substituted with one to three halogen atoms,
one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms, or one to three C.sub.1 -C.sub.4 alkoxy groups, or
one benzyloxycarbonyl group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
C.sub.2 -C.sub.6 alkenyl optionally substituted with one to three halogen atoms or one phenyl group,
C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three halogen atoms or one phenyl group,
phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups, one C.sub.5 -C.sub.12 alkyl group, one to two C.sub.1 -C.sub.4 alkoxy groups, or one phenoxy, C.sub.1 -C.sub.4 alkylthio, trialkylsilyl, C.sub.1 -C.sub.4 alkylsulfinyl, C.sub.1 -C.sub.4 alkylsulfonyl, carbo-C.sub.1 -C.sub.4 -alkoxy, carboxy, CF.sub.3, CN, NO.sub.2, di(C.sub.1 -C.sub.4 alkyl)amino, R.sub.2 CF.sub.2 B or C.sub.1 -C.sub.4 alkanoylamino,
phenoxy optionally substituted with one to three halogen atoms, one or two C.sub.1 -C.sub.4 alkyl groups, one or two C.sub.1 -C.sub.4 alkoxy groups, trialkylsilyl, CF.sub.3, CN, NO.sub.2, or di(C.sub.1 -C.sub.4 alkyl)amino groups, or C.sub.1 -C.sub.4 alkanoylamino,
1- or 2-naphthyl,
2-, 3-, or 4-pyridyl optionally substituted with one to three halogen atoms, a heteroaromatic 5-membered ring containing an oxygen, nitrogen, or a sulfur atom, and optionally substituted with one to three halogen atoms,
C.sub.1 -C.sub.6 alkoxy group optionally substituted with one to three halogen atoms; or
C.sub.2 -C.sub.6 alkenyloxy group optionally substituted with one to three halogen atoms;
R.sub.8 is hydrogen or C.sub.1 -C.sub.4 alkyl;
R.sub.9 is C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
phenyl optionally substituted with one or two halogen, CN, NO.sub.2, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or CF.sub.3 groups,
2- or 3-thienyl or
2- or 3-furyl;
Q is ##STR3## CN, C.sub.1 -C.sub.6 alkyl optionally substituted with one or more phenyl, CN or halogen groups or phenyl optionally substituted with one to three C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, halogen, CN, NO.sub.2, CF.sub.3 or NR.sub.21 R.sub.22 groups;
A is O or S;
R.sub.10 is C.sub.1 -C.sub.6 alkyl or phenyl;
R.sub.11 is C.sub.1 -C.sub.6 alkyl;
R.sub.12 and R.sub.13 are each independently hydrogen, C.sub.1 -C.sub.6 alkyl or may be taken together with the atom to which they are attached to form a 5- to 7- membered ring;
R.sub.14 is C.sub.1 -C.sub.4 alkyl;
R.sub.15 is hydrogen, C.sub.1 -C.sub.4 alkyl or may be taken together with either R.sub.16 or R.sub.18 and the atoms to which they are attached to form a 5- to 7-membered ring optionally substituted with one or two C.sub.1 -C.sub.3 alkyl groups;
R.sub.16 and R.sub.17 are each independently hydrogen or C.sub.1 -C.sub.4 alkyl;
R.sub.18 is C.sub.1 -C.sub.4 alkyl or when taken together with R.sub.15 and the atoms to which they are attached may form a 5- to 7- membered ring optionally substituted with one or two C.sub.1 -C.sub.3 alkyl groups;
R.sub.19 and R.sub.20 are each independently hydrogen or C.sub.1 -C.sub.3 alkyl or when taken together may form a ring wherein R.sub.19 R.sub.20 is represented by --C.dbd.C--C.dbd.C--; and
R.sub.21 and R.sub.22 are each independently hydrogen or C.sub.1 -C.sub.3 alkyl.
DETAILED DESCRIPTION OF THE INVENTION
The haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds of the present invention are excellent insecticidal and acaricidal agents. The present invention provides a method for controlling undesirable insects and acarina by applying an insecticidally or acaricidally effective amount of a haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole compound to the breeding grounds, food supply or habitat of said pests. Preferred haloalkylthio, -sulfinyl and -sulfonyl arylpyrroles have the structural formula II ##STR4## wherein W is S(O).sub.n CF.sub.2 R.sub.1 ;
X is phenyl substituted with one to three halogen, CN, NO.sub.2, CF.sub.3 or R.sub.2 CF.sub.2 B groups;
Y is Cl, Br, CF.sub.3, CN or S(O).sub.n CF.sub.2 R.sub.1 ;
Z is H, Cl, Br or CF.sub.3 ;
R is H, CN, ##STR5## or C.sub.1 -C.sub.4 alkyl optionally substituted with one to three halogen atoms, one C.sub.1 -C.sub.4 alkoxy group, one cyano, one C.sub.1 -C.sub.6 alkylcarbonyloxy group, one phenylcarbonyloxy group optionally substituted with one to three halogen atoms or one C.sub.1 -C.sub.4 alkyl group, one benzylcarbonyloxy group or one 2-furylcarbonyloxy group; and
R.sub.7 is phenyl optionally substituted with one to three halogen atoms, one or two C.sub.1 -C.sub.4 alkyl groups, one or two C.sub.1 -C.sub.4 alkoxy groups, CF.sub.3, CN, NO.sub.2 or R.sub.2 CF.sub.2 B.
By the term halogen we intend an atom selected from the group consisting of F, Cl, Br and I.
Preferred formula II compounds which are especially effective as insecticidal and/or acaricidal agents are illustrated by formula III and formula IV ##STR6## wherein W is SO.sub.n CF.sub.3 ;
X is phenyl substituted with one to three halogen atoms or CF.sub.3 ;
Y is Cl, Br, CF.sub.3, CN or S(O).sub.n CF.sub.3 ;
Z is H, Cl, Br or CF.sub.3 ; and
R is H or C.sub.1 -C.sub.4 alkyl substituted with one C.sub.1 -C.sub.4 alkoxy group.
The present invention also relates to novel haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds having the structural formula V ##STR7## wherein W is S(O).sub.n CF.sub.2 R.sub.1 ;
R.sub.1 is H, F, Cl, Br, CF.sub.2 H, CCl.sub.2 H, CClFH, CF.sub.3 or CCl.sub.3 ;
n is an integer of 0, 1 or 2;
X is phenyl substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5 groups;
B is S(O).sub.n or O;
R.sub.2 is H, F, CF.sub.2 H, CClFH or CF.sub.3 ;
R.sub.3 is C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy or NR.sub.4 R.sub.5 ;
R.sub.4 is H or C.sub.1 -C.sub.3 alkyl;
R.sub.5 is H or C.sub.1 -C.sub.3 alkyl or R.sub.6 CO;
R.sub.6 is H or C.sub.1 -C.sub.3 alkyl;
Y is H, halogen, CF.sub.3, CN, NO.sub.2, S(O).sub.n CF.sub.2 R.sub.1 or phenyl substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5 groups;
Z is H, halogen or CF.sub.3 ;
R is H, CN, ##STR8## CH.sub.2 SQ, C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
one tri(C.sub.1 -C.sub.4 alkyl)silyl,
one hydroxy,
one cyano,
one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
one C.sub.1 -C.sub.4 alkylthio,
one phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkylcarbonyloxy group optionally substituted with one to three halogen atoms,
one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzylcarbonyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups, or
one 2-furylcarbonyloxy group,
C.sub.3 -C.sub.6 alkenyl optionally substituted with one to three halogen atoms or one phenyl group, or
C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three halogen atoms or one phenyl group;
R.sub.7 is C.sub.1 -C.sub.6 alkyl or C.sub.3 -C.sub.6 cycloalkyl each optionally substituted with
one to three halogen atoms,
one hydroxy,
one cyano,
one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms,
one C.sub.1 -C.sub.4 alkylthio,
one phenyl group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one phenoxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one benzyloxy group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkyl carbonyloxy group optionally substituted with one to three halogen atoms,
one C.sub.2 -C.sub.6 alkenylcarbonyloxy group optionally substituted with one to three halogen atoms,
one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
one C.sub.1 -C.sub.6 alkoxycarbonyl group optionally substituted with one to three halogen atoms, or one to three C.sub.1 -C.sub.4 alkoxy groups, or
one benzyloxycarbonyl group optionally substituted on the phenyl ring with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups,
C.sub.2 -C.sub.6 alkenyl optionally substituted with one to three halogen atoms or one phenyl group,
C.sub.3 -C.sub.6 alkynyl optionally substituted with one to three halogen atoms or one phenyl group,
phenyl optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups, one C.sub.5 -C.sub.12 alkyl group, one to two C.sub.1 -C.sub.4 alkoxy groups, or one phenoxy, C.sub.1 -C.sub.4 alkylthio, trialkylsilyl, C.sub.1 -C.sub.4 alkylsulfinyl, C.sub.1 -C.sub.4 alkylsulfonyl, carbo-C.sub.1 -C.sub.4 -alkoxy, carboxy, CF.sub.3, CN, NO.sub.2, di(C.sub.1 -C.sub.4 alkyl)amino, R.sub.2 CF.sub.2 B or C.sub.1 -C.sub.4 alkanoylamino,
phenoxy optionally substituted with one to three halogen atoms, one or two C.sub.1 -C.sub.4 alkyl groups, one or two C.sub.1 -C.sub.4 alkoxy groups, trialkylsilyl, CF.sub.3, CN, NO.sub.2, or di(C.sub.1 -C.sub.4 alkyl)amino groups, or C.sub.1 -C.sub.4 alkanoylamino,
1- or 2-naphthyl,
2-, 3-, or 4-pyridyl optionally substituted with one to three halogen atoms, a heteroaromatic 5-membered ring containing an oxygen, nitrogen, or a sulfur atom, and optionally substituted with one to three halogen atoms,
C.sub.1 -C.sub.6 alkoxy group optionally substituted with one to three halogen atoms; or
C.sub.2 -C.sub.6 alkenyloxy group optionally substituted with one to three halogen atoms;
R.sub.8 is hydrogen or C.sub.1 -C.sub.4 alkyl;
R.sub.9 is C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms,
phenyl optionally substituted with one or two halogen, CN, NO.sub.2, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or CF.sub.3 groups,
2- or 3-thienyl or
2- or 3-furyl;
Q is ##STR9## CN, C.sub.1 -C.sub.6 alkyl optionally substituted with one or more phenyl, CN or halogen groups or phenyl optionally substituted with one to three C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, halogen, CN, NO.sub.2, CF.sub.3 or NR.sub.21 R.sub.22 groups;
A is O or S;
R.sub.10 is C.sub.1 -C.sub.6 alkyl or phenyl;
R.sub.11 is C.sub.1 -C.sub.6 alkyl;
R.sub.12 and R.sub.13 are each independently hydrogen, C.sub.1 -C.sub.6 alkyl or may be taken together with the atom to which they are attached to form a 5- to 7- membered ring;
R.sub.14 is C.sub.1 -C.sub.4 alkyl;
R.sub.15 is hydrogen, C.sub.1 -C.sub.4 alkyl or may be taken together with either R.sub.16 or R.sub.18 and the atoms to which they are attached to form a 5- to 7-membered ring optionally substituted with one or two C.sub.1 -C.sub.3 alkyl groups;
R.sub.16 and R.sub.17 are each independently hydrogen or C.sub.1 -C.sub.4 alkyl;
R.sub.18 is C.sub.1 -C.sub.4 alkyl or when taken together with R.sub.15 and the atoms to which they are attached may form a 5- to 7- membered ring optionally substituted with one or two C.sub.1 -C.sub.3 alkyl groups;
R.sub.19 and R.sub.20 are each independently hydrogen or C.sub.1 -C.sub.3 alkyl or when taken together may form a ring wherein R.sub.19 R.sub.20 is represented by --C.dbd.C--C.dbd.C--; and
R.sub.21 and R.sub.22 are each independently hydrogen or C.sub.1 -C.sub.3 alkyl;
provided that when R is H or C.sub.1 -C.sub.6 alkyl, X is attached to a carbon atom adjacent to the pyrrole ring nitrogen atom; and when Y is substituted phenyl, X and Y cannot be attached to the pyrrole ring at positions two and three.
Certain haloalkylsulfonyl arylpyrrole compounds of formula I, wherein W is SO.sub.2 CF.sub.2 R.sub.1, Y, Z and R are H, and X and R.sub.1 are as described above for formula I, may be prepared by reacting an arylethynyl haloalkylsulfonyl compound of formula VI
wherein X and R.sub.1 are as described above with at least one molar equivalent of an aminoacetaldehyde di(C.sub.1 -C.sub.4 alkyl) acetal to give the appropriately substituted {{.alpha.-[(haloalkylsulfonyl)methylene]benzyl}amino}acetaldehyde di(C.sub.1 -C.sub.4 alkyl) acetal of formula VII. The formula VII intermediate is then reacted with excess trifluoroacetic acid to give the appropriately substituted 3-haloalkylsulfonyl-2-arylpyrrole of formula VIII. The above reaction scheme is shown below in Flow Diagram I. ##STR10##
Certain haloalkylthio arylpyrroles of formula I may be prepared by reacting a 2-arylpyrrole compound with an excess of a haloalkylsulfenyl chloride compound and at least one molar equivalent of a base to give the appropriately substituted 5-haloalkylthio-2-arylpyrrole compound of formula IX. This reaction may be illustrated as follows: ##STR11## wherein X and R.sub.1 are as described for formula I above.
Preparation of N-substituted formula I haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds can be achieved by reaction of the appropriately substituted formula I haloalkylthio-, -sulfinyl or -sulfonyl arylpyrrole having R as hydrogen with an alkylating or acylating agent in the presence of an alkali metal alkoxide or hydride. For example, a formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole, wherein R is hydrogen and W, X, Y and Z are as described for formula I above, is reacted with an appropriate alkylating agent such as a C.sub.1 -C.sub.6 alkylhalide in which the alkyl group is straight or branched and is optionally substituted with from one to three halogen atoms, one hydroxy, one cyano, one C.sub.1 -C.sub.4 alkoxy, one C.sub.1 -C.sub.4 alkylthio, one phenyl group, optionally substituted with from one to three halogen atoms, or one benzyloxy group, optionally substituted with from one to three halogen atoms, and an alkali metal alkoxide such as sodium or potassium t-butoxide. This reaction provides a haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole having the same substituents as the starting material, but in addition is substituted on the nitrogen with a C.sub.1 -C.sub.6 alkyl group optionally substituted as described above. This reaction may be illustrated as follows: ##STR12## wherein W, X, Y and Z are as described for formula I above and R is C.sub.1 -C.sub.6 alkyl optionally substituted as described above. In a similar reaction cyanogen bromide is substituted for the alkylhalide and yields the formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole having a carbonitrile, rather than an alkyl group, on the nitrogen.
Advantageously, the above-described alkylation procedure of the formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole compounds, in which R is hydrogen may also be applied to the preparation of formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrroles having an N-C.sub.3 -C.sub.6 alkenyl or N-C.sub.3 -C.sub.6 alkynyl substituent. This N-substitution is obtained by simply substituting a C.sub.3 -C.sub.6 alkenyl halide or C.sub.3 -C.sub.6 alkynyl halide for the C.sub.1 -C.sub.6 alkyl halide in the above-described reaction.
In a similar manner, preparation of N-acylated haloalkylthio, -sulfinyl or sulfonyl arylpyrrole compounds may be achieved by the reaction of an appropriately substituted formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole wherein R is hydrogen with an acylating agent in the presence of an alkali metal alkoxide. Acylating agents such as C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl acid chloride, substituted C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenyl acid chloride, benzoyl chloride, substituted benzoyl chloride, phenylchloroformate, substituted phenylchloroformate, C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenylchloroformate, substituted C.sub.1 -C.sub.6 alkyl or C.sub.2 -C.sub.6 alkenylchloroformate, N-substituted carbamoyl chloride and the like may be employed. The reaction may be illustrated as follows: ##STR13## wherein Y is halogen, W is an alkali metal and W, X, Y, Z and R.sub.7 are as described hereinabove for formula I.
N-substituted formula I haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds wherein R is CH.sub.2 SQ may be prepared by reaction of the appropriately substituted formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole having R as chloromethyl with an alkali metal salt of an SQ compound in the presence of a base. For example, a formula I haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole, wherein R is chloromethyl and W, X, Y and Z are as described for formula I above, is reacted with sodium dimethyldithiocarbamate dihydrate and a base such as sodium hydroxide. This reaction provides a haloalkylthio, -sulfinyl or -sulfonyl arylpyrrole having the same substituents as the starting material, but in addition is substituted on the nitrogen with a methyl dimethyldithiocarbamate group. This reaction may be illustrated as follows: ##STR14## wherein W, X, Y and Z are as described for formula I above.
Pyrroles substituted on the nitrogen atom with CH.sub.2 S.sub.Q are also described in copending patent application Ser. No. 07/392,495 filed concurrently herewith now abandoned and incorporated herein by reference thereto.
Other methods for the preparation of formula I haloalkylthio, -sulfinyl and -sulfonyl arylpyrrole compounds will become apparent from the examples set forth below.
The compounds of the present invention are effective for controlling insects and acarina. These compounds are also effective for protecting growing or harvested crops from attack by the above-said pests.
In practice generally about 10 ppm to 10,000 ppm and preferably 100 ppm to about 5,000 ppm of a formula I compound, dispersed in water, or another inexpensive liquid carrier, is effective when applied to the plants, the crops or the soil in which said crops are growing to protect said crops from attack by insects and acarina.
The formula I compounds of this invention are also effective for controlling insects and acarina, when applied to the foliage of plants and/or to the soil or water in which said plants are growing in sufficient amount to provide a rate of from about 0.100 kg/ha to 4.0 kg/ha of active ingredient.
While the compounds of this invention are effective for controlling insects and acarina when employed alone, they may also be used in combination with other biological chemicals, including other insecticides and acaricides. For example, the formula I compounds of this invention may be used effectively in conjunction or combination with phosphates, carbamates, pyrethroids, formamidines, chlorinated hydrocarbons, halobenzoylureas and the like.
The compounds of the invention may be formulated as emulsifiable concentrates, flowable concentrates, or wettable powders which are diluted with water or other suitable polar solvent, generally in situ, and then applied as a dilute spray. Said compounds may also be formulated in dry compacted granules, granular formulations, dusts, dust concentrates, suspension concentrates, microemulsions and the like all of which lend themselves to seed, soil, water and/or foliage applications to provide the requisite plant protection. Such formulations include the compounds of the invention admixed with inert, solid or liquid diluents.
For example, wettable powders, dusts, and dust concentrate formulations can be prepared by grinding and blending together about 25% to about 85% by weight of formula I compounds and about 75% to about 15% by weight of a solid diluent such as bentonite, diatomaceous earth, kaolin, attapulgite, or the like, 1% to 5% by weight of a dispersing agent such as sodium lignosulfonate, and about 1% to 5% by weight of a nonionic surfactant, such as octylphenoxy polyethoxy ethanol, nonylphenoxy polyethoxy ethanol or the like.
A typical flowable liquid can be prepared by admixing about 30% to 90% by weight of a gelling agent such as bentonite, 2% to 5% by weight of a dispersing agent such as sodium ligosulfonate, about 1% by weight of polyethyleneglycol, and about 40% to 60% by weight of water.
A typical emulsifiable concentrate can be prepared by dissolving about 15% to 70% by weight of the active ingredient in about 85% to 30% by weight of a solvent such as isophorone, toluene, butyl cellosolve, methyl acetate, propylene glycol monomethyl ether, or the like and dispersing therein about 1% to 5% by weight of a nonionic surfactant such as an alkylphenoxy polyethoxy alcohol.
Some of the examples provided by way of illustration below utilize the schemes illustrated above and others provide a means for preparing other compounds of the invention which are not specifically described hereinabove. The invention is not to be deemed limited thereby except as defined in the claims.
EXAMPLE 1
Preparation of {{.alpha.-{[(Trifluoromethyl)sulfonyl]methylene}benzyl}amino}acetaldehyde diethyl acetal ##STR15##
A solution of phenylethynyl trifluoromethylsulfone (2.43 g, 0.0104 mol) in ether is cooled to 5.degree. C., treated with a solution of aminoacetaldehyde diethyl acetal (1.38 g, 0.0104 mol) in ether, stirred overnight at room temperature and concentrated in vacuo to obtain the title product as a red syrup (3.76 g) which is identified by NMR spectral analysis.
Following the above procedure, but substituting the appropriate substituted phenylethynyl trifluoromethylsulfone for phenylethynyl trifluoromethylsulfone yields the following compounds.
EXAMPLE 2
Preparation of 2-Phenyl-3-[(trifluoromethyl)sulfonyl]pyrrole ##STR17##
{{.alpha.-{[(Trifluoromethyl)sulfonyl]methylene}benzyl}amino}acetaldehyde diethyl acetal (3.3 g, 0.009 mol) is treated with trifluoroacetic acid (15 mL), stirred overnight at room temperature, concentrated in vacuo, and chased with ethyl acetate to obtain a brown oil. Flash chromatography of the oil using silica gel and a 1:4 ethyl acetate/hexanes solution gives a brown solid. The solid is triturated in hexanes, filtered and air dried to give the title product as a tan solid (1.65 g, mp 116.degree.-118.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but using the appropriately substituted {{.alpha.-{[(trifluoromethyl)sulfonyl]methylene}benzyl}amino}acetaldehyde diethyl acetal yields the following compounds.
EXAMPLE 3
Preparation of {{p-Methoxy-.alpha.-{[(trifluoromethyl]sulfonyl]methylene}benzyl}amino}ace taldehyde diethyl acetal ##STR19##
A solution of 4'-methoxy-2-[(trifluoromethyl)sulfonyl]acetophenone (6.0 g, 0.021 mol) in toluene is treated with aminoacetaldehyde diethyl acetal (2.8 g, 0.021 mol), heated at reflux overnight with removal of water, and concentrated in vacuo to obtain the title product as an oil. This oil is used in Example 4 without further purification.
EXAMPLE 4
Preparation of 2-(p-Methoxyphenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole ##STR20##
The oil obtained in Example 3 is treated with trifluoroacetic acid (20 mL), stirred for several hours at room temperature, concentrated in vacuo and chased with ethyl acetate to obtain an oil. Flash chromatography of the oil using silica gel and a 1:4 ethyl acetate/heptane solution gives a yellow semi-solid. Recrystallization of the semi-solid gives the title product as a yellow solid (0.88 g, mp 138.5.degree.-140.5.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 5
Preparation of 5-Bromo-2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole ##STR21##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole (1.0 g, 0.00323 mol) in chloroform is cooled, treated with a solution of bromine (0.52 g, 0.00323 mol) in chloroform, stirred at room temperature overnight, diluted with chloroform, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a dark syrup. Flash chromatography of the syrup using silical gel and a 1:5 ethyl acetate/hexanes solution gives the title product as an off-white solid (0.31 g, mp 73.degree.-76.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 6
Preparation of 5-Chloro-2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole ##STR22##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole (1.0 g, 0.00323 mol) in acetic acid is treated with thionyl chloride (0.43 g, 0.00323 mol), stirred for 30 minutes, poured into water and decanted to obtain a residue. The residue is dissolved in ethyl acetate and the organic solution is washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a dark syrup. Flash chromatography of the syrup using silica gel and a 1:5 ethyl acetate/hexanes solution gives the title product as a yellow solid (0.43 g, mp 109.degree.-112.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
Following the procedures of Examples 5 and 6, but substituting the appropriately substituted 2-phenyl-3-[(trifluoromethyl)sulfonyl]pyrrole for 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole and using one or two equivalents of halogenating reagent yields the following compounds.
EXAMPLE 7
Preparation of 5-(p-Chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole-2 -carbonitrile ##STR24##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole (0.9 g, 0.00291 mol) in acetonitrile is cooled, treated with chlorosulfonyl isocyanate (0.66 g, 0.00465 mol) under nitrogen, stirred overnight at room temperature, cooled, treated with dimethylformamide (1.06 g, 0.0145 mol), stirred at room temperature for five hours, poured into water and extracted with ether. The combined organic extracts are washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a dark syrup. Flash chromatography of the syrup using silica gel and a 1:3 ethyl acetate/hexanes solution gives a pale yellow syrup which is placed onto a silica gel plate and eluted with a 1:3 ethyl acetate/hexanes solution to give the title product as a waxy solid (mp 112.degree.-122.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 8
Preparation of 3-Bromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole-2-carbonit rile ##STR25##
A solution of 5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole-2-carbonitrile (0.87 g, 0.0026 mol) in dioxane is cooled, treated with bromine (0.46 g, 0.00286 mol), stirred at room temperature for two hours, treated with additional bromine (0.21 g, 0.0013 mol), stirred overnight at room temperature, poured into water and extracted with ethyl acetate. The combined organic extracts are washed with water, saturated sodium meta-bisulfite solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and a 1:4 ethyl acetate/hexanes solution gives the title product as a tan solid (0.27 g, mp 170.degree.-185.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 9
Preparation of 2,3-Dibromo-5-(p-chlorophenyl)-1-(ethoxymethyl)-4-[(trifluoromethyl)sulfon yl]pyrrole ##STR26##
A solution of potassium tert-butoxide (0.62 g, 0.0055 mol) in tetrahydrofuran is treated with 2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole (2.34 g, 0.005 mol), stirred for 15 minutes, treated with sodium iodide (0.82 g, 0.0055 mol), stirred for five minutes, treated with a solution of chloromethyl ethyl ether (0.52 g, 0.0055 mol) in tetrahydrofuran, stirred at room temperature for several hours, poured into water and extracted with ether. The combined organic extracts are washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to give an orange oil. The oil is slurried in hexane and filtered to obtain the title product as a pale yellow solid (1.95 g, mp 133.degree.-135.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
Following the above procedure, but substituting bromoacetonitrile for chloromethyl ethyl ether yields 2,3-dibromo-5-(p-chlorophenyl-4-[(trifluoromethyl)sulfonyl]pyrrole-1-aceto nitrile, mp 191.5.degree.-93.5.degree. C.
EXAMPLE 10
Preparation of N-(hydroxymethyl)acetamide ##STR27##
Acetamide (200 g, 3.4 mol) is added to a solution of potassium carbonate (20 g, 0,144 mol) in an aqueous formaldehyde solution (274 g, 37%, 3.4 mol). The reaction mixture is heated to 75.degree. C., stirred for 31/2 hours at room temperature, quenched with dry ice, diluted with acetone, dried with anhydrous sodium sulfate and filtered. The filtrate is dried with anhydrous sodium sulfate, filtered and concentrated in vacuo to give the title product as an oil (309 g) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 11
Preparation of N-(hydroxymethyl)acetamide acetate (ester) ##STR28##
Acetic anhydride (25 g) and pyridine (10 drops) is added to N-(hydroxymethyl)acetamide (9 g, 0.1 mol). The reaction mixture is stirred overnight at room temperature, concentrated in vacuo and chased with xylene to give the title product as an oil (11.9 g, 0.9 mol) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 12
Preparation of N-{{2,3-Dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrol-1-y l}methyl}acetamide ##STR29##
A mixture of sodium hydride (0.5 g, 60%, 0.0125 mol) and tetrahydrofuran is treated with 2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole (4.67 g, 0.01 mol), stirred for 15 minutes and treated with a solution of N-(hydroxymethyl)acetamide acetate (ester) (1.64 g, 0.0125 mol) in tetrahydrofuran. The reaction mixture is heated at reflux for 18 hours, concentrated in vacuo and poured into a water/ether mixture. The organic phase is separated, washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain the title product as a white solid (4.56 g).
EXAMPLE 13
Preparation of 2,3-Dibromo-1-(chloromethyl)-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfon yl]pyrrole ##STR30##
N-{{2,3-Dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrol-1-yl }methyl}acetamide (4.5 g, 0.00835 mol) is added t0 phosphoros oxychloride (15 mL). The reaction mixture is refluxed for 31/2 hours, poured into water, stirred overnight and filtered to obtain a solid. The solid is dissolved into methylene chloride and the solution is dried over anhydrous sodium sulfate and concentrated in vacuo to obtain the title product as a yellow solid (3.8 g, mp 53.degree.-156.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 14
Preparation of {2,3-Dibromo-5- (p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrol-1-yl}methyl dimethyldithiocarbamate ##STR31##
2,3-Dibromo-1-(chloromethyl)-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfony l]pyrrole (1.0 g, 0.00194 mol) is added to a mixture of sodium hydroxide (0,084 g, 0.0021 mol), sodium dimethyldithiocarbamate dihydrate (0.376 g, 0.0021 mol) and dimethylformamide. The reaction mixture is stirred for six hours at room temperature, poured into water and extracted with ethyl acetate. The combined organic extracts are washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a yellow gum. The gum is stirred with hexanes overnight and filtered to give the title product as a white solid (0.37 g, mp 185.degree.-187.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
Following the above procedure, but using p-chlorohippuric acid and p-toluic acid for sodium dimethyldithiocarbamate dihydrate yields {2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole-1-yl} methyl p-chlorohippurate, mp 74.degree.-78.degree. C. and {2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrol-1-yl}m ethyl p-toluate, mp 148.degree.-151.degree. C., respectively.
EXAMPLE 15
Preparation of 2-(p-Chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole ##STR32##
Trifluoromethylsulfenyl chloride is bubbled into a solution of 2-(p-chlorophenyl)pyrrole (0.5 g, 0.00281 mol) and sodium carbonate (0.36 g, 0.00338 mol) in ether at -30.degree. C. under nitrogen. The reaction mixture is stirred for 1/2 hour and diluted with a water/ether mixture. The organic phase is separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title product as a purple solid (0.78 g, mp 34.degree.-39.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but substituting difluoromethylsulfenyl chloride for trifluoromethylsulfenyl chloride yields 2-(p-chlorophenyl)-5-[(difluoromethyl)thio]pyrrole, mp 42.degree.-46.degree. C.
EXAMPLE 16
Preparation of 3-Bromo-2-(p-chlorophenyl]-5-[(trifluoromethyl)thio]pyrrole ##STR33##
A solution of 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (1.94 g, 0.00699 mol) in chloroform is cooled, treated with a solution of bromine (1.16 g, 0.00699 mol) in chloroform, stirred for two hours, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a dark syrup. Flash chromatography of the syrup using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a pink syrup (2.0 g) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but using the appropriately substituted 2-(p-chlorophenyl-5-(substituted methyl)thio]pyrrole and two equivalents of bromine yields 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole, mp 105.degree.-107.degree. C. and 3,4-dibromo-2-(p-chlorophenyl)-5-[(difluoromethyl)thio]pyrrole, mp 82.degree.-92.degree. C.
EXAMPLE 17
Preparation of 3-Bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfinyl]pyrrole ##STR34##
A solution of 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (0.65 g, 0.00182 mol) in chloroform is cooled with an ice-water bath, treated with a solution of 3-chloroperoxybenzoic acid (0.52 g, 60% pure, 0.00182 mol) in chloroform, stirred for two hours, treated with saturated sodium metabisulfite solution, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a white solid. Flash chromatography of the solid using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a white solid (0.34 g, mp 177.degree.-179.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
Following the above procedure, but using 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole for 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole yields 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfinyl]pyrrole, mp 173.degree.-176.degree. C.
EXAMPLE 18
Preparation of 3-Bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfonyl]pyrrole ##STR35##
A solution of 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (0.70 g, 0.00196 mol) in chloroform is cooled with an ice-water bath, treated with a solution of 3-chloroperoxybenzoic acid (1.3 g, 60% pure, 0.0045 mol) in chloroform, stirred for two hours, warmed to room temperature, stirred overnight, treated with saturated sodium metabisulfite solution, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a white solid. Flash chromatography of the solid using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a white solid (0.48 g, mp 155.degree.-159.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
Following the above procedure, but substituting 3,4-dibromo-2-(p-chlorophenyl)-5-[(difluoromethyl)thio]pyrrole for 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfonyl]pyrrole yields 3,4-dibromo-2-(p-chlorophenyl)-5-[(difluoromethyl)sulfonyl]pyrrole, mp 194.degree.-196.degree. C. (dec).
EXAMPLE 19
Preparation of 3,4-Dibromo-2-(p-chlorophenyl]-5-[(trifluoromethyl)sulfonyl]pyrrole ##STR36##
A solution of 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (0.9 g, 0.00207 mol) in tetrahydrofuran is cooled with an ice-water bath, treated with a solution of monoperoxyphthalic acid, magnesium salt hexahydrate (1.4 g, 80% pure, 0.00227 mol) in tetrahydrofuran, stirred overnight at room temperature, treated with saturated sodium metabisulfite solution, diluted with ethyl acetate, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow residue. Flash chromatography of the residue using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a white solid (0.21 g, mp 165.degree.-168.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
EXAMPLE 20
Preparation of 3-(p-Chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole ##STR37##
A mixture of sodium hydride (0.31 g, 60%, 0.0077 mol) and ether is treated dropwise with a solution of p-chlorostyryl trifluoromethylsulfone (1.73 g, 0.0064 mol), N-methylene-1-(p-tolylsulfonyl)methylamine (1.25 g, 0.0064 mol), ether (20 mL) and dimethylsulfoxide (10 mL) with stirring under nitrogen. The reaction mixture is stirred for one hour, diluted with water and extracted with ether. The combined organic extracts are washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and a 1:2 ethyl acetate/hexanes solution gives the title product as a white solid (1.4 g, mp 138.degree.-141.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 21
Preparation of 2-Bromo-3-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole ##STR38##
A solution of 2-bromo-3-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole (0.5 g, 0.00161 mol) in chloroform is cooled with an ice-water bath, treated with a solution of bromine (0.258 g, 0.00161 mol) in chloroform, stirred for several hours, diluted with methylene chloride, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a white solid. Flash chromatography of the solid using silica gel and a 1:3 ethyl acetate/hexanes solution gives the title product as a white solid (0.54 g, mp 163.degree.-165.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but using two equivalents of bromine yields 2,5-dibromo-3-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole, mp 224.degree.-226.degree. C.
EXAMPLE 22
Preparation of 2-(p-Chlorophenyl)-3-nitro-5-[(trifluoromethyl)thio]pyrrole and 5-(p-Chlorophenyl)-3-nitro-2-[(trifluoromethyl)thio]pyrrole ##STR39##
A solution of 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (1.0 g, 0.0036 mol) in acetic acid is cooled with an ice bath, treated with nitric acid (0.24 g, 0.00378 mol), stirred for two hours, poured into ice-water and stirred for one hour. The aqueous solution is filtered and the filter cake is washed with water and dried in a vacuum dessicator to obtain a tan solid. Flash chromatography of the solid using silica gel and a 1:10 ethyl acetate/hexanes solution gives 2-(p-chlorophenyl)-3-nitro-5-[(trifluoromethyl)thio]pyrrole as a yellow solid (0.45 g, mp 143.degree.-145.degree. C.) and 5-(p-chlorophenyl)-3-nitro-2-[(trifluoromethyl)thio]pyrrole as a yellow solid (0.17 g, mp 185.degree.-193.degree. C.). Both products are identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 23
Preparation of 3 -Bromo-5-(p-chlorophenyl)-4-nitro-2-[(trifluoromethyl)thio]pyrrole ##STR40##
A solution of 2-(p-chlorophenyl)-3-nitro-5-[(trifluoromethyl)thio]pyrrole (0.35 g, 0.0011 mol) and sodium acetate (0.11 g, 0.0013 mol) in acetic acid is treated with a solution of bromine (0.21 g, 0.0013 mol) in acetic acid, stirred for one hour, poured into water and extracted with ethyl acetate. The combined organic extracts are washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a residue. Flash chromatography of the residue using silica gel and a 1:9 ethyl acetate/hexanes solution gives the title product as a yellow solid (0.25 g, mp 160.degree.-165.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 24
Preparation of 2-(p-Chlorophenyl)-3-nitro-5-[(trifluoromethyl)sulfonyl]pyrrole ##STR41##
A solution of 2-(p-chlorophenyl)-3-nitro-5-[(trifluoromethyl)thio]pyrrole (0.24 g, 0.000744 mol) in chloroform is cooled with an ice bath, treated with 3-chloroperoxybenzoic acid (0.49 g, 60%, 0.00171 mol) and stirred for one hour. The cooling bath is removed and the reaction mixture is stirred for one hour, treated with saturated sodium bisulfite solution, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and 1:3 ethyl acetate/hexanes solution gives the title product as a yellow solid (0.26 g, mp 97.degree.-99.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
EXAMPLE 25
Preparation of 2-(p-Chlorophenyl)-5-nitro-3-[(trifluoromethyl)sulfonyl]pyrrole ##STR42##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole (1.0 g, 0.00323 mol) in acetic anhydride is cooled with an ice bath, treated with nitric acid (0.15 mL, 0.00329 mol), warmed to room temperature, stirred for 20 hours and poured into water. The mixture is decanted and the insolubles are dissolved in ethyl acetate. The ethyl acetate solution is washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain an amber residue. Flash chromatography of the residue using silica gel and a 1:1 ethyl acetate/hexanes solution gives the title product as a tan solid (0.43 g, mp 174.degree.-180.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 26
Preparation of 5-(p-Chlorophenyl)pyrrol-5-yl trichloromethyl ketone ##STR43##
A solution of trichloroacetyl chloride (11.26 g, 0.0619 mol) in ether is treated with a solution of 2-(p-chlorophenyl)pyrrole (10.0 g, 0.0503 mol) in ether, stirred for four hours at room temperature, treated with saturated potassium carbonate solution and diluted with ethyl acetate. The organic phase is separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow solid. The solid is recrystallized from 2-propanol to give the title product as a yellow solid (12.63 g, mp 166.degree.-168.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 27
Preparation of Methyl 5-(p-chlorophenyl)pyrrole-2-carboxylate ##STR44##
A solution of sodium methoxide (12.73 mL of 4.38M solution in methanol, 0.0556 mol) in methanol is cooled with an ice bath, treated with 5-(p-chlorophenyl)pyrrol-5-yl trichloromethyl ketone (6.0 g, 0.0186 mol), stirred for two hours, diluted with water and filtered to obtain a solid. The solid is washed with water and dried overnight in a vacuum dessicator to give the title product as a tan solid (4.23 g, mp 177.degree.-179.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
Following the above procedure, but substituting sodium ethoxide and ethanol for sodium methoxide and methanol yields ethyl 5-(p-chlorophenyl)pyrrole-2-carboxylate, mp 148.degree.-150.5.degree. C.
EXAMPLE 28
Preparation of Methyl 5-(p-chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole-2 -carboxylate ##STR45##
Trifluoromethanesulfonic acid (0.27 g, 0.001795 mol) is added to a solution of methyl 5-(p-chlorophenyl)pyrrole-2-carboxylate (4.23 g, 0.01795 mol) in methylene chloride (70 mL) at -30.degree. C. This mixture is treated with trifluoromethylsulfenyl chloride (4.0 g, 0.0293 mol), stirred for 30 minutes at -15.degree. C., warmed to room temperature with stirring for three hours, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain the title product as an off-white solid (5.44 g, mp 133.degree.-137.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 29
Preparation of 5-(p-Chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole-2-carboxylic acid ##STR46##
A mixture of methyl 5-(p-chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole-2-carboxylate (4.89 g, 0.0146 mol) and sodium hydroxide (1.75 g, 0.0437 mol) in a 2:1 methanol/water solution (150 mL) is warmed to 60.degree. C., stirred for three hours, cooled to room temperature with stirring overnight and concentrated in vacuo to remove most of the methanol. The resulting aqueous solution is treated with 10% hydrochloric acid and a white precipitate forms. Ethyl acetate is added and the organic phase is separated, washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title product as an off-white solid (4.98 g, mp 176.degree.-178.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 30
Preparation of 2-(p-Chlorophenyl)-3-[(trifluoromethyl)thio]pyrrole ##STR47##
A mixture of 5-(p-chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole-2-carboxylic acid (0.5 g, 0.00155 mol) in ethanolamine (1.5 mL) is stirred at 160.degree. C. for five hours, cooled to room temperature overnight with stirring, poured into water and. extracted with ether. The combined organic extracts are washed with brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and a 1:4 ethyl acetate/hexanes solution gives the title product as an off-white solid (0.11 g, mp 59.degree.-64.degree. C.) which is identified by .sup.1 HNMR and .sup.19 FNMR spectral analyses.
EXAMPLE 31
Preparation of 2,3-Dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole ##STR48##
A solution of 5-(p-chlorophenyl)-4-[(trifluoromethyl)thio]pyrrole-2-carboxylic acid (0.75 g, 0.00233 mol) and sodium acetate (0.84 g, 0.0103 mol) in acetic acid (15 mL) is treated dropwise with a solution of bromine (0.82 g, 0.00513 mol) in acetic acid (7.5 mL), stirred for two hours, diluted with water and extracted with ether. The combined organic extracts are washed with water, saturated metabisulfite solution, saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a tan solid (0.52 g, mp 107.degree.-113.degree. C.) which is identified by .sup.1 HNMR, .sup.13 CNMR and .sup.19 FNMR spectral analyses.
EXAMPLE 32
Preparation of Ethyl 4-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carboxylate ##STR49##
A solution of ethyl 4-(p-chlorophenyl)-pyrrole-3-carboxylate (9.0 g, 0,036 mol) in methylene chloride (180 mL) is treated with trifluoromethylsulfenyl chloride (4.9 g, 0.036 mol) with stirring for 45 minutes at -30.degree. C. The reaction mixture is warmed to room temperature and stirred for several hours. Since a TLC shows some starting material present, the reaction mixture is cooled to -30.degree. C., treated with additional trifluoromethylsulfenyl chloride (1.3 g, 0.0095 mol), warmed to room temperature overnight with stirring, washed with water, saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title product as an off-white solid (12.0 g, mp 161.5.degree.-164.0.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 33
Preparation of 3-(p-Chlorophenyl)-2-[(trifluoromethyl)thio]pyrrole ##STR50##
A solution of ethyl 4-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carboxylate (8.0 g, 0.023 mol) in 10% aqeuous sodium hydroxide solution is refluxed for several hours, stirred at room temperature overnight, poured into ice-water, treated with concentrated hydrochloric acid and extracted with ether. The combined organic extracts are washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a brown semi-solid. A solution of the semi-solid (6.9 g) in ethanolamine is heated at 110.degree. C. for several hours, poured into ice-water and extracted with chloroform. The combined organic extracts are washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give a brown oil. The oil is dissolved in methylene chloride, filtered through a bed of silica gel and the filtrate is concentrated in vacuo to obtain the title product as a grey semi-solid (4.8 g, mp 44.degree.-46.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 34
Preparation of 2,3-Dibromo-4-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole ##STR51##
A solution of 3-(p-chlorophenyl)-2-[(trifluoromethyl)thio]pyrrole (3.0 g, 0.0108 mol) in methylene chloride (15 mL) is treated with bromine (4.0 g, 0.025 mol, 1.3 mL), stirred for one hour, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to give the title product as a purple semi-solid (4.2 g) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 35
Preparation of 2,3-Dibromo-4-(p-chlorophenyl)-5-[(trifluoromethyl)sulfinyl]pyrrole ##STR52##
A solution of 2,3-dibromo-4-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole (1.0 g, 0.0023 mol) in chloroform (10 mL) is treated with 3-chloroperoxybenzoic acid (0.4 g, 60%, 0.0023 mol) with stirring at 0.degree. C., warmed to room temperature with stirring for two hours, washed with saturated sodium metabisulfite solution, saturated sodium hydrogen carbonate solution, water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a yellow syrup. Flash chromatography of the syrup using silica gel and a 1:4 ethyl acetate/hexanes solution gives the title product as a yellow solid (0.4 g, mp 165.5.degree.-167.5.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 36
Preparation of 2- (p-Chlorophenyl) -3-[(trifluoromethyl)sulfonyl]-5-[(trifluoromethyl)thio]pyrrole ##STR53##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]pyrrole (2.47 g, 0.0080 mol), trifluoromethylsulfenyl chloride (2,18 g, 0,016 mol), trifluoromethanesulfonic acid (0.12 g, 0.0008 mol) and 1,2-dichloroethane (15 mL) is placed in a pressure tube, heated at 70.degree. C. for five days, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain an amber syrup. Flash chromatography of the syrup using silica gel and a 1:5 ethyl acetate/hexanes solution gives the title product as an off-white solid (2.36 g, mp 118.degree.-122.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 37
Preparation of 3,5-Bis[(trifluoromethyl)sulfonyl]-2-(p-chlorophenyl)pyrrole ##STR54##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]-5-[(trifluoromethyl)thio] pyrrole (0.5 g, 0.00122 mol) in chloroform (20 mL) is cooled with an ice bath, treated with 3-chloroperoxybenzoic acid (0.81 g, 60% pure, 0.00281 mol), stirred for four hours, warmed to room temperature and stirred overnight. The reaction mixture is diluted with methylene chloride, washed sequentially with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. Flash chromatography of the solid using silica gel and a 2:1 ethyl acetate/hexanes solution gives a solid which is recrystallized from carbon tetrachloride to obtain the title product as a white solid (0.23 g, mp 142.degree.-144.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 38
Preparation of 3-Bromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]-2-[(trifluorometh yl)thio]pyrrole ##STR55##
A solution of 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]-5-[(trifluoromethyl)thio] pyrrole (0.5 g, 0.00122 mol) in chloroform (10 mL) is cooled with an ice bath, treated with a solution of bromine (0.21 g, 0.00134 mol) in chloroform (5 mL), stirred for two hours, warmed to room temperature, treated with two drops of additional bromine and stirred for one hour. The reaction mixture is diluted with methylene chloride, washed with water, saturated sodium hydrogen carbonate solution, saturated sodium metabisulfite solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a syrup. Flash chromatography of the syrup using silica gel and a 1:5 ethyl acetate/hexanes solution gives the title product as a white solid (0.25 g, mp 122.degree.-125.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 39
Preparation of 3-Bromo-5-(p-chlorophenyl)-2-[(trifluoromethyl)sulfinyl]-4-[(trifluorometh yl)sulfonyl]pyrrole ##STR56##
A solution of 3-bromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]-2-[(trifluorometh yl)thio]pyrrole (0.4 g, 0.00082 mol) in chloroform (5 mL) is cooled with an ice bath, treated with a solution of 3-chloroperoxybenzoic acid (0.24 g, 60%, 0.00082 mol) in chloroform (10 mL), stirred for two hours, warmed to room temperature and stirred overnight. The reaction mixture is treated with saturated sodium metabisulfite solution, diluted with methylene chloride, washed with saturated sodium hydrogen carbonate solution and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a residue. The residue is placed on a prep plate and eluted with a 1:2 ethyl acetate/hexanes solution to give the title product as a white solid (0.25 g, mp 120.degree.-170.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
Following the above procedure, but using at least two equivalents of 3-chloroperoxybenzoic acid yields 2,4-bis[(trifluoromethyl)sulfonyl]-3-bromo-5-(p-chlorophenyl)pyrrole, mp 115.degree.-135.degree. C.
EXAMPLE 40
Preparation of Ethyl 5-(p-chlorophenyl)-4-thiocyanatopyrrole-2-carboxylate ##STR57##
A solution of ethyl 5-(p-chlorophenyl)pyrrole-2-carboxylate (0.95 g, 3.8 mmol) in acetic acid (20 mL) is treated with ammonium thiocyanate (1.75 g, 22.8 mmol), stirred at room temperature for five minutes, cooled to 15.degree. C., treated with a solution of bromine (0.91 g, 5.7 mmol) in acetic acid (10 mL) and stirred at room temperature for several hours. The reaction mixture is filtered to remove solids and the filtrate is poured into water and stirred. The aqueous mixture is filtered to obtain an off-white solid. Flash chromatography of the solid using a 1:10 ethyl acetate/hexanes solution gives the title product as a white solid (0.99 g, mp 138.degree.-141.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 41
Preparation of Ethyl 5-(p-chlorophenyl)-4-[(difluoromethyl)thio]pyrrole-2-carboxylate ##STR58##
A solution of ethyl 5-(p-chlorophenyl)-4-thiocyanatopyrrole-2-carboxylate (76.7 mg, 0.25 mmol) in 2-propanol is treated with sodium borohydride (11.0 mg, 0.29 mmol) under nitrogen, heated to 70.degree. C. for ten minutes, cooled to room temperature, treated with a solution of potassium hydroxide (16.8 mg, 0.30 mmol) in 2-propanol, treated with tributylphosphine (81.2 mg, 0.4 mmol), heated to 65.degree.-70.degree. C. and treated with excess chlorodifluoromethane for one hour. Additional tributylphosphine (81.2 mg, 0.4 mmol) is added to the reaction mixture and the addition of chlorodifluoromethane is continued for 30 minutes. The mixture is then poured into brine and extracted with ethyl acetate. The combined organic extracts are washed with water, dried over anhydrous soidum sulfate and concentrated in vacuo to obtain a liquid. Flash chromatography of the liquid using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a white solid (42.6 mg, mp 113.degree.-117.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but substituting tetrafluoroethylene for chlorodifluoromethane yields ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)thio]pyrrole-2-carboxylate
EXAMPLE 42
Preparation of 5-(p-Chlorophenyl)-4-[(difluoromethyl)thio]pyrrole-2-carboxylic acid ##STR59##
A solution of ethyl 5-(p-chlorophenyl)-4-[(difluoromethyl)thio]pyrrole-2-carboxylate (166 mg, 0.5 mmol) in ethanol is treated under nitrogen with a solution of sodium hydroxide (100 mg, 2.5 mmol) in water. The reaction mixture is refluxed for three hours, poured into ice-water, treated with hydrochloric acid and extracted with ethyl acetate. The combined organic extracts are washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain the title product as an orange solid (158 mg, mp 165.degree. C. (dec)) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 43
Preparation of 2,3-Dibromo-5-(p-chlorophenyl)-4-[(difluoromethyl)thio]pyrrole ##STR60##
A solution of 5-(p-chlorophenyl)-4-[(difluoromethyl)thio]pyrrole-2-carboxylic acid (5.39 g, 0.0178 mol) and sodium acetate (6.4 g, 0.0781 mol) in acetic acid is treated with a solution of bromine (6.24 g, 0.039 mol) in acetic acid under nitrogen. The reaction mixture is stirred for three hours at room temperature, poured into ice-water and extracted with ethyl acetate. The combined organic extracts are washed with water, saturated sodium hydrogen carbonate solution and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a red gum. A mixture of the gum, ethyl acetate and silica gel is evaporated to dryness and placed on a column packed with silica gel. The column is eluted with a 1:10 ethyl acetate/hexanes solution to obtain a gum. The gum is dissolved in ethyl acetate, treated with carbon black, filtered through celite and concentrated in vacuo to obtain an orange gum. The orange gum is dissolved in an ether/pentane solution, cooled to 0.degree. C. and filtered to remove solids. After the filtrate is concentrated in vacuo, the residue is dissolved in acetone, treated with carbon black, filtered through celite and concentrated in vacuo to give the title product as a red gum (4.33 g) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 44
Preparation of 2,3-Dibromno-5-(p-chlorophenyl)-4-[(difluoromethyl)sulfinyl]pyrrole ##STR61##
A solution of 2,3-dibromo-5-(p-chlorophenyl-4-[(difluoromethyl)thio]pyrrole (125 mg, 0.030 mmol) in chloroform is treated with 3-chloroperoxybenzoic acid (86 mg, 60%, 0.30 mmol) at 0.degree. C. The reaction mixture is stirred for one hour at O.degree. C., warmed to room temperature, stirred overnight, poured into saturated sodium metabisulfite solution and diluted with a methylene chloride/water mixture. The organic phase is separated, washed with saturated sodium hydrogen carbonate solution, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a residue. Flash chromatography of the residue using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as a yellow solid (68 mg, mp 180.degree. C. (dec)) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 45
Preparation of 2-(p-Chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)thio]pyrrole ##STR62##
A solution of 2-(p-chlorophenyl)-5-(trifluoromethyl)pyrrole (11.2 g, 45.7 mmol) in methylene chloride is treated with an excess of trifluoromethylsulfenyl chloride, stirred overnight at room temperature, treated with trifluoromethanesulfonic acid (40 drops) and additional trifluoromethylsulfenyl chloride, stirred for 30 minutes and diluted with an ether/water mixture. The organic phase is separated, washed with water, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a purple oil. Flash chromatography of the oil using silica gel and a 1:9 ethyl acetate/hexanes solution gives a blue oil which is crystallized from petroleum ether to obtain the title product as a purple solid(mp 53.0.degree.-55.0.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 46
Preparation of 3-Bromo-5-(p-chlorophenyl)-2-(trifluoromethyl)-4-[(trifluoromethyl)thio]py rrole ##STR63##
A solution of 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)thio]pyrrole (1.03 g, 3.0 mmol) and sodium acetate (0.3 g, 3.6 mmol) in acetic acid is treated with bromine (0.58 g, 3.6 mmol), stirred for 30 minutes at room temperature and diluted with an ethyl acetate/water mixture. The organic phase is separated, washed with water, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a semi-solid. Chromatography of the semi-solid using silica gel and hexanes gives the title product as a white solid (mp 87.0.degree.-88.5.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 47
Preparation of 2-(p-Chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfinyl]pyrrol e ##STR64##
A solution of 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)thio]pyrrole (5.5 g, 15.9 mmol) in chloroform is cooled to 0.degree. C., treated with 3-chloroperoxybenzoic acid (5.49 g, 60%, 19.1 mmol), stirred for several hours and filtered to remove solids. The solids are dissolved into ether and the organic solution is washed with water and saturated sodium hydrogen carbonate solution, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. Recrystallization of the solid from ether gives the title product as a white solid (mp 198.degree.-200.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 48
Preparation of 2-(p-Chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfonyl]pyrrol e ##STR65##
A solution of 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)thio]pyrrole (1.5 g, 4.3 mmol) in acetic acid is treated with hydrogen peroxide (1.5 mL, 30%, 13 mmol), stirred at 95.degree. C. for several hours, treated with additional hydrogen peroxide (1 mL), stirred at 90.degree. C. for four hours, cooled to room temperature, stirred for 48 hours, treated with additional hydrogen peroxide (1 mL), stirred for several hours at reflux, cooled and diluted with an ethyl acetate/water mixture. The organic phase is separated, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain an oil. Crystallization of the oil from petroleum ether gives a white semi-solid which is chromatographed using silica gel and a 1:9 ethyl acetate/hexanes solution to obtain the title product as a white solid (mp 167.degree.-169.degree. C.) which is identified by .sup.1 HNMR, .sup.19 FNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 49
Preparation of 3-Bromo-5-(p-chlorophenyl)-1-(ethoxymethyl)-2-(trifluoromethyl)-4-[(triflu oromethyl)thio]pyrrole ##STR66##
A solution of 3-bromo-5-(p-chlorophenyl)-2-(trifluoromethyl)-4-[(trifluoromethyl)thio]py rrole (0.6 g, 1.4 mmol) and potassium tert-butoxide (0.19 g, 1.7 mmol) in tetrahydrofuran is stirred for 15 minutes, treated with chloromethyl ethyl ether (0.16 g, 1.7 mmol), stirred for 30 minutes and diluted with an ether/water mixture. The organic phase is separated, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a residue. Chromatography of the residue using silica gel and a 1:9 ethyl acetate/hexanes solution gives the title product as an amber oil which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
Following the above procedure, but substituting 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfinyl]pyrrol e for 3-bromo-5-(p-chlorophenyl)-2-(trifluoromethyl)-4-[(trifluoromethyl)thio]py rrole yields 2-(p-chlorophenyl)-1-(ethoxymethyl)-5-(trifluoromethyl)-3-[(trifluoromethy l)sulfinyl]pyrrole as an oil.
EXAMPLE 50
Preparation of 2-(p-Chlorophenyl)-4-phenyl-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfon yl]pyrrole ##STR67##
A solution of 4-(p-chlorophenyl)-2-(trifluoromethyl)-3-oxazolin-5-one (1.0 g, 3.8 mmol) and .beta.,.beta.-bis[(trifluoromethyl)sulfonyl]styrene (1.4 g, 3.8 mmol) in dimethylformamide is stirred for two hours at 110.degree. C., treated with triethylamine (0.38 g, 3.8 mmol), stirred for several hours at reflux and diluted with an ethyl acetate/water mixture. The organic phase is separated, washed with water and dilute hydrochloric acid, dried over anhudrous magnesium sulfate and concentrated in vacuo to obtain a residue. Chromatography of the residue using silica gel and a 1:10 ethyl acetate/hexanes solution gives the title product as an amber oil which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 51
Preparation of Trifluoromethyl 1-chloro-N-(p-chlorobenzyl)thioformimidate ##STR68##
Trifluoromethylsulfenyl chloride (4.0 g, 0.03 mol) is bubbled over 30 minutes into a solution of 4-chlorobenzylisonitrile (3.0 g, 0.02 mol) in methylene chloride, causing the formation of a white precipitate. The suspension is stirred for 16 hours at room temperature and filtered to remove solids. The white filter cake is washed with methylene chloride and solvent is removed under reduced pressure to obtain an amber oil. Bulb-to-bulb distillation of the oil (90.degree.-100.degree. C., 0.05 mmHg) gives the title product as a colorless oil (3.9 g, 68%).
EXAMPLE 52
Preparation of 2-(p-Chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile ##STR69##
Under a nitrogen purge, a solution of trifluoromethyl-1-chloro-N-(p-chlorobenzyl)thioformimidate (1.1 g, 0.004 mol) and 2-chloroacrylonitrile (0.4 mL, 0.005 mol) is treated with a solution of triethylamine (1.3 mL, 0.009 mol) in toluene. After an induction period, solids begin to form as the reaction mixture exotherms slightly. When the exotherm subsides, the reaction mixture is heated at reflux temperature for 16 hours, cooled and filtered. The filter cake is washed with ehtyl acetate and the filtrate is concentrated in vacuo to obtain a semi-solid. The semi-solid is dissolved in ethyl acetate and the organic solution is washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. The solid is twice recrystallized from 1,2-dichloroethane to give the title product as a beige solid (0.7 g, mp 203.degree.-205.degree. C.) which is identified by .sup.1 HNMR spectral analysis.
EXAMPLE 53
Preparation of 2-(p-Chlorophenyl)-5-[(trifluoromethyl)sulfonyl]pyrrole-3-carbonitrile ##STR70##
A solution of 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile (0.6 g, 0.002 mol) in acetic acid is treated portionwise with 30% hydrogen peroxide solution (0.6 mL, 0.006 mol), stirred for 11/2 hours at 90.degree. C., treated with additional hydrogen peroxide (0.3 mL, 0.003 mol), stirred for two hours at 90.degree. C. stirred for 16 hours at room temperature and diluted with an ethyl acetate/water mixture. The organic phase is separated, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. The solid is recrystallized from ethylene dichloride to give the title product as a beige solid (mp 228.degree.-230.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 54
Preparation of 4-Bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile ##STR71##
Under a nitrogen purge, a solution of 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile (0.6 g, 0.002 mol) in tetrahydrofuran is treated with N-bromosuccinimide (0.36 g, 0,002 mol), stirred for 16 hours at room temperature and concentrated in vacuo to obtain a residue. The residue is dissolved in ether and diluted with water. The organic phase is separated, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. High performance liquid chromatography indicates that the solid contains 20% starting material. A solution of the mixture and sodium acetate (0.05 g, 0.006 mol) in acetic acid is treated with bromine (0.03 mL, 0.0006 mol), stirred for 16 hours at 60.degree. C., cooled and concentrated in vacuo to obtain a semi-solid. The semi-solid is partitioned between ethyl acetate and water. The organic phase is separated, washed with water and brine, dried over anhydrous magnesium sulfate and concentrated in vacuo to obtain a solid. The solid is recrystallized from ethylene dichloride to give the title product as an off-white solid (mp 241.degree.-243.degree. C.) which is identified by .sup. 1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 55
Preparation of 3-(p-chlorophenyl)-1-methyl-4-[(trifluoromethyl)sulfonyl]pyrrole ##STR72##
A solution of 2-(p-chlorophenyl)ethynyl trifluoromethylsulfone (4.8 g, 0.018 mol) and N-formylsarcosine (2.9 g, 0,025 mol) in acetic anhydride is stirred for three hours at reflux temperature, stirred overnight at room temperature, concentrated in vacuo, diluted with water and extracted with ether. The combined organic extracts are concentrated in vacuo to obtain a residue. Flash chromatography of the residue using silica gel and a 1:3 ethyl acetate/hexanes solution gives a brown solid which is recrystallized from a benzene/hexanes solution to obtain the title product as a white solid (1.9 g, mp 70.degree.-73.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 56
Preparation of 2-Chloro-3-(p-chlorophenyl)-1-methyl-4-[(trifluoromethyl)sulfonyl]pyrrole ##STR73##
A solution of 3-(p-chlorophenyl)-1-methyl-4-[(trifluoromethyl)sulfonyl]pyrrole (0.5 g, 0.0015 mol) in dimethoxyethane is treated with chlorosulfonyl isocyanate (0.3 mL, 0.0034 mol), stirred for 24 hours at room temperature, treated with additional chlorosulfonyl isocyanate (0.6 mL, 0.0068 mol), stirred for 24 hours, treated with dimethylformamide (2 mL), stirred for one hour, diluted with water and extracted with ether. The combined organic extractes are washed with water, dried and concentrated in vacuo to obtain a semi-solid. Flash chromatography of the semi-solid using silica gel and a 1:4 ethyl acetate/hexanes solution gives the title product as a white solid (0.2 g, mp 117.degree.-119.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 57
Preparation of Ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrrole-2-carboxy late and Ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfinyl]pyrrole-2 -carboxylate ##STR74##
A solution of ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)thio]pyrrole-2-carboxylate (1.83 g, 0.0022 mol) in chloroform is cooled with an ice bath, treated with 3-chloroperoxybenzoic acid (3.2 g, 0.011 mol), stirred for one hour, warmed to room temperature, stirred for several hours, cooled with an ice bath, treated with additional 3-chloroperoxybenzoic acid (2.7 g, 60%, 0.009 mol), stirred for several hours, treated with saturated sodium metabisulfite solution and diluted with a methylene chloride/water mixture. The organic phase is separated, washed with saturated sodium hydrogen carbonate solution, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a residue. Flash chromatography of the residue using silica gel and a 1:5 ethyl acetate/hexanes solution gives ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrrole-2-carboxy late as a white solid (0.54 g, 153.degree.-156.degree. C.) and ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfinyl]pyrrole-2-carboxy late as a white solid (1.28 g, mp 138.degree.-140.degree. C.). Both products are identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 58
Preparation of 5-(p-Chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrrole-2-carboxy lic acid ##STR75##
A solution of ethyl 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrrole-2-carboxy late (0.54 g, 0.0012 mol) in ethanol is treated under nitrogen with a solution of sodium hydroxide (0.26 g, 0.0065 mol) in water. The reaction mixture is refluxed for three hours, poured into ice-water, treated with hydrochloric acid and extracted with ethyl acetate. The combined organic extracts are washed with water and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain the title product as a gum (0.6 g).
EXAMPLE 59
Preparation of 2,3-Dibromo-5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrro le ##STR76##
A solution of 5-(p-chlorophenyl)-4-[(1,1,2,2-tetrafluoroethyl)sulfonyl]pyrrole-2-carboxy lic acid (0.5 g, 0.0013 mol) and Sodium acetate (0.47 g, 0.0057 mol) in acetic acid-is treated with a solution of bromine (0.46 g, 0.0029 mol) in acetic acid, stirred for two hours at 60.degree. C., poured into ice-water and extracted with ethyl acetate. The combined organic extracts are washed with water, saturated sodium hydrogen carbonate solution and brine, dried over anhydrous sodium sulfate and concentrated in vacuo to obtain a red gum. Flash chromatography of the gum using silica gel and a 1:6 ethyl acetate/hexanes solution gives the title product as a pale green solid (0.37 g, mp 138.degree.-141.degree. C.) which is identified by .sup.1 HNMR and .sup.13 CNMR spectral analyses.
EXAMPLE 60
Insecticide and Acaricide Evaluations
The following tests show the efficacy of the compounds as insecticides and acarides. The evaluations are conducted with solutions of test compounds dissolved or dispersed in 50/50 acetone/water mixtures. The test compound is technical material dissolved or dispersed in said acetone/water mixtures in sufficient amount to provide the concentrations set forth in Table I below.
All concentrations reported herein are in terms of active ingredient. All tests are conducted in a laboratory maintained at about 27.degree. C. The rating system employed is as follows:
The test species of insects used in the present evaluations along with specific test procedures are described below.
Spodoptera eridania 3rd instar larvae, southern armyworm
A sieva lima bean leaf expanded to 7 to 8 cm in length is dipped in the test suspension with agitation for 3 seconds and placed in a hood to dry. The leaf is then placed in a 100.times.10 mm petri dish containing a damp filter paper on the bottom and 10 3rd instar caterpillars. The dish is maintained for 5 days before observations are made of mortality, reduced feeding, or any interference with normal moulting.
Spodoptera eridania 7-day residual
The plants treated in the above test are maintained under high intensity lamps in the greenhouse for 7 days. These lamps duplicate the effects of a bright sunny day and are kept on for 14 hour day length. After 7 days, the foliage is sampled and assayed as in the above-said test.
Tetranychus urticae (P-resistant strain), 2-spotted spider mite
Sieva lima bean plants with primary leaves expanded to 7 to 8 cm are selected and cut back to one plant per pot. A small piece is cut from a leaf taken from the main colony and placed on each leaf of the test plants. This is done about 2 hours before treatment to allow the mites to move over to the test plant and to lay eggs. The size of the cut piece is varied to obtain about 100 mites per leaf. At the time of the treatment, the piece of leaf used to transfer the mites is removed and discarded. The mite-infested plants are dipped in the test formulation for 3 seconds with agitation and set in the hood to dry. Plants are kept for 2 days before estimates of adult kill are made using the first leaf. The second leaf is kept on the plants for another 5 days before observations are made of the kill of eggs and/or newly emerged nymphs.
Empoasca abrupta, adults, western potato leafhopper
A Sieva lima bean leaf about 5 cm long is dipped in the test formulation for 3 seconds with agitation and placed in a hood to dry. The leaf is placed in a 100.times.10 mm petri dish containing a moist filter paper on the bottom. About 10 adult leafhoppers are added to each dish and the treatments are kept for 3 days before mortality counts are made.
Hellothis virenscens, 3rd instar tobacco budworm
Cotton cotyledons are dipped in the test formulation and allowed to dry in a hood. When dry, each is cut into quarters and ten sections placed individually in 30 mL plastic medicine cups containing a 5 to 7 mm long piece of damp dental wick. One 3rd instar caterpillar is added to each cup and a cardboard lid placed on the cup. Treatments are maintained for 3 days before mortality counts and estimates of reduction in feeding damage are made.
The data obtained for the above described evaluations are reported in Table I.
Claims
Certificate of Correction present
The claims shown below may not include correction changes. Use the corrected PDF for authoritative text.
What is claimed is:
1. A method for controlling insects and acarina which comprises contacting said insects and acarina, their breeding grounds, food supply or habitat with an insecticidally or acaricidally effective amount of a compound having the structural formula ##STR77## wherein W is S(O).sub.n CF.sub.2 R.sub.1 ; R.sub.1 is H, F, Cl, Br, CF.sub.2 H, CCl.sub.2 H, CClFH, CF.sub.3 or CCl.sub.3 ; n is an integer of 0, 1 or 2; X is phenyl substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5, groups; B is S(O).sub.n or 0; R.sub.2 is H, F, CF.sub.2 H, CClFH or CF.sub.3 ; R.sub.3 is H or C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy or NR.sub.4 R.sub.5 ; R.sub.4 is H or C.sub.1 -C.sub.3 alkyl; R.sub.5 is H or C.sub.1 -C.sub.3 alkyl or R.sub.6 CO; R.sub.6 is H or C.sub.1 -C.sub.3 alkyl; Y is H, halogen, CF.sub.3, CN, NO.sub.2, S(O).sub.n CF.sub.2 R.sub.1 or phenyl substituted with one to three halogen, C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, C.sub.1 -C.sub.3 alkylthio, C.sub.1 -C.sub.3 alkylsulfinyl, C.sub.1 -C.sub.3 alkylsulfonyl, CN, NO.sub.2, CF.sub.3, R.sub.2 CF.sub.2 B, R.sub.3 CO or NR.sub.4 R.sub.5 groups; Z is H, halogen or CF.sub.3 ; R is H, ##STR78## or C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms, one cyano, one or two C.sub.1 -C.sub.4 alkoxy groups optionally substituted with one to three halogen atoms, or one phenylcarbonyloxy group optionally substituted with one to three halogen atoms, one to three C.sub.1 -C.sub.4 alkyl groups or one to three C.sub.1 -C.sub.4 alkoxy groups; R.sub.8 is hydrogen or C.sub.1 -C.sub.4 alkyl; R.sub.9 is C.sub.1 -C.sub.6 alkyl optionally substituted with one to three halogen atoms; provided that when R is H or C.sub.1 -C.sub.6 alkyl, X is attached to a carbon atom adjacent to the pyrrole ring nitrogen atom; and when Y is substituted phenyl, X and Y cannot be attached to the pyrrole ring at positions two and three.
2. The method according to claim 1 wherein the compound has the structural formula ##STR79## wherein W is S(O).sub.n CF.sub.2 R.sub.1 ; X is phenyl substituted with one to three halogen, CN, NO.sub.2, CF.sub.3 or R.sub.2 CF.sub.2 B groups; Y is Cl, Br, CF.sub.3, CN or S(O).sub.n CF.sub.2 R.sub.1 ; Z is H, Cl, Br or CF.sub.3 ; R is H or C.sub.1 -C.sub.4 alkyl optionally substituted with one to three halogen atoms, one C.sub.1 -C.sub.4 alkoxy group, one cyano or one phenylcarbonyloxy group optionally substituted with one to three halogen atoms or one C.sub.1 -C.sub.4 alkyl group.
3. The method according to claim 2 wherein the compound has the structural formula ##STR80## wherein W is SO.sub.n CF.sub.3 ; X is phenyl substituted with one to three halogen atoms or CF.sub.3 ; Y is Cl, Br, CF.sub.3, CN or S(O).sub.n CF.sub.3 ; Z is H, Cl, Br or CF.sub.3 ; and R is H or C.sub.1 -C.sub.4 alkyl substituted with one C.sub.1 -C.sub.4 alkoxy group.
4. The method according to claim 2 wherein the compound has the structural formula ##STR81## wherein W is SO.sub.n CF.sub.3 ; X is phenyl substituted with one to three halogen atoms or CF.sub.3 ; Y is Cl, Br, CF.sub.3, CN or S(O).sub.n CF.sub.3 ; Z is H, Cl, Br or CF.sub.3 ; and R is H or C.sub.1 -C.sub.4 alkyl substituted with one C.sub.1 -C.sub.4 alkoxy group.
5. The method according to claim 2 wherein the compound is selected from the group consisting of 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfonyl]pyrrol e; 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]-5-[(trifluoromethyl)thio] pyrrole; 2,3-dibromo-5-(p-chlorophenyl)-1-(ethoxymethyl)-4-[(trifluoromethyl)sulfon yl]pyrrole; 2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole; 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile; 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole; 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfonyl]pyrrole; and 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole.
6. A method for protecting growing plants from attack by insects and acarina which comprises applying to the foliage of said plants or to the soil or water in which they are growing an insecticidally or acaricidally effective amount of a compound having the structural formula ##STR82## wherein W, X, Y, Z and R are as described in claim 1.
7. A method for protecting growing plants from attack by insects and acarina which comprises applying to the foliage of said plants or to the soil or water in which they are growing an insecticidally or acaricidally effective amount of a compound having the structural formula ##STR83## wherein X, W, Y, Z and R are as described in claim 2.
8. The method according to claim 7 wherein the compound is selected from the group consisting of 2-(p-chlorophenyl)-5-(trifluoromethyl)-3-[(trifluoromethyl)sulfonyl]pyrrol e; 2-(p-chlorophenyl)-3-[(trifluoromethyl)sulfonyl]-5-[(trifluoromethyl)thio] pyrrole; 2,3-dibromo-5-(p-chlorophenyl)-1-(ethoxymethyl)-4-[(trifluoromethyl)sulfon yl]pyrrole; 2,3-dibromo-5-(p-chlorophenyl)-4-[(trifluoromethyl)sulfonyl]pyrrole; 2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole-3-carbonitrile; 3,4-dibromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole; 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)sulfonyl]pyrrole; and 3-bromo-2-(p-chlorophenyl)-5-[(trifluoromethyl)thio]pyrrole.
9. The method according to claim 6 wherein the compound is applied to the plants or soil in which they are growing at a rate of about 0.100 kg/ha to 4.0 kg/ha.
10. A composition for controlling insects and acarina comprising an agronomically acceptable carrier and an insecticidally or acaricidally effective amount of a compound having the structural formula ##STR84## wherein W, X, Y, Z and R are as described in claim 1.
11. A composition for controlling insects and acarina comprising an agronomically acceptable carrier and an insecticidally or acaricidally effective amount of a compound having the structural formula ##STR85## wherein W, X, Y, Z and R are as described in claim 2.
Patent Citations (3)
| Patent | Date | Inventor | Cited By |
|---|---|---|---|
| US4267184 | 1981-05-01 | Cherkofsky | |
| EPX300688 | 1989-01-01 | ||
| EPX372982 | 1990-06-01 |
Non-Patent Literature (2)
- H. C. Berk and J. E. Franz, Synthetic Communications, 11, No. 4, pp. 267-271 (1981).
- Helvetica Chimica Acta, 62, pp. 1442-1450 (1979).