N.sup.2 -Arylsulfonyl-L-Argininamides and the Pharmaceutically Acceptable Salts Thereof

Field of the Invention

This invention relates to the discovery of certain new and useful N.sup.2 -arylsulfonyl-L-argininamides and the pharmaceutically acceptable salts thereof, which are of especial value in view of their outstanding antithrombotic properties and low toxicities.

Description of the Prior Art

In the past, there have been many attempts to obtain new and improved agents for the treatment of thrombosis. The N.sup.2 -(p-tolysulfonyl)-L-arginine esters have been found to be one type of agent which can be used and these have been found to be effective in dissolving blood clots. (U.S. Pat. No. 3,622,615, issued Nov. 23, 1971). One family of compounds which have been found to be particularly useful as highly specific inhibitors of thrombin for the control of thrombosis is the N.sup.2 -dansyl-L-arginine ester or amide. (Our pending U.S. application Ser. No. 496,939, filed Aug. 13, 1974 now U.S. Pat. No. 3,978,045). However, there is a continuing need for a highly specific inhibitor of thrombin for the control of thrombosis, which exhibits lower toxicity.

It has now been discovered that N.sup.2 -arylsulfonyl-L-argininamides exhibit antithrombotic activity and even lower toxicity levels at the same relative potencies, as compared with the N.sup.2 -dansyl-L-arginine ester or amide. An N.sup.2 -arylsulfonyl-L-argininamide having the formula (I): ##STR1## or a pharmaceutically acceptable salt thereof, wherein R is ##STR2## wherein R.sub.1 is --COOR.sub.3 wherein R.sub.3 is hydrogen, C.sub.1 -C.sub.10 alkyl, C.sub.6 -C.sub.10 aryl, C.sub.7 -C.sub.12 aralkyl or 5-indanyl; each R.sub.2 independently is hydrogen, C.sub.1 -C.sub.10 alkyl, phenyl, C.sub.1 -C.sub.5 alkoxy, C.sub.2 -C.sub.6 alkoxycarbonyl, or carboxy; n is an integer of 1 to 4, R.sub.1 is substituted into the piperidine ring at the 2 or 3 position; and R.sub.2 is substituted into the piperidine ring at the 2, 3, 4, 5, or 6 position;

and Ar is naphthyl substituted with at least one substituent selected from the group consisting of halo, nitro, cyano, hydroxy, C.sub.1 -C.sub.10 alkyl and C.sub.2 -C.sub.20 dialkylamino, and at least one substituent selected from the group consisting of C.sub.1 -C.sub.10 alkoxy, sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.10 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy, or mixtures thereof; naphthyl substituted with at least one C.sub.1 -C.sub.5 alkoxy and at least one substituent selected from the group consisting of sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 - C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof; naphthyl substituted with at least one substituent selected from the group consisting of sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof; 5,6,7,8-tetrahydronaphthyl substituted with at least one substituent selected from the group consisting of halo, nitro, cyano, hydroxy, C.sub.1 -C.sub.10 alkyl, C.sub.1 -C.sub.10 alkoxy, sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof; a C.sub.9 -C.sub.16 cycloalkylphenyl, C.sub.10 -C.sub.18 cycloalkylalkylphenyl, C.sub.9 -C.sub.16 cycloalkoxyphenyl, C.sub.9 -C.sub.16 cycloalkylthiophenyl, C.sub.7 -C.sub.12 aralkyl, 9,10-dihydroanthryl, 5,6,7,8-tetrahydroanthryl, 9,10-dihydrophenanthryl, 1,2,3,4,5,6,7,8-octahydrophenanthryl, indenyl, indanyl, fluorenyl, acenaphthenyl, phenylthiophenyl, 1,2-methylenedioxyphenyl, 1,2-ethylenedioxyphenyl, chromanyl, isochromanyl, 2,3-dihydrobenzofuranyl, 1,3-dihydroisobenzofuranyl, 2,3-ethylenedioxynaphthyl, xanthenyl, thioxanthenyl, 1,2-trimethylenedioxyphenyl, 2H-chromenyl, 3,4-dehydro-1-isochromanyl, 4H-chromenyl, indolinyl, isoindolinyl, 1,2,3,4-tetrahydroquinolyl or 1,2,3,4-tetrahydroisoquinolyl group, any of which is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, hydroxy, C.sub.1 -C.sub.10 alkyl, C.sub.1 -C.sub.10 alkoxy, C.sub.2 -C.sub.20 dialkylamino, sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl, oxo and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof; a naphthoquinonyl, anthryl, phenanthryl, pentalenyl, heptalenyl, azulenyl, biphenylenyl, as-indacenyl, s-indacenyl, acenaphthylenyl, phenylcarbonylphenyl, phenoxyphenyl, benzofuranyl, isobenzofuranyl, benzo (b) thienyl, isobenzothienyl, oxanthrenyl, thianthrenyl, dibenzofuranyl, dibenzothienyl, phenoxathiinyl, indolyl, 1H-indazolyl, quinolyl, isoquinolyl, phthalazinyl, 1,8-naphthyridinyl, quinoxalinyl, quinazolinyl, cinnolinyl, carbazolyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl or benzimidazolyl group, any of which is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, hydroxy, C.sub.1 -C.sub.10 alkyl, C.sub.1 -C.sub.10 alkoxy, C.sub.2 -C.sub.20 dialkylamino, sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof, a phenyl which is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, hydroxy, C.sub.1 -C.sub.10 alkyl, C.sub.1 -C.sub.10 alkoxy, C.sub.2 -C.sub.20 dialkylamino, sulfoamino, carbamoyl, C.sub.3 -C.sub.10 N,N-dialkylcarbamoyl, amino, C.sub.1 -C.sub.10 alkylamino, mercapto, C.sub.1 -C.sub.10 alkylthio, C.sub.7 -C.sub.12 aralkyl, carboxyl, C.sub.2 -C.sub.10 alkoxycarbonyl, C.sub.2 -C.sub.10 carboxyalkyl, C.sub.1 -C.sub.10 acylamino, C.sub.2 -C.sub.10 alkylcarbonyl, C.sub.1 -C.sub.10 hydroxyalkyl, C.sub.1 -C.sub.10 haloalkyl and phenyl optionally substituted with at least one hydroxy, C.sub.1 -C.sub.5 alkoxy or mixtures thereof.

Also encompassed within this invention are pharmaceutically acceptable salts thereof. This invention also relates to a method for inhibiting activity and suppressing activation of thrombin in vivo in mammals which comprises administering to a mammal a pharmaceutically (antithrombotically) effective amount of an N.sup.2 -arylsulfonyl-L-argininamide or the pharmaceutically acceptable salts thereof.

This invention relates to a group of N.sup.2 -arylsulfonyl-L-argininamides of the formula (I): ##STR3## wherein R is ##STR4## wherein R.sub.1 is --COOR.sub.3 wherein R.sub.3 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.10 alkyl, such as methyl, ethyl, propyl, butyl, tert-butyl, hexyl, octyl, decyl or the like, C.sub.6 -C.sub.10 aryl, such as phenyl, m-tolyl, naphthyl or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl, or the like, and 5-indanyl; each R.sub.2 independently is hydrogen, alkyl of 1-10 (preferably 1-6) carbon atoms, such as methyl, ethyl, propyl, isopropyl, butyl, hexyl, octyl, decyl or the like, phenyl, C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like, C.sub.2 -C.sub.6 alkoxycarbonyl, such as methoxycarbonyl, ethoxycarbonyl or the like, or carboxyl; n is an integer of 1 to 4; R.sub.1 is substituted into the piperidine ring at the 2 or 3 - position; and R.sub.2 is substituted into the piperidine ring at the 2, 3, 4, 5, or 6 - position, and Ar is a naphthyl group substituted with at least one substituent selected from the group consisting of halo, nitro, cyano, hydroxy, alkyl of 1-10 (preferably 1-5) carbon atoms, such as methyl, ethyl, propyl, butyl or the like, and dialkylamino of 2-20 (preferably 2-10) carbon atoms, such as dimethylamino, diethylamino, dipropylamino or the like, and at least one substituent selected from the group consisting of alkoxy of 1-10 (preferably 1-5) carbon atoms, such as methoxy, ethoxy, propoxy, butoxy or the like, sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1- 10 (preferably 1-5) carbon atoms, such as methylamino, ethylamino, propylamino, butylamino or the like, mercapto, alkylthio or 1-10 (preferably 1-5) carbon atoms, such as methylthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl or the like, hydroxyalkyl of 1-10 (preferably 14 5) carbon atoms, such as hydroxymethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydrocy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a naphthyl group sustituted with at least one C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like, and at least one substituent selected from the group consisting of sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino, ethylamino, propylamino, butylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5) carbon atoms, such as methylthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl propionyl or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hydroxymethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a napthyl group substituted with at least one substituent selected from the group consisting of sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino, ethylamino, propylamino, butylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5) carbon atoms, such as methylthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl or 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hyroxmethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a 5,6,7,8-tetrahydronaphthyl group substituted with at least one substituent selected from the group consisting of halo, nitro, cyano, hydroxy, alkyl of 1-10 (preferably 1-5) carbon atoms, such as methyl, ethyl, propyl, butyl or the like, alkoxy of 1-10 (preferably 1-5) carbon atoms, such as methoxy, ethoxy, propoxy, butoxy or the like, sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5) carbon atoms, such as methylthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl, or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hydroxymethyl 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a C.sub.9 -C.sub.16 cycloalkylphenyl, such as cyclopentylphenyl, cyclohexylphenyl, cyclooctylphenyl or the like, C.sub.10 -C.sub.18 cycloalkylalkylphenyl, such as cyclohexylmethylphenyl, (2-cyclohexylethyl)phenyl, (4-cyclohexylbutyl)phenyl, cyclooctylmethylphenyl or the like, C.sub.9 -C.sub.16 cycloalkyloxyphenyl, such as cylopentyloxyphenyl, cyclohexyloxyphenyl, cyclooctyloxyphenyl or the like, C.sub.9 -C.sub.16 cycloalkylthiophenyl, such as cyclopentylthiophenyl, cyclohexylthiophenyl, cyclooctylthiophenyl or the like, C.sub.7 -c.sub.12 aralkyl, such as benzyl, phenethyl or the like, 9,10-dihydrophenanthryl, 5,6,7,8-tetrahydroanthryl 9,10-dihydrophenanthryl, 1,2,3,4,5,6,7,8-octahydrophenanthryl, indenyl, indanyl, fluorenyl, acenaphthenyl, phenylthiophenyl, 1,2-methylenedioxphenyl, 1,2-ethylenedioxyphenyl, chromanyl, isochromanyl, 2,3-dihydrobenzofuranyl, 1,3-dihydroisobenzofuranyl, 2,3-ethylenedioxynaphthyl, xanthenyl, thioxanthenyl, 1,2-trimethylenedioxyphenyl, 2H-chromenyl, 3,4-dehydro-1-isochromanyl, 4H-chromenyl, indolinyl, isoindolinyl, 1,2,3,4-tetrahydroquinolyl, or 1,2,3,4-tetrahydroisoquinolyl group each of which is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, hydroxy, alkyl of 1-10 (preferably 1-5) carbon atoms, such as methyl, ethyl, propyl, butyl or the like, alkoxy of 1-10 (preferably 1-5) carbon atoms, such as methoxy, ethoxy, propoxy, butoxy or the like, dialkylamino of 2-20 (preferably 2-10) carbon atoms, such as dimethylamino, diethylamino, dipropylamino or the like, sulfoamino, carbamoyl, N,N-dialkylcarbamoyl or 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5) carbon atoms, such as methylthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as mthoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl, or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hydroxymethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, oxo and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a naphthoquinonyl, anthryl, phenanthryl, pentalenyl, heptalenyl, azulenyl, biphenylenyl, as-indacenyl, s-indacenyl, acenaphthylenyl, phenylcarbonylphenyl, phenoxyphenyl, benzofuranyl, isobenzofuranyl, benzo(b)thienyl, isobenzothienyl, oxanthrenyl, thianthrenyl, dibenzofuranyl, dibenzothienyl, phenoxathiinyl, indolyl, 1H-indazolyl, quinolyl, isoquinolyl, phthalazinyl, 1,8-naphthyridinyl, quinoxalinyl, cinnolinyl, carbazolyl, acridinyl, phenazinyl, phenothiazinyl, phenoxazinyl or benzimidazolyl group each of whih is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, hydroxy, alkyl of 1-10 (preferably 1-5) carbon atoms, such as methyl, ethyl, propyl, butyl or the like, alkoxy of 1-10 (preferably 1-5) carbon atoms, such as methoxy, ethoxy, propoxy, butoxy or the like, dialkylamino of 2-20 (preferably 2-10) carbon atoms, such as dimethylamino, diethylamino, dipropylamino or the like, sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino, ethylamino, propylamino, butylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5 ) carbon atoms, such as methlthio, ethylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hydroxymethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like; a phenyl which is unsubstituted or substituted with one or more groups selected from the group consisting of halo, nitro, cyano, alkyl of 1-10 (preferably 1-5) carbon atoms, such as methyl, ethyl, propyl, butyl or the like, alkoxy of 1-10 (preferably 1-5) carbon atoms, such as methoxy, ethoxy, propoxy, butoxy or the like, dialkylamino of 2-20 (preferably 2-10) carbon atoms, such as dimethylamino, diethylamino, dipropylamino or the like, sulfoamino, carbamoyl, N,N-dialkylcarbamoyl of 3-10 (preferably 3-7) carbon atoms, such as N,N-dimethylcarbamoyl, N,N-diethylcarbamoyl or the like, amino, alkylamino of 1-10 (preferably 1-5) carbon atoms, such as methylamino or the like, mercapto, alkylthio of 1-10 (preferably 1-5) carbon atoms, such as methylthio, ehtylthio, propylthio, butylthio or the like, aralkyl of 7-12 (preferably 7-10) carbon atoms, such as benzyl, phenethyl or the like, carboxyl, alkoxycarbonyl of 2-10 (preferably 2-6) carbon atoms, such as methoxycarbonyl, ethoxycarbonyl or the like, carboxyalkyl of 2-10 (preferably 2-6) carbon atoms, such as carboxymethyl, 2-carboxyethyl, 2-carboxypropyl or the like, acylamino such as alkylcarbonylamino of 1-10 (preferably 1-5) carbon atoms, such as acetylamino, propionylamino or the like, alkylcarbonyl of 2-10 (preferably 2-6) carbon atoms, such as acetyl, propionyl or the like, hydroxyalkyl of 1-10 (preferably 1-5) carbon atoms, such as hydroxymethyl, 2-hydroxyethyl, 2-hydroxypropyl or the like, haloalkyl of 1-10 (preferably 1-5) carbon atoms, such as chloromethyl, trifluoromethyl, bromomethyl, 2-chloroethyl or the like, and phenyl optionally substituted with at least one hydroxy and/or C.sub.1 -C.sub.5 alkoxy, such as methoxy, ethoxy, propoxy, butoxy or the like. Illustrative of suitable N.sup.2 -arylsulfonyl-L-argininamides are those shown in the table below. In this table, the prior art reference cited in the second column discloses a method of preparation for the compound listed in the second column. The Example No listed in the last column refers to an Example of this application which discloses the details of a method by which the product compound of the fifth column of the table may be prepared.

also illustrative of suitable N.sup.2 -arylsulfonyl-L-argninamides are those shown in the table below. In this table, the Example No listed in the sixth column refers to the Example of this application by which the compound in the first column was prepared. Compound ##STR102## Concentrationrequired toprolong thecoagulationtime by a Preparation Elementary analysisUpper: Calculated (%) Sample Addition factor of two process m.p. Lower: Found (%) I.R. (KBr) No. Ar R moiety (.mu.M) (Ex. No.) (.degree. C) C H N (cm.sup.-1) 1 ##STR103## ##STR104## -- 8 1 powder 52.7652.68 6.356.21 13.38 13.30 3,3603,1601,620 2 " ##STR105## 1/2H.sub.2 SO.sub.3 1 134-6 52.2552.07 6.826.73 11.2910.89 3,3603,1801,7401,375 3 " ##STR106## -- 0.3 1 powder 53.6253.48 6.566.43 13.0312.98 3,3603,1401,622 4 " ##STR107## 1/2H.sub.2 SO.sub.3 1 164-6 52.9852.69 7.006.98 11.0410.86 3,3903,1651,7351,370 5 " ##STR108## -- 2 1 powder 53.6253.43 6.566.51 13.0313.12 3,3603,160 1,620 6 " ##STR109## 1/2H.sub.2 SO.sub.3 1 " 52.9852.59 7.006.79 11.0410.89 3,3903,1701,7871,370 7 " ##STR110## -- 5 1 " 54.4354.38 6.766.79 12.7012.56 3,3503,1801,630 8 " ##STR111## 1/2H.sub.2 SO.sub.3 1 195-6 53.6953.40 7.157.12 10.8010.56 3,3803,1801,7381,375 9 " ##STR112## -- 1.5 1 powder 55.2154.98 6.957.02 12.3812.47 3,3603,200 1,622 10 " ##STR113## 1/2H.sub.2 1 SO.sub.3 1 198-200 54.3754.30 7.307.27 10.5710.36 3,3603,160,7301,368 11 " ##STR114## -- 1 powder 56.6456.41 7.307.17 11.8011.51 3,3603,1801,620 12 " ##STR115## 1/2H.sub.2 1 SO.sub.3 1 172-174 55.6455.31 7.597.63 10.1410.18 3,3803,180,7401,375 13 " ##STR116## -- 0.5 3 powder 51.2050.93 6.176.02 12.9812.63 3,3803,1801,630 14 " ##STR117## ##STR118## 1.5 3 185 47.6747.64 4.924.81 11.1211.12 3,3753,2001,740 15 " ##STR119## -- 2.5 3 powder 52.0752.21 6.376.04 12.6712.51 3,3803,2001,620 16 " ##STR120## -- 3 " 53.6953.53 6.766.69 12.0412.35 3,3803,2001,740 17 " ##STR121## -- 2.5 1 " 52.9052.71 6.576.43 12.3412.46 3,3503,1601,640 18 " ##STR122## 1/2H.sub.2 SO.sub.3 1 " 52.4052.16 6.967.13 10.5410.28 3,3403,1601,7361,380 19 " ##STR123## -- 5 1 " 52.0751.91 6.376.19 12.6512.38 3,3603,1601,620 20 " ##STR124## 1/2H.sub.2 SO.sub.3 1 " 51.6851.43 6.826.66 10.7610.58 3,3803,1601,7401,370 21 " ##STR125## -- 4 1 " 52.9052.59 6.57 6.41 12.3412.16 3,3603,1601,640 22 " ##STR126## 1/2H.sub.2 SO.sub.3 1 " 52.9852.73 7.007.00 11.0410.82 3,3773,1601,7401,368 23 ##STR127## ##STR128## -- 4 4 " 51.2051.31 6.176.01 12.9812.67 3,3603,1801,610 24 " ##STR129## ##STR130## 4 225-7 47.6747.62 4.924.84 11.1211.18 3,3753,2001,742 25 " ##STR131## -- 2 1 powder 53.6253.58 6.566.48 13.0312.94 3,3803,2001,630 26 " ##STR132## 1/2H.sub.2 1 SO.sub.3 1 224 52.9852.73 7.007.00 11.0410.823,3603,1601,740,370 27 ##STR133## ##STR134## -- 15 1 powder 52.8952.77 6.576.80 12.3412.59 3,3803,2001,625 28 " ##STR135## 1/2H.sub.2 1 SO.sub.3 1 " 52.3952.10 6.976.84 10.5410.21 3,3703,1501,740,370 29 " ##STR136## -- 1 " 55.2055.00 6.956.81 12.3812.21 3,3603,1501,620 30 " ##STR137## 1/2H.sub.2 SO.sub.3 1 " 54.3654.25 7.307.11 10.5710.813,3703,2001,7351,370 31 ##STR138## ##STR139## -- 0.5 1 " 54.4354.21 6.556.50 13.8013.79 3,3603,1801,632 32 " ##STR140## 1/2H.sub.2 1 SO.sub.3 1 " 53.6353.50 7.006.79 11.58 11.40 3,3803,2001,740,370 33 " ##STR141## -- 1 " 51.8651.64 6.136.09 13.7513.84 3,3703,2001,625 34 " ##STR142## 1/2H.sub.2 SO.sub.3 1 " 55.2155.11 6.956.76 12.5812.27 3,3803,1801,7381,368 35 ##STR143## ##STR144## -- 0.5 3 " 51.8651.72 6.136.11 13.7513.63 3,3703,1601,620 36 " ##STR145## ##STR146## 3 158-160 47.9447.83 4.854.80 11.5111.43 3,3753,2001,740 37 " ##STR147## -- 1 powder 53.5353.40 6.336.21 14.1914.04 3,3753,1501,620 38 " ##STR148## 1/2H.sub.2 SO.sub.3 1 " 52.8652.77 6.836.66 11.8611.75 3,3803,2001,7401,370 39 " ##STR149## -- 0.5 1 " 54.4354.22 6.556.31 13.8013.59 3,3803,1501,620 40 " ##STR150## 1/2H.sub.2 SO.sub.3 1 131-137(dec.) 53.6353.40 7.007.10 11.5811.40 3,3803,1601,7501,640 41 " ##STR151## -- 1 powder 55.2655.21 6.766.65 13.4313.29 3,3501,630 42 " ##STR152## 1/2H.sub.2 SO.sub.3 1 169-175(dec.) 54.3554.27 7.177.00 11.3211.08 3,3503,1801,7401,640 43 ##STR153## ##STR154## -- 2.5 1 powder 51.8651.77 6.136.00 13.7513.72 3,3653,2001,620 44 " ##STR155## 1/2H.sub.2 SO.sub.3 1 " 51.4751.20 6.656.35 11.5411.24 3,3703,2003,3401,370 45 " ##STR156## -- 1 " 54.4354.28 6.556.31 13.8013.70 3,3753,2001,622 46 " ##STR157## 1/2H.sub.2 SO.sub.3 1 " 53.6353.53 7.007.08 11.5811.40 3,3803,2001,7401,370 47 " ##STR158## -- 1 " 52.7652.47 6.356.01 13.3813.09 3,3753,1801,620 48 " ##STR159## 1/2H.sub. 2 1 SO.sub.3 1 " 52.2452.00 6.826.55 11.2811.00 3,3803,2001,740,368 49 ##STR160## ##STR161## 0.5 H.sub.2 SO.sub.3 1 189-191(dec.) 55.6855.36 6.336.35 10.4710.45 3,3603,160s1,730 50 " ##STR162## -- 2.5 1 powder 56.7356.43 5.825.80 12.2512.19 3,3703,2001,615 51 " ##STR163## ##STR164## 1 132-135(dec.) 52.7852.61 5.17 5.15 10.2610.23 3,3603,1831,720 52 " ##STR165## -- 10 1 powder 57.4257.19 6.02 6.10 11.9611.73 3,3603,1601,620 53 " ##STR166## ##STR167## 1 157-158(dec.) 52.7852.63 5.175.14 10.2610.09 3,3803,2201,750 54 " ##STR168## -- 3.0 1 powder 57.4257.09 6.026.06 11.9611.74 3,3603,2001,590 55 " ##STR169## ##STR170## 1 155-157(dec.) 53.2553.13 5.305.21 10.1110.03 3,3803,1801,720 56 " ##STR171## -- 50 1 powder 58.0857.93 6.226.04 11.6811.54 3,200-3,380(broad)1,620 57 ##STR172## ##STR173## ##STR174## 1 153-156(dec.) 52.2852.14 5.034.98 10.4110.36 3,4003,0801,740 58 " ##STR175## -- 6.5 1 powder 56.7356.58 5.825.73 12.2512.14 3,000-3,400(broad)1,600 59 ##STR176## ##STR177## ##STR178## 1 144-148(dec.) 53.6753.69 5.265.24 10.4310.39 3,3603,2001,720 60 " ##STR179## -- 50 1 powder 59.0459.14 6.196.15 12.3012.28 3,040-3,360(broad)1,610 61 " ##STR180## ##STR181## 1 155-158(dec.) 53.1954.97 5.125.06 10.5910.48 3,4003,2001,730 62 " ##STR182## -- 15 1 powder 58.3758.19 6.005.98 12.6112.49 3,300(broad)1,640 63 ##STR183## ##STR184## ##STR185## 1 147-150(dec.) 59.1959.23 5.125.07 10.5910.54 3,4003,2301,750 64 " ##STR186## -- 20 1 powder 58.3758.21 6.005.93 12.6112.46 3,200(broad)1,620 65 ##STR187## ##STR188## -- 1 " 60.2960.21 6.586.56 11.7211.643,3653,1701,730 66 " ##STR189## -- 2.0 1 " 57.6657.48 5.775.74 12.9312.84 3,3603,1601,610 67 ##STR190## ##STR191## -- 1 1 " 50.2550.45 5.956.01 13.3213.15 3,3501,6201,3801,150 68 ##STR192## ##STR193## 1/2H.sub.2 SO.sub.3 1 " 50.4350.57 6.656.58 10.5010.71 3,3501,7451,6501,360 69 " ##STR194## -- 5 1 171-2 50.6050.51 6.196.30 12.2912.40 3,4001,6351,2601,160 70 " ##STR195## -- 2 powder 55.4055.65 6.626.81 12.4312.19 3,2201,7501,640 71 ##STR196## ##STR197## -- 5 2 " 53.8253.66 6.215.96 13.0812.81 3,3501,6251,155 72 ##STR198## ##STR199## ##STR200## 2 192-193 49.5849.24 4.874.70 11.5611.85 3,2101,7471,638 73 " ##STR201## -- 3 2 powder 54.6456.88 6.186.31 13.8513.83 3,200 (broad)1,6201,150 74 ##STR202## ##STR203## -- 0.4 2 " 54.6354.50 6.426.09 12.7412.81 3,3701,6251,158 75 ##STR204## ##STR205## ##STR206## 2 188-190 50.1750.01 5.034.78 11.3811.56 3,2001,7401,635 76 ##STR207## ##STR208## -- 0.15 2 powder 55.4755.49 6.406.33 13.9813.51 3,250 (broad)1,625 77 ##STR209## ##STR210## -- 2 " 57.0256.81 6.816.91 12.7912.78 3,2001,7401,635 78 " ##STR211## -- 2 " 55.4755.31 6.406.68 13.4813.21 3,3501,6201,150 79 ##STR212## ##STR213## ##STR214## 2 222-3 49.8249.57 5.094.88 11.9911.68 3,2001,7451,630 80 " ##STR215## -- 0.35 2 powder 54.6354.55 6.426.42 12.7412.58 3,350 (broad)1,6201,150 81 ##STR216## ##STR217## ##STR218## 2 154-6 50.92 51.28 5.375.21 10.6610.59 3,4001,7351,635 82 " ##STR219## -- 2 powder 56.1356.11 6.806.85 12.1211.95 3,300 (broad)1,6101,255 83 ##STR220## ##STR221## ##STR222## 2 179-180 50.3850.34 5.235.18 10.8211.05 3,3801,7351,635 84 " ##STR223## -- 2 powder 55.4055.71 6.626.48 12.4312.53 3,3601,6201,150 85 " ##STR224## ##STR225## 2 125(soften) 50.7350.58 5.185.11 11.1910.93 3,3801,7351,638 86 " ##STR226## -- 2 powder 56.2656.41 6.616.48 13.1213.27 3,3601,6201,158 87 ##STR227## ##STR228## -- 2 " 57.5057.56 7.157.08 11.5611.71 3,3302,9601,7401,640 88 " ##STR229## -- 0.5 2 " 56.1356.11 6.806.81 12.1211.96 3,4001,620 89 " ##STR230## -- 2 " 57.5057.15 7.157.21 11.5611.62 3,3602,9601,735 90 " ##STR231## -- 2 " 56.1356.21 6.806.81 12.1212.03 3,4001,6201,150 91 " ##STR232## -- 2 " 54.6354.54 6.426.40 12.7412.68 3,3501,6201,150 92 " ##STR233## -- 2 " 56.1356.08 6.806.91 12.1212.08 3,2501,7401,640 93 ##STR234## ##STR235## -- 2 " 57.0256.86 6.816.83 12.7912.68 3,2301,7401,650 94 " ##STR236## -- 2 " 54.6354.59 6.426.38 12.7412.68 3,2501,6201,160 95 ##STR237## ##STR238## ##STR239## 2 161-163 48.9749.05 4.714.73 11.7611.58 3,3401,7381,635 96 " ##STR240## -- 2 powder 53.8253.68 6.216.08 13.0812.85 3,3701,6351,2551,155 97 ##STR241## ##STR242## -- 2 " 54.6454.58 6.186.09 13.8519.93 3,3701,6401,2601,155 98 ##STR243## ##STR244## ##STR245## 1 165-168(dec.) 51.9451.50 5.645.41 10.3410.40 3,3903,2201,740 99 " ##STR246## -- 1 powder 56.13 56.00 6.816.73 12.1212.01 3,350 (broad)1,640 100 " ##STR247## ##STR248## 1 178-181(dec.) 51.9452.24 5.645.60 10.3410.28 3,4003,2001,735 101 " ##STR249## -- 1 powder 56.1356.28 6.816.59 12.1212.31 3,350 (broad)1,640 102 ##STR250## ##STR251## ##STR252## 1 162-165(dec.) 51.4351.28 5.505.21 10.5010.21 3,3703,2001,730 103 " ##STR253## -- 1 powder 55.4055.28 6.626.32 12.4312.03 3,300 (broad)1,610 (broad) 104 ##STR254## ##STR255## ##STR256## 1 158-160(dec.) 52.7552.56 5.565.43 11.0410.97 3,4053,2201,740 105 " ##STR257## -- 1 powder 56.2656.01 6.616.49 19.1813.21 3,320 (broad)1,640 106 ##STR258## ##STR259## ##STR260## 1 160-163(dec.) 52.3352.03 5.605.30 10.6810.28 3,4003,2101,730 107 " ##STR261## -- 1 powder 57.0257.39 6.816.21 12.7912.38 3,350(broad)1,620 108 ##STR262## ##STR263## ##STR264## 1 152-155(dec.) 52.8352.53 5.735.72 10.5210.29 3,3903,2051,730 109 " ##STR265## -- 1 powder 57.7357.51 7.007.23 12.4712.28 3,3701,630 110 ##STR266## ##STR267## ##STR268## 1 170-172(dec.) 51.4351.09 5.505.45 10.5010.28 3,3803,2201,740 111 " ##STR269## -- 5 1 powder 55.4055.30 6.626.28 12.4312.11 3,2003,400 (broad)1,600 112 " ##STR270## ##STR271## 1 155-158 (dec.) 51.9452.29 5.645.63 10.3410.00 3,3803,2001,730 113 " ##STR272## -- 1 powder 56.1356.40 6.816.61 12.1212.00 3,200-3,400(broad)1,600 114 " ##STR273## -- 1 " 54.6354.40 6.426.30 12.7412.50 3,200-3,400(broad)1,600 115 " ##STR274## ##STR275## 1 165-170(dec.) 50.8150.68 5.585.43 10.64 10.31 3,3803,2001,740 116 " ##STR276## -- 1 powder 54.4354.70 6.766.71 12.7012.35 3,4001,590 117 " ##STR277## ##STR278## 1 164-166 51.3351.60 5.715.38 10.4810.25 3,3603,2001,735 118 " ##STR279## -- 2.0 1 powder 55.2155.00 6.956.30 12.3812.40 3,400-3,200(broad)1,570 119 " ##STR280## ##STR281## 1 168-172 52.7752.54 5.174.98 10.2610.21 3,3803,1801,740 120 ##STR282## ##STR283## -- 2.5 1 powder 57.4257.35 6.025.84 11.9612.00 3,350-1,160(broad)1,600 121 " ##STR284## ##STR285## 1 130-135 53.2553.08 5.305.29 10.1110.29 3,4003,2001,730 122 " ##STR286## -- 1.5 1 powder 58.0857.84 6.226.13 11.6811.46 3,3603,1601,600 123 " ##STR287## ##STR288## 1 158-163(dec.) 51.9551.80 5.645.38 10.3410.30 3,3603,2001,740 124 " ##STR289## -- 1 powder 56.1455.98 6.816.79 12.1312.35 3,380-3,200(broad)1,625 125 ##STR290## ##STR291## ##STR292## 1 160-163(dec.) 52.4452.39 5.765.58 10.1910.00 3,4003,2001,740 126 " ##STR293## -- 4.5 1 powder 56.8456.72 6.996.80 11.8411.76 3,380-3,250(broad)1,595 127 ##STR294## ##STR295## ##STR296## 1 160-165(dec.) 50.6250.39 5.405.28 11.1711.15 3,4003,2101,740 128 " ##STR297## -- 1 powder 54.4354.27 6.556.28 13.8013.59 3,2801,590 129 ##STR298## ##STR299## -- 5 1 " 52.0751.89 6.376.39 12.6512.51 3,3603,200 1,600 130 ##STR300## ##STR301## -- 20 5 210-213 54.8654.72 7.337.21 14.5414.27 3,3501,630 131 ##STR302## ##STR303## -- 5 120-130 55.7355.82 7.527.50 14.1314.01 3,3501,630 132 ##STR304## ##STR305## -- 10 5 108-110 52.1552.21 6.886.71 14.4814.52 3,300 (broad)1,630 133 ##STR306## ##STR307## -- 30 5 powder 58.2358.01 6.456.35 13.5813.46 3,300 (broad)1,635 134 ##STR308## ##STR309## -- 5 " 58.9658.91 6.666.79 13.2213.15 3,200 (broad)1,635 135 ##STR310## ##STR311## -- 5 " 55.7355.81 7.527.40 14.1314.10 3,300 (broad)1,630 136 " ##STR312## -- 5 170-173 57.5657.41 7.547.39 13.4313.50 3,3351,630 137 ##STR313## ##STR314## -- 5 powder 56.7856.85 7.357.29 13.8013.71 3,200 (broad)1,630 138 ##STR315## ##STR316## -- 5 " 58.9658.79 6.666.51 13.2213.19 3,300 (broad)1,630 139 ##STR317## ##STR318## -- 5 142-145 49.0748.90 5.495.38 13.6313.42 3,1501,620 140 ##STR319## ##STR320## -- 5 powder 47.4747.29 5.435.31 12.5812.39 3,1501,630 141 ##STR321## ##STR322## -- 5 " 49.0749.12 5.495.28 13.6313.59 3,1501,630 142 ##STR323## ##STR324## -- 5 123-130 57.0156.88 6.986.71 13.8513.65 3,3001,635 143 ##STR325## ##STR326## -- 0.3 5 powder 56.1956.00 6.776.50 14.2514.00 3,3003,1501,630 144 " ##STR327## -- 0.2 5 " 53.5353.24 6.336.19 14.1913.99 3,300 (broad)1,630 145 " ##STR328## -- 5 " 60.0959.79 6.166.02 12.9312.61 3,300(broad)1,630 146 " ##STR329## -- 14 5 " 58.7358.66 7.016.90 13.1712.91 3,3801,635 147 ##STR330## ##STR331## -- 5 147-150 52.5952.31 6.106.01 14.6114.33 3,3801,640 148 " ##STR332## -- 5 powder 57.2356.98 6.616.33 13.9113.81 3,300(broad)1,630 149 ##STR333## ##STR334## -- 5 " 58.6958.79 5.715.55 13.6913.39 3,300(broad)3,1501,630 150 " ##STR335## -- 5 " 56.1955.95 6.776.58 14.2513.97 3,190(broad)1,620 151 ##STR336## ##STR337## -- 20 5 130-135 53.5353.28 6.336.19 14.1913.97 3,3501,640 152 ##STR338## ##STR339## -- 10 5 152-157 54.4254.28 6.556.32 13.8013.59 3,3501,635 153 ##STR340## ##STR341## -- 4 5 powder 55.3655.10 6.976.76 16.1416.07 3,3801,630 154 " ##STR342## -- 5 " 52.8652.71 6.566.29 16.0816.07 155 ##STR343## ##STR344## -- 5 " 50.9050.81 5.905.70 14.1313.89 3,180(broad)1,630 156 ##STR345## ##STR346## -- 5 " 59.4159.22 5.955.73 13.3313.28 3,170(broad)1,620 157 " ##STR347## HCl 6 " 53.1752.89 6.696.52 12.9212.74 158 " ##STR348## HCl 6 " 57.6657.31 6.346.14 11.5911.16 159 " ##STR349## -- 5 " 55.3355.26 6.546.62 14.6714.58 3,200(broad)1,630 160 ##STR350## ##STR351## -- 0.25 1 " 55.4755.75 6.406.19 13.4813.26 3,350(broad)1,6301,380 161 " ##STR352## -- 0.2 5 " 55.0555.28 7.127.00 13.3813.12 3,200(broad)1,6351,380 162 ##STR353## ##STR354## -- 0.2 1 " 54.2253.98 5.505.55 13.1813.24 3,320(broad)1,6301,380 163 " ##STR355## -- 1 " 57.2257.23 6.356.36 11.9212.08 3,400(broad)1,7401,620 164 " ##STR356## -- 0.15 1 " 53.8253.78 6.216.19 13.0812.86 3,360(broad)1,6251,380 165 " ##STR357## -- 1 " 56.8356.95 6.986.83 11.8411.98 3,400(broad)1,7351,630 166 ##STR358## ##STR359## CH.sub.3 CO.sub.2 H 5 " 53.2853.13 6.626.82 13.8113.71 3,320(broad)1,6301,140 167 ##STR360## ##STR361## -- 5 " 51.1550.86 5.605.66 12.9712.87 3,320(broad)1,6301,380 168 ##STR362## ##STR363## -- 5 " 54.6453.36 6.186.00 13.8513.58 3,350(broad)1,6401,390 169 ##STR364## ##STR365## -- 5 " 56.2755.98 6.616.78 13.1213.24 3,350(broad)1,6301,3801,140 170 ##STR366## ##STR367## -- 5 " 54.2154.36 6.926.93 13.7413.76 3,300(broad)1,6251,3821,160 171 ##STR368## ##STR369## -- 1,2 " 53.0852.86 6.246.33 12.3812.41 3,300(broad)1,6401,160 172 " ##STR370## -- 1 " 56.0255.83 6.976.88 11.2711.28 3,400(broad)1,7451,620 173 ##STR371## ##STR372## -- 0.2 3 " 57.2356.89 6.616.50 13.9113.70 3,390(broad)1,625 174 " ##STR373## CH.sub.3 COOH 3 " 56.8356.72 6.986.81 11.8411.56 3,400(broad)1,7351,640 175 " ##STR374## -- 0.1 2 " 58.7358.52 7.016.77 13.1713.00 3,380(broad)1,620 176 ##STR375## ##STR376## 1/2H.sub.2 SO.sub.3 2 " 55.98 55.69 7.057.21 11.6611.38 3,400(broad)1,7301,635 177 ##STR377## ##STR378## -- 3 " 58.7358.81 7.027.03 13.1713.17 3,300(broad)1,6151,380 178 " ##STR379## CH.sub.3 COOH 3 " 58.1357.98 7.327.56 11.3011.28 3,380(broad)1,7301,630 179 ##STR380## ##STR381## -- 1 3 " 56.4256.38 6.386.52 14.3114.53 3,350(broad)1,6201,160 180 " ##STR382## CH.sub.3 COOH 3 " 56.1356.08 6.806.83 12.1212.12 3,400(broad)1,7401,630 181 ##STR383## ##STR384## -- 0.5 3 " 58.0057.83 6.826.77 13.5013.63 3,350(broad)1,6201,160 182 " ##STR385## CH.sub.3 COOH 3 " 57.5057.61 7.157.11 11.5611.81 3,350(broad)1,7301,620 183 ##STR386## ##STR387## -- 0.35 3 " 55.5855.62 6.616.81 16.2116.03 3,350(broad)1,6201,140 184 ##STR388## ##STR389## -- 3 " 55.9656.12 7.157.28 14.1914.07 3,350(broad)1,6201,150 185 " ##STR390## CH.sub.3 COOH 3 " 55.7455.90 7.457.51 12.0412.18 3,400(broad)1,7301,625 186 ##STR391## ##STR392## -- 3 " 54.3854.08 6.215.91 12.6912.39 3,300(broad)1,625 187 ##STR393## ##STR394## -- 2 " 52.2552.36 6.035.98 12.7012.51 3,4001,7351,6401,160 188 " ##STR395## -- 2 " 50.4650.61 5.585.63 13.3813.40 3,3801,6201,3801,155 189 " ##STR396## -- 2 3 " 52.0652.31 5.765.81 13.8013.51 3,3201,6201,3901,155 190 " ##STR397## -- 2 " 48.9649.13 5.425.38 12.9812.75 3,3501,6201,3801,150 191 ##STR398## ##STR399## -- 5 2 " 51.3851.45 5.815.86 13.0313.12 3,3501,6301,2551,150 192 ##STR400## ##STR401## -- 2 " 49.5049.31 5.345.40 13.7513.68 3,3503,2001,622 193 ##STR402## ##STR403## -- 2 " 58.2758.45 5.906.03 11.7211.53 3,3501,7401,6401,2601,160 194 " ##STR404## -- 2 2 " 57.6257.68 5.705.55 12.0011.73 3,300(broad)1,6201,2501,150 195 " ##STR405## -- 1.5 3 " 56.9357.12 5.495.43 12.3012.14 3,3601,6251,2601,150 196 " ##STR406## -- 6.5 1 " 54.6354.28 6.426.31 12.7412.53 3,350(broad)1,740 197 " ##STR407## -- 2 " 53.8654.16 5.925.62 13.0012.70 3,100(broad)1,620 198 " ##STR408## 1/2 H.sub.2 SO.sub.3 2 " 54.5354.23 6.105.80 9.649.34 1,720(broad)1,630 199 ##STR409## ##STR410## -- 2 " 48.5548.31 4.934.64 11.8011.53 3,300(broad)1,620 200 ##STR411## ##STR412## HCl 2 6 " 54.1053.81 7.327.13 10.18 9.93 3,180(broad)1,7401,630 201 " ##STR413## -- 2 " 57.2256.98 6.246.18 11.1211.31 3,3001,1501,7401,650 202 " ##STR414## HCl 20 6 " 54.0953.83 6.055.97 10.5110.36 3,2503,1001,7401,640 203 " ##STR415## HCl 30 6 " 55.5355.37 6.126.01 10.1210.01 3,3503,1501,7401,650 204 ##STR416## ##STR417## -- 4.5 2 " 48.9649.13 5.425.36 12.9813.01 3,3501,6201,380 205 " ##STR418## -- 2.5 2 " 54.6454.63 6.426.56 12.7413.01 3,3602,9401,6201,380 206 ##STR419## ##STR420## -- 12 2 " 59.8959.65 4.524.63 11.6411.81 3,3601,6201,2551,150 207 " ##STR421## -- 55 2 " 50.1549.91 6.416.35 14.0413.83 3,2801,620 208 " ##STR422## -- 2 " 53.8553.61 5.935.76 13.0012.84 3,3201,610 209 " ##STR423## -- 2 2 " 57.4257.37 6.025.86 11.9611.74 3,300(broad)1,600 210 ##STR424## ##STR425## -- 2 " 57.4157.33 6.035.94 11.9611.73 3,3001,610 211 " ##STR426## -- 2.52 " 53.9853.74 5.385.33 11.6611.743,3501,630 212 ##STR427## ##STR428## -- 6.5 2 "52.0652.40 6.386.37 12.6512.73 3,350(broad)1,620 213 " ##STR429## -- 2 " 52.0751.95 6.376.27 12.6512.84 3,350(broad)1,620 214 " ##STR430## -- 15 2 " 52.7552.68 6.366.34 13.3813.41 3,380(broad)1,620 215 " ##STR431## -- 2 " 50.9750.67 6.586.61 13.7213.39 3,200(broad)1,610(broad) 216 " ##STR432## 1/2H.sub.2 SO.sub.3 2 " 52.0151.77 6.696.50 10.1110.00 1,7251,620 217 ##STR433## ##STR434## -- 5 " 46.8146.63 6.005.94 14.3714.23 3,4003,3001,630 218 ##STR435## ##STR436## -- 5 " 51.3851.24 5.825.79 13.0312.87 3,3803,3001,630 219 ##STR437## ##STR438## -- 1 " 52.1552.03 6.886.73 14.4814.68 3,3551,6301,3801,305 220 ##STR439## ##STR440## 2H.sub.2 O 2 2 195-198 50.4250.48 6.546.16 12.2512.31 3,3201,620 221 " ##STR441## 1/2H.sub.2 O 15 2 229-233 52.9452.73 6.306.15 12.8712.93 3,3501,620 222 ##STR442## ##STR443## -- 6.5 1 powder 48.7848.54 5.775.76 12.9313.15 3,3201,6201,390 223 ##STR444## ##STR445## -- 1 " 50.2750.11 5.955.87 13.3313.34 3,3901,6301,2601,160 224 ##STR446## ##STR447## -- 5 " 53.7653.66 5.955.83 14.2514.19 3,4003,2001,635 225 ##STR448## ##STR449## -- 5 " 46.6246.53 6.386.21 14.3114.43 3,3503,1501,630 226 ##STR450## ##STR451## -- 5 " 49.7149.84 7.027.26 13.1813.36 3,250broad 3,1501,630 227 " ##STR452## -- 5 " 46.2446.31 6.406.53 13.4813.41 3,3203,1501,630 228 ##STR453## ##STR454## HCl 1 " 47.7447.53 6.756.51 14.6514.41 3,3403,1801,640 229 ##STR455## ##STR456## 1 52.9552.79 6.005.87 13.4313.28 3,3503,1501,620 230 " ##STR457## 1 53.16 5.64 13.48 231 ##STR458## ##STR459## 5 40.7140.60 4.954.78 13.1913.03 3,3603,1601,620 232 ##STR460## ##STR461## -- 3 " 55.5955.54 6.296.14 12.4712.35 3,3503,1501,625 233 ##STR462## ##STR463## -- 3 " 57.4357.26 6.136.04 12.8812.71 3,3503,1301,615 234 ##STR464## ##STR465## -- 5 " 46.8046.61 6.116.05 15.1615.23 3,3753,1501,630 235 ##STR466## ##STR467## -- 3 " 50.8250.71 6.866.69 12.8912.57 3,3603,1201,620

The pharmaceutically acceptable salts of the above compounds are of course also included within the scope of this invention.

For the preparation of the compounds of this invetion, various methods can be employed depending upon the particular starting materials and/or intermediates involved. Successful preparation of these compounds is possible by way of several synthetic routes which are outlined below.

(a) Condensation of an L-argininamide with an arylsulfonyl halide. This process may be illustrated as follows: ##STR468## In the above formulas, R and Ar are as defined herein above; X is halogen; R'" is a protective group for the .alpha.-amino group, such as benzyloxycarbonyl or tertbutoxycarbonyl; R' and R" are selected from the group consisting of hydrogen and protective groups for the guanidino group, such as nitro, tosyl, trityl, oxycarbonyl and the like; and at least one of R' and R" is a protective group for the guanidino group. The N.sup.2 -arylsulfonyl-L-argininamide (I) is prepared by the condensation of an L-argininamide (VI) with a substantially equimolar amount of an arylsulfonyl halide (VII), preferably a chloride.

The condensation reaction is generally effected in a suitable reaction-inert solvent in the presence of an excess of a base, such as an organic base (triethylamine, pyridine) or a solution or an inorganic base (sodium hydroxide, potassium carbonate), at a temperature of 0.degree. C to the boiling temperature of the solvent for a period of 10 minutes to 15 hours.

The preferred solvents for the condensation include benzene-diethyl ether, diethyl ether-water and dioxane-water.

After the reaction is complete, the formed salt is extracted with water, and the solvent is removed by such standard means as evaporation under reduced pressure to give the N.sup.2 -arylsulfonyl-L-argininamide (I), which can be purified by trituration or recrystallization from a suitable solvent, such as diethyl ethertetrahydrofuran, diethyl ether-methanol and water-methanol, or may be chromotographed on silica gel. The L-argininamides (VI) starting materials required for the condensation reaction can be prepared by protecting the guanidino and .alpha.-amino groups of L-arginin (II) via nitration, acetylation, formylation, phthaloylation, trifluoroacetylation, p-methoxybenzyloxycarbonylation, benzolylation, benzyloxycarbonylation, tert-butoxycarbonylation or tritylation and then condensing the formed N.sup.G -substituted-N.sup.2 -substituted-L-arginine (III) with a corresponding amino acid derivative (IV) by such a conventional process as the acid chloride method, azide method, mixed anhydride method, activated ester method or carbodiimide method, and thereafter selectively removing the protective groups from the formed N.sup.G -substituted-N.sup.2 -substituted-L-argininamide (V).

The amino acid derivatives (IV) which are the starting materials for the preparation of the N.sup.G -substituted-N.sup.2 -substituted-L-argininamides (V) are represented by the following formula (VIII). ##STR469## In the above formulas, R.sub.1, R.sub.2 and n are as defined herein above.

accordance with the process employed for preparing 2-piperidinecarboxylic acid derivatives (VIII),the following scheme is illustrative: ##STR470## In the first reaction of the aforementioned scheme, an appropriately substituted piperidine (IX) is contacted with an aqueous sodium hypochlorite solution at a temperature of -5.degree. C to 0.degree. C. The resultant product (X) is isolated by extraction with solvent, e.g., diethyl ether, and then treated with potassium hydroxide in a lower alkanol solvent to give the 1,2-dehydropiperidine (XI). The action of cyanogenating agents, e.g., hydrogen cynaide or sodium cyanide converts the 1,2-dehydropiperidines (XI) to the corresponding 2-cyano analogs (XII). Hydrolysis of the 2-cyanopiperidines (XII) to yield the 2-piperidinecarboxylic acids (XIII) is effected by treatment of the 2-cyanopiperidines (XII) with an inorganic acid, such as hydrochloric acid or sulfuric acid.

The arylsulfonyl halides (VII) which are the starting materials for the preparation of the N.sup.2 -arylsulfonyl-L-argininamides (I) can be prepared by halogenating the requisite arylsulfonic acids or their salts, e.g., sodium salts, by conventional methods well known to those skilled in the art.

In practice, halogenation is carried out without a solvent or in a suitable solvent e.g., halogenated hydrocarbons or DMF in the presence of a halogenating agent, e.g., phosphorous oxychloride, thionyl chloride, phosphorous trichloride, phosphorous tribromide or phosphorous pentachloride, at a temperature of -10.degree. C to 200.degree. C for a period of 5 minutes to 5 hours. After the reaction is complete, the reaction product is poured into ice water and then extracted with a solvent such as ether, benzene, ethyl acetate, chloroform or the like.

The arylsulfonyl halide can be purified by recrystallization from a suitable solvent such as hexane, benzene or the like.

(b) Removal of the N.sup.G -substituent from an N.sup.G -substituted-N.sup.2 -arylsulfonyl-L-argininamide

This process may be illustrated as follows: ##STR471## In the above formulas, R, Ar, X, R', R" and R'" are as defined herein above.

The N.sup.2 -arylsulfonyl-L-argininamide (I) is prepared by removing the N.sup.G -substituent from an N.sup.G -substituted-N.sup.2 -arylsulfonyl-L-argininamide (XV) by means of acidolysis or hydrogenolysis.

The acidolysis is generally effected by contacting the N.sup.G -substituted-N.sup.2 -arylsulfonyl-L-argininamide (XV) and an excess of an acid such as hydrogen fluoride, hydrogen chloride, hydrogen bromide or trifluoroacetic acid, without a solvent or in a solvent, such as an ether (tetrahydrofuran, dioxane), an alcohol (methanol, ethanol) or acetic acid at a temperature of -10.degree. C to 100.degree. C, and preferably at room temperature for a period of 30 minutes to 24 hours.

The products are isolated by evaporation of the solvent and the excess acid, or by trituration with a suitable solvent followed by filtration and drying.

Because of the use of the excess acid, the products are generally the acid addition salts of the N.sup.2 -arylsulfonyl-L-argininamides (I), which can be easily converted to a free amide by neutralization.

The removal of the nitro group and the oxycarbonyl group, e.g., benzyloxycarbonyl, p-nitrobenzyloxycarbonyl, is readily accomplished by the hydrogenolysis. At the same time, the benzyl ester moiety which can be included in the R group is converted to the carboxyl group by the hydrogenolysis.

The hydrogenolysis is effected in a reaction-inert solvent, e.g., methanol, ethanol, tetrahydrofuran or dioxane, in the presence of a hydrogen-activating catalyst, e.g., Raney nickel, palladium, or platinum, in a hydrogen atmosphere at a temperature of 0.degree. C to the boiling temperature of the solvent for a period of 2 hours to 120 hours.

The hydrogen pressure is not critical, and atmospheric pressure is sufficient.

The N.sup.2 -arylsulfonyl-L-argininamides (I) are isolated by filtration of the catalyst followed by evaporation of the solvent.

The N.sup.2 -arylsulfonyl-L-argininamides can be purified in the same manner as described above.

The N.sup.G -substituted-N.sup.2 -arylsulfonyl-L-argininamides (XV) starting materials can be prepared by condensing an N.sup.G -substituted-N.sup.2 -substituted L-arginine (III) (generally the N.sup.G -substituent is nitro or acyl, and the N.sup.2 -substituent is a protective group for the amino group, such as benzyloxycarbonyl, tert-butoxycarbonyl, or the like) and a corresponding amino acid derivative (IV), selectively removing only the N.sup.2 -substituent of an N.sup.G -substituted-N.sup.2 -substituted L-argininamide (V) by means of catalytic hydrogenolysis or acidolysis, and then condensing the thus obtained N.sup.G -substituted-L-argininamide (XIV) with an arylsulfonyl halide (VII), preferably a chloride in the presence of a base in a solvent. These reaction conditions are as described above in the condensation of an L-argininamide with an arylsulfonyl halide, and the removal of the N.sup.G -substituent from and N.sup.G -substituted-N.sup.2 -arylsulfonyl-L-argininamide.

(c) Condensation of an N.sup.2 -arylsulfonyl-L-arginyl halide with an amino acid derivative

This process may be illustrated as follows: ##STR472## In the above formulas, R, Ar and X are as defined herein above.

The N.sup.2 -arylsulfonyl-L-argininamide (I) is prepared by the condensation of an N.sup.2 -arylsulfonyl-L-arginyl halide (XVII), preferably a chloride with at least an equimolar amount of an amino acid derivative (IV). The condensation reaction can be carried out without an added solvent in the presence of a base. However, satisfactory results will be obtained with the use of a solvent such as basic solvents (dimethylformamide, dimethylacetamide, etc.) or halogenated solvents (chloroform, dichloromethane, etc.).

The amount of the solvent to be used is not critical and may vary from about 5 to 100 times the weight of the N.sup.2 -arylsulfonyl-L-arginyl halide (XVII).

Preferred condensation reaction temperatures are in the range of from -10.degree. C to room temperature. The reaction time is not critical, but varies with the amino acid derivative (IV) employed. In general, a period of from 5 minutes to 10 hours is operable. The obtained N.sup.2 -arylsulfonyl-L-argininamide can be isolated and purified in the same manner as described above.

The N.sup.2 -arylsulfonyl-L-arginyl halide (XVII) starting materials required for the condensation reaction can be prepared by reacting an N.sup.2 -arylsulfonyl-L-arginine (XVI) with at least an equimolar amount of a halogenating agent such as thionyl chloride, phosphorous oxychloride, phosphorus trichloride, phosphorous pentachloride or phosphorus tribromide. The halogenation can be carried out with or without an added solvent. The preferred solvents are chlorinated hydrocarbons such as chloroform and dichloromethane, and ethers such as tetrahydrofuran and dioxane.

The amount of the solvent to be used is not critical and may vary from about 5 to 100 times the weight of the N.sup.2 -arylsulfonyl-L-arginine (XVI).

Preferred reaction temperatures are in the range of -10.degree. C to room temperature. The reaction time is not critical, but varies with the halogenating agent and reaction temperature. In general, a period of 15 minutes to 5 hours is operable.

The N.sup.2 -arylsulfonyl-arginines (XVI) which are the starting materials for the preparation of the N.sup.2 -arylsulfonyl-L-arginyl halides (XVII) can be prepared by the condensation of L-arginine (II) with a substantially equimolar amount of arylsulfonyl halides (VII), by a method similar to that described in the condensation of an L-argininamide with an arylsulfonyl halide.

(d) Guanidylation of an N.sup.2 -arylsulfonyl-L-ornithinamide or an acid addition salt thereof.

This process may be illustrated as follows: ##STR473## In the above formulas, R and Ar are as defined herein above.

The N.sup.2 -arylsulfonyl-L-argininamide (I) is prepared by guanidylating an N.sup.2 -arylsulfonyl-L-ornithinamide (XVIII) with an ordinary guanidylating agent such as an O-alkylisourea, S-alkylisothiourea, 1-guanyl- 3,5-dimethylpyrazole or carbodiimide. The preferred guanidylating agents are the O-alkylisourea and the S-alkylisothiourea.

The guanidylation of the N.sup.2 -arylsulfonyl-L-ornithinamide (XVIII) with the O-alkylisourea or S-alkylisothiourea is generally effected in a solvent in the presence of a base at a temperature of from 0.degree. C to the boiling temperature of the solvent for a period of from 30 minutes to 50 hours.

Examples of the preferred bases are triethylamine, pyridine, sodium hydroxide and sodium methoxide. The base is used in an amount of 0.01 to 0.1 equivalent to the N.sup.2 -arylsulfonyl-L-ornithinamide.

Examples of the preferred solvents are water, water-ethanol and water-dioxane.

After the reaction is complete, the N.sup.2 -arylsulfonyl-L-ar gininamide (I) is isolated by evaporation of the solvent followed by removal of the excess base and the formed salt by a water wash.

It is well recognized in the art that an ester derivative of the N.sup.2 -arylsulfonyl-L-argininamide (I) wherein R.sub.3 is alkyl, aralkyl, aryl or 5-indanyl, can be prepared from a carboxylic acid derivative of the N.sup.2 -arylsulfonyl-L-argininamide wherein R.sub.3 is hydrogen, by the conventional esterification methods well known to those skilled in the art. It is also well recognized in the art that the carboxylic acid derivative can be prepared from the ester derivative by the conventional hydrolysis or acidolysis methods. The conditions under which esterification, hydrolysis or acidolysis would be carried out will be each apparent to those skilled in the art.

The N.sup.2 -arylsulfonyl-L-argininamide (I) of this invention forms acid addition salts with any of a variety of inorganic and organic acids. Some of the N.sup.2 -arylsulfonyl-L-argininamides containing a free carboxyl group, wherein R.sub.3 is hydrogen, forms salts with any of a variety of inorganic and organic bases.

The product of the reactions described above can be isolated in the free form or in the form of salts. In addition, the product can be obtained as pharmaceutically acceptable acid addition salts by reacting one of the free bases with an acid, such as hydrochloric, hydrobromic, hydroiodic, nitric, sulfuric, phosphoric, acetic, citric, maleic, succinic, lactic, tartaric, gluconic, benzoic, methanesulfonic, ethanesulfonic, benzenesulfonic, p-toluenesulfonic acid or the like. In a similar manner, the product can be obtained as pharmaceutically acceptable salts by reacting one of the free carboxylic acids with a base, such as sodium hydroxide, potassium hydroxide, ammonium hydroxide, triethylamine, procaine, dibenzylamine, 1-ephenamine, N,N'-dibenzylethylenediamine, N-ethylpiperidine or the like.

Likewise, treatment of the slats with a base or acid results in a regeneration of the free amide.

As stated above, the N.sup.2 -arylsulfonyl-L-argininamides, and the salts thereof of this invention are characterized by their highly specific inhibitory activity in mammals against thrombin as well as by their substantial lack of toxicity, and therefore these compounds are useful in the determination of thrombin in blood as diagonostic reagents, and/or for the medical control or prevention of thrombosis.

The compounds of this invention are also useful as an inhibitor of platelet aggregation.

The antithrombotic activity of the N.sup.2 -arylsulfonyl-L-argininamide of this invention was compared with that of a known antithrombotic agent, N.sup.2 -(p-tolylsulfonyl)-L-arginine methyl ester, by determining the fibrinogen coagulation time. The measurement of the fibrinogen coagulation time was conducted as follows:

An 0.8 ml aliquot of a fibrinogen solution, which had been prepared by dissolving 150 mg of bovine fibrinogen (Cohn fraction I) supplied by Armour Inc. in 40 ml of a borate saline buffer (pH 7.4), was mixed with 0.1 ml of a borate saline buffer, pH 7.4, (control) or a sample solution in the same buffer, and 0.1 ml of a thrombin solution (5 units/ml) supplied by Mochida Pharmaceutical Co., Ltd. was added to the solutions in an ice bath.

Immediately after mixing, the reaction mixture was transferred from the ice bath to a bath maintained at 25.degree. C. Coagulation times were taken as the period between the time of transference to the 25.degree. C bath and the time of the first appearance of fibrin threads. In the cases where no drug samples were added, the coagulation time was 50-55 seconds. The experimental results are summarized in Table 1. The term "concentration required to prolong the coagulation time by a factor of two" is the concentration of an active ingredient required to prolong the normal coagulation time 50-55 seconds to 100-110 seconds.

The concentration required to prolong the coagulation time by a factor of two for the known antithrombotic agent, N.sup.2 -(p-tolylsulfonyl)-L-arginine methyl ester, was 1,100.mu.m. The inhibitors are shown in Table 1 by indicating R and Ar in the formula (I) and the addition moiety.

When a solution containing an N.sup.2 -arylsulfonyl-L-argininamide of this invention was administered intravenously into animal bodies, the high antithrombotic activity in the circulating blood was maintained for from one to three hours. The halflife for decay of the anti-thrombotic compounds of this invention in circulating blood was shown to be approximately 60 minutes; the physiological conditions of the host animals (rat, rabbit, dog and chimpanzee) were well maintained. The experimental decrease of fibrinogen in animals caused by infusion of thrombin was satisfactorily controlled by simultaneous infusion of the compounds of this invention.

The acute toxicity values (LD.sub.50) determined by intraperitoneal administration of substances of formula (I) in mice (male, 20 g) range from about 1,000 to 10,000 milligrams per kilogram of body weight.

Representative LD.sub.50 values for the compounds of this invention are shown in the following Table.

On the other hand, LD.sub.50 values for N.sup.2 -dansyl-N-butyl-L-argininamide and N.sup.2 -dansyl-N-methyl-N-butyl-L-argininamide are 75 and 70 milligrams per kilogram, respectively. The therapeutic agents of this invention may be administered to mammals, including humans alone or in combination with pharmaceutically acceptable carriers, the proportion of which is determined by the solubility and chemical nature of the compound, chosen route of administration and standard pharmaceutical practice.

For example, the compounds may be injected parenterally, that is, intramuscularly, intravenously or subcutaneously. For parenteral administration, the compounds may be used in the form of sterile solutions containing other solutes, for example, sufficient saline or glucose to make the solution isotonic. The compounds may be administered orally in the form of tablets, capsules, or granules containing suitable excipients such as starch, lactose, white sugar and the like. The compounds may be administered sublingually in the form of troches or lonzenges in which each active ingredient is mixed with sugar or corn syrups, flavoring agents and dyes, and then dehydrated sufficiently to make the mixture suitable for pressing into solid form. The compounds may be administered orally in the form of solutions which may contain coloring and flavoring agents. Physicians will determine the dosage of the present therapeutic agents which will be most suitable, and dosages vary with the mode of administration and the particular compound chosen. In addition, the dosage will vary with the particular patient under treatment. When the composition is administered orally, a larger quantity of the active agent will be required to produce the same effect as caused with a smaller quantity given parenterally.

The therapeutic dosage is generally 10-50 mg/kg of active ingredient parenterally, 10-500 mg/kg orally per day. Having generally described the invention, a more complete understanding can be obtained by reference to certain specific examples, which are included for purposes of illustration only and are not intended to be limiting unless otherwise specified.

It is to be understood that the present invention includes pharmaceutical compositions containing a compound of the invention as an active ingredient. Such compositions may be in the forms described above.

In particular, the invention includes such compositions in unit dose form.

(A) Ethyl 1-[N.sup.G -nitro-N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylate. To a well stirred solution of 2.05 g of ethyl 1-(N.sup.G -nitro-L-arginyl)-4-methyl-2-piperidinecarboxylate hydrochloride and 1.26 g of NaHCO.sub.3 in 10 ml of water and 40 ml of dioxane, was added in portions 2.2 g of 3-cyclohexyl-4-methoxybenzenesulfonyl chloride, while maintaining the temperature at 0.degree. C. The reaction mixture was stirred overnight at room temperature. At the end of this period, the reaction mixture was evaporated to dryness. The residue was taken up in 50 ml of ethyl acetate, and the ethyl acetate solution was washed consecutively with 10% citric acid, saturated NaCl, saturated NaHCO.sub.3 and saturated NaCl solutions. The ethyl acetate solution was evaporated and the residue was chromatograhed on silica gel packed in chloroform, and eluted from chloroform containing 3% methanol. The main fraction was evaporated to dryness to give 2.6 g of ethyl 1-[N.sup.G -nitro-N.sup.2 -(3-cyclohexyl- 4-methoxybenzenesulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylate. I.R. (KBr): 3400, 1735, 1635, 1250 (cm.sup.-1)

(B) Ethyl 1-[N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca robylate acetate.

To a solution of 2.6 g of ethyl 1-[N.sup.G -nitro-N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylate in 40 ml of ethanol, 10 ml of water and 20 ml of acetic acid, was added 0.5 g of palladium black and then the mixture was shaken in a hydrogen atmosphere for 15 hours at room temperature. The solution was filtered to remove the catalyst and evaporated to give an oily product.

Reprecipitation with ethanol-diethyl ether gave 2.4 g of ethyl 1-[N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylate acetate.

(C) 1-[N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylic acid.

A solution of 2.4 g of ethyl 1-[N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylate acetate in 10 ml of ethanol and 10 ml of N-NaOH solution was stirred overnight at room temperature. Then, the reaction mixture was concentrated and dissolved in 10 ml of water. The solution was neutralized with 2N-HCl solution to give a white gummy precipitate which was dissolved in 150 ml of chloroform. The chloroform solution was washed with saturated NaCl solution, dried over anhydrous sodium sulfate and evaporated in vacuo to give 1.52 g of 1-[N.sup.2 -(3-cyclohexyl-4-methoxyphenylsulfonyl)-L-arginyl]-4-methyl-2-piperidineca rboxylic acid as an amorphous solid. I.R. (KBr): 3350, 2920, 1620, 1250 cm.sup.-1.

Analysis-Calcd. for C.sub.26 H.sub.41 O.sub.6 N.sub.5 S (percent): C, 56.60; H, 7.49; N, 12.70. Found (percent): C, 56.51; H, 7.53; N, 12.68.

(A) N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl chloride hydrochloride.

A suspension of 3 g of N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginine in 20 ml of thionyl chloride was stirred for 2 hours at room temperature. Addition of cold dry diethyl ether resulted in a precipitate which was collected by filtration and washed several times with dry diethyl ether to give N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl chloride hydrochloride.

(B) Ethyl 1-[N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylate.

To a stirred solution of 3.6 g of ethyl 4-methyl-2-piperidinecarboxylate in 50 ml of chloroform, which was cooled in an ice-salt bath, was added in portions N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl chloride hydrochloride obtained above. The reaction mixture was stirred overnight at room temperature. At the end of this period, 50ml of chloroform was added and the chloroform solution was washed twice with 25 ml of saturated sodium chloride solution, dried over Na.sub.2 SO.sub.4 and evaporated in vacuo. The oily residue was washed with ether to give 3.5 g of powdery ethyl 1-[N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylate.

(C) 1-[N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylic acid.

A solution of 3.5 g of ethyl 1-[N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylate in 15 ml of methanol and 10 ml of 2N-NaOH solution was warmed to 30.degree. C and held at that temperature for 10 hours. At the end of this period, the reaction mixture was concentrated and chromatographed on 200 ml of Daiaion.RTM. SK 102 ion exchange resin (200-300 mesh, H.sup.+ form, manufactured by Mitsubishi Chemical Industries Limited) packed in water, washed with ethanol-water (1:4) and eluted with ethanol-water-NH.sub.4 OH (10:9:1). The main fraction was evaporated to dryness and washed with ether to give 1.0 g of 1-[N.sup.2 -(2-phenoxathiinylsulfonyl)-L-arginyl]-4-methyl-2-piperidinecarboxylic acid as an amorphous solid. I.R. (KBr): 3400, 1625, 1460, 1165 cm.sup.-1.

Analysis-calcd. for C.sub.25 h.sub.31 O.sub.6 N.sub.5 S.sub.2 (percent): C, 53.46; H, 5.56; N, 12.47. Found (percent): C, 53.55; H, 5.63; N, 12.51.

Various other N.sup.2 -arylsulfonyl-L-argininamides or acid addition salts thereof were synthesized in accordance with the procedures of the above examples, and the test results are summarized in Table 2.

(A) 4-methyl-2-piperidinecarbonitrile

To 500 g of 10% sodium hypochlorite solution cooled in an ice bath, there was added dropwise a solution of 33.6 g (0.21 mole) of 4-methylpiperidine acetate in 10 ml of water over a period of 1 hour. At the end of this period, the reaction product was extracted twice with 500 ml of ethyl ether and dried over anhydrous sodium sulfate. After evaporation of ethyl ether, the residue was added dropwise to a solution of 11.8 g (0.21 mole) of potassium hydroxide in 100 ml of 96% ethanol under reflux.

Refluxing was continued for an additional 10 minutes. Ethanol was evaporated and the residue was dissolved into 50 ml of 2N sodium hydroxide solution and then extracted with ether.

The ether layer was dried over anhydrous sodium sulfate and then ether evaporated. The residue was added to an ice-cooled solution of 27 g (1 mole) of hydrogen cyanide and 25 ml of concentrated hydrochloric acid in 300 ml of water. The solution was stirred at a temperature of 10 to 20.degree. C for 4 hours and thereafter made basic by the addition of solid sodium hydroxide. The reaction product was extracted with ether, dried over anhydrous sodium sulfate and then distilled under reduced pressure to give 17 g (66%) of 4-methyl-2-piperidinecarbonitrile, B.P. 96-97.degree. C/10 mmHg.

The following 2-piperidinecarbonitriles not previously reported in the chemical literature were synthesized by the aforementioned procedure which is essentially that as taught by Grundon et al., J. Chem. Soc., 1963, 3898, Grundon et al., J. Chem. Soc., 1964, 2448, R. Bonnett et al., J. Chem. Soc., 1959, 2092 and H. Bohme et al., Ber., 92, 1613 (1959).

(B) 4-Methyl-2-piperidinecarboxylic acid hydrochloride

A solution of 16 g of 4-methyl-2-piperidinecarbonitrile in 250 ml of 6N hydrochloric acid was refluxed for 6 hours. After evaporation of the solvent, the residue was recrystallized from water to give 13 g of 4-methyl-2-piperidinecarboxylic acid hydrochloride.

(C) Ethyl 4-methyl-2-piperidinecarboxylate

a solution of 13 g (0.072 mole) of 4-methyl-2-piperidinecarboxylic acid hydrochloride and 50 ml of thionyl chloride in 300 ml of ethanol was refluxed for 4 hours. At the end of this period, the solvent was evaporated under reduced pressure, and the residue was extracted with a solution of chloroform and saturated potassium carbonate solution.

The chloroform layer was dried over anhydrous sodium sulfate and then chloroform was evaporated. Distillation of the residue gave 7.4 g (60%) of ethyl 4-methyl-2-piperidinecarboxylate, B.P. 76-77.degree. C/3 mmHg.

(D) Benzyl 4-methyl-2-piperidinecarboxylate p-toluenesulfonate

A solution of 20 g (0.112 mole) of 4-methyl-2-piperidinecarboxylic acid hydrochloride, 24 g (0.224 mole) of benzyl alcohol and 25.6 g (0.134 mole) of p-toluenesulfonic acid monohydrate in 100 ml of benzene was refluxed for 5 hours with the continuous removal of water through a Dean-Stark water trap. At the end of this period, the solvent was distilled off, and the residue was washed with ether-n-hexane and recrystallized to give 10 g (22%) of benzyl 4-methyl-2-piperidinecarboxylate p-toluenesulfonate, M.P. 160-163.degree. C.

The following 2-piperidinecarboxylates not previously reported in the chemical literature were synthesized by the aforementioned procedure.