Alkenyl and Alkinylureido Cephalosporins

Cephalosporins having a ureido acyl side chain are disclosed in U.S. Pat. Nos. 3,673,183; 3,708,479; 3,833,568; and 3,860,591. Cephalosporins having various acyl side chains and a 7.alpha.-methoxy substituent are taught in various U.S. patents including U.S. Pat. Nos. 3,775,410; 3,780,031; 3,780,033; 3,780,034; 3,780,037; 3,843,641; etc.

Cephalosporins having an acylureido acyl side chain are disclosed in U.S. Pat. Nos. 3,687,949 and 3,925,368 and German Offenlegungsschrift Nos. 2,513,954 and 2,514,019.

This invention relates to new alkenyl and alkinylureido- 7.alpha.-methoxy or desmethoxy cephalosporin derivatives of the formula ##STR4## R represents hydrogen, lower alkyl, phenyl-lower alkyl, diphenyl-lower alkyl, tri(lower alkyl) silyl, trihaloethyl, a salt forming ion, or the group ##STR5## wherein R.sub.5 is hydrogen or lower alkyl and R.sub.6 is lower alkyl. R.sub.1 represents hydrogen or methoxy. The R.sub.1 substituent is in the .alpha.-configuration as indicated by the broken lines (.tbd.).

R.sub.2 represents lower alkenyl or lower alkinyl.

R.sub.3 represents hydrogen or lower alkyl.

R.sub.4 represents hydrogen, lower alkyl, cycloalkyl, cycloalkenyl, cycloalkadienyl, phenyl, phenyl-lower alkyl, substituted phenyl, substituted phenyl-lower alkyl, or certain heterocyclic groups.

X represents hydrogen, lower alkanoyloxy, certain heterothio groups, ##STR6##

When X is pyridinium or carbamoyl substituted pyridinium, the compounds can be structurally represented as having the formula ##STR7## wherein Z is hydrogen or carbamoyl.

The various groups represented by the symbols have the meaning defined below and these definitions are retained throughout this specification.

The lower alkyl groups referred to throughout this specification include straignt or branched chain hydrocarbon groups containing 1 to 8 carbon atoms, preferably 1 to 4 carbons. Examples of the type of groups contemplated are methyl, ethyl, propyl, isopropyl, butyl, t-butyl, etc. The lower alkoxy groups include such lower alkyl groups attached to an oxygen, e.g., methoxy, ethoxy, propoxy, etc. The phenyl-lower alkyl and diphenyl-lower alkyl groups include such lower alkyl groups attached to a phenyl, preferably benzyl, phenethyl, and diphenylmethyl.

The lower alkenyl and lower alkinyl groups referred to throughout this specification include straight or branched chain hydrocarbon groups containing 2 to 8 carbon atoms and one double or triple bond, preferably 2 to 4 carbons. Examples of the types of group contemplated are --CH.sub.2 --CH=CH.sub.2, --CH=CH.sub.2, --CH.sub.2 --CH=CH--CH.sub.3, ##STR8## --CH.sub.2 --C.tbd.CH, --CH.sub.2 --C.tbd.C--CH.sub.3, etc.

Cycloalkyl refers to groups having 3 to 7 carbons in the ring, i.e. cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl. The term cycloalkenyl also represent rings having 3 to 7 carbons with one double bond, i.e. cyclobutenyl, cyclopentenyl, cyclohexenyl, etc. The term cycloalkadienyl represents a ring having 6 or 7 carbons with two double bonds located at various positions such as 1,4-cyclohexadienyl which is preferred.

The substituted phenyl and substituted phenyl-lower alkyl groups include one or two substituents selected from halogen (preferably chlorine or bromine), lower alkyl of 1 to 4 carbons (preferably methyl or ethyl), lower alkoxy of 1 to 4 carbons (preferably methoxy or ethoxy), and hydroxy, e.g. 2-, 3-, or 4-chlorophenyl, 2-, 3-, or 4-bromobenzyl, 2-, 3-, or 4-hydroxyphenyl, 3,5-dichlorophenyl, 2-, 3-, or 4-methylphenyl, 2-, 3-, or 4-ethoxyphenyl, etc.

The salt forming ions represented by R may be metal ions, e.g., aluminum, alkali metal ions such as sodium or potassium, alkaline earth metal ions such as calcium or magnesium, or an amine salt ion, of which a number are known for this purpose, for example, phenyl-lower alkylamines such as dibenzylamine, N,N-dibenzylethylenediamine, lower alkylamines such as methylamine, triethylamine, and N-lower alkylpiperidines such as N-ethylpiperidine. Sodium and potassium are the preferred salt forming ions.

The halogens are the four common halogens, of which chlorine and bromine are preferred. In the case of the trihaloethyl group represented by R,2,2,2-trichloroethyl is preferred.

Trimethylsilyl is the preferred tri(lower alkyl) silyl group.

The heterocyclic groups represented by R.sub.4 are 2-thienyl, 3-thienyl, 2-furyl, 3-furyl, 2-pyridyl, 3-pyridyl, or 4-pyridyl. Also included within the meaning of R.sub.4 are such heterocyclics having a halogen (preferably Cl or Br) or a lower alkyl of 1-4 carbons (preferably methyl or ethyl) substituent, i.e. 2-(4-chlorothienly), 3-(4-methylthienyl), etc.

Lower alkanoyloxy refers to a group of the formula ##STR9## wherein lower alkyl is of 1 to 4 carbons, preferably wherein lower alkyl is methyl.

The heterothio groups represented by X are ##STR10## wherein R.sub.7 is hydrogen or lower alkyl of 1 to 4 carbons (preferably methyl or ethyl) and R.sub.8 is hydrogen, lower alkyl of 1 to 4 carbons (preferably methyl or ethyl), methoxy, hydroxy, or halogen (preferably chlorine).

The desmethoxy compounds of formula I (R.sub.1 is hydrogen) can be prepared by several methods. For example, an .alpha.-amino intermediate of the formula ##STR11## wherein X is hydrogen, lower alkanoyloxy, or heterothio can be reacted, preferably in the form of its trifluoroacetic acid salt, with a compound of the formula

The .alpha.-amino intermediate of formula II can be prepared by various methods such as by acylating a 7-amino cephalosporin of the formula ##STR13## with a substituted .alpha.-amino acid of the formula ##STR14## wherein Y is a protecting group such as ##STR15## The .alpha.-amino protecting group is then removed by treating the resulting cephalosporin with trifluoroacetic acid and anisole. The .alpha.-amino compounds of formula II are taught in various U.S. patents as for example, U.S. Pat. Nos. 3,485,819; 3,507,861; 3,641,021; 3,796,801; 3,813,388; 3,821,207; etc.

Similarly, the 7.alpha.-methoxy compounds of formula I (R.sub.1 is methoxy) wherein X is hydrogen, lower alkanoyloxy, or heterothio can be prepared by reacting an .alpha.-amino intermediate of the formula ##STR16## preferably in the form of its trifluoroacetic acid salt with a compound of formula III, IV, or V.

The 7.alpha.-methoxy intermediate of formula VIII can be prepared in an analogous manner to the compound of formula II, i.e. by acylating a 7.alpha.-methyl-7.beta.-amino-cephalosporin of the formula ##STR17## with a substituted .alpha.-amino acid of formula VII followed by removal of the protecting group. The compounds of formula IX are taught in U.S. Pat. No. 3,897,424 and the preparation of the compound of formula VIII by various other methods are taught in U.S. Pat. Nos. 3,775,410; 3,780,031; 3,780,033; 3,780,034; 3,780,037; 3,887,549; etc.

The compound of formula I wherein R.sub.1 is either hydrogen or methoxy and X is pyridinium or carbamoyl substituted pyridinium are prepared by reacting the compound of the formula ##STR18## with pyridine or carbamoyl substituted pyridine in a polar solvent such as water and in the presence of a catalyst such as an alkali metal thiocyanate. U.S. Pat. No. 3,792,047 and German Offenlegungsschrift No. 2,234,280 both disclose methods for reacting a cephalosporin so as to replace an acetoxy group with a pyridinium group.

Also, the compounds of formula I wherein R.sub.1 is either hydrogen or methoxy and X is heterothio can be prepared by reacting the compound of formula Ib with a mercaptan of the formula

or an alkali metal (preferably sodium) mercaptan salt of the formula

methods for displacing the acetoxy group of a cephalosporin by a heterothio group are taught in various U.S. patents including U.S. Pat. Nos. 3,855,213; 3,890,309; 3,892,737; etc.

The compounds of formula I wherein X is hydrogen, lower alkanoyloxy, or heterothio can also be prepared by reacting a compound of the formula ##STR19## with an ester, preferably R is diphenylmethyl, of the compound of formula VI or IX in the presence of hydroxybenzotriazole. The resulting ester is then treated according to methods known in the art to yield the corresponding compound of formula I wherein R is hydrogen.

The compound of formula XII can be prepared by reacting the isocyanatoacetic acid ester of the formula ##STR20## with the compound of the formula ##STR21##

The compounds of formula I wherein R is lower alkyl, phenyl-lower alkyl, trihaloethyl, diphenyl-lower alkyl, or the acyloxymethyl group ##STR22## may be obtained by reacting the 7-amino cephalosporin of formula VI or IX either before or after the acylation of the 7-amino substituent with one or two moles of a compound of the formula

or

wherein halo is preferably chlorine or bromine in an inert solvent such as dimethylformamide, acetone, dioxane, benzene, or the like at about ambient temperature or below.

Similarly, the compounds of formula I wherein R is tri(lower alkyl) silyl are obtained by introducing such groups onto the cephalosporanic acid moiety either before or after the acylation reaction.

The carboxylate salts of the compound of formula I are formed by reacting the carboxyl group of the cephalosporanic acid moiety, i.e. R is hydrogen, with any of the salt forming ions described above.

It will be appreciated that the compounds of formula I are optically active due to the presence of an asymmetric carbon atom represented as C* in the preceding formulas. By selection of the appropriate starting material it is possible to obtain the compounds of formula I as a mixture of optically active isomers or isolated as a single isomer. The various isomers as well as their mixtures are within the scope of this invention.

Preferred compounds of this invention are the acids and alkali metal salts of formula I (i.e. R is hydrogen, sodium, or potassium) wherein X is pyridinium, carbamoyl substituted pyridinium (particularly where the carbamoyl group is in the 4-position), or heterothio; R.sub.4 is cyclohexenyl, cyclohexadienyl, phenyl, benzyl, phenethyl, substituted phenyl, benzyl, or phenethyl wherein the substituent is on the phenyl ring and is one or two members selected from chloro, bromo, methyl, ethyl, methoxy, ethoxy and hydroxy, or a substituted or unsubstituted heterocyclic selected from 2-thienyl, 3-thienyl, 2-furyl, 3-furyl, 2-pyridyl, 3-pyridyl and 4-pyridyl wherein the heterocyclic substituent is chloro, bromo, methyl, or ethyl; R.sub.2 is straight or branched chain alkenyl or alkinyl of 2 to 4 carbons; and R.sub.3 is hydrogen or straight or branched chain alkyl of 1 to 4 carbons.

Also preferred as both final products and intermediates are the compounds of formula I wherein X is ##STR23## and R.sub.2, R.sub.3, and R.sub.4 are as defined above.

The most preferred final compounds are the acids and alkali metal salts of formula I wherein R.sub.4 is 2-thienyl, 3-thienyl, phenyl, or 4-hydroxyphenyl; X is heterothio, particularly wherein X is ##STR24## and R.sub.2 is straight or branched chain alkenyl of 2 to 4 carbons.

The acid compounds of formula I have a broad spectrum of antibacterial activity against both gram positive and gram negative organisms such as Staphylococcus aureus, Salmonella schottmuelleri, Proteus rettgeri, Escherichia coli, Enterobacter cloacae, Klebsiella pneumoniae, etc. They may be used as antibacterial agents in a prophylactic manner, e.g., in cleaning or as surface disinfecting compositions, or otherwise to combat infections due to organisms such as those named above, and in general may be utilized in a manner similar to cephalothin and other cephalosporins. For example, a compound of formula I or a physiologically acceptable salt thereof may be used in various animal species in an amount of about 1 to 100 mg./kg., daily, orally or parenterally, in single or two to four divided doses to treat infections of bacterial origin, e.g., 5.0 mg./kg. in mice.

Up to about 600 mg. of an acid compound of formula I or a physiologically acceptable salt thereof may be incorporated in an oral dosage form such as tablets, capsules or elixirs or in an injectable form in a sterile aqueous vehicle prepared according to conventional pharmaceutical practice.

They may also be used in cleaning or disinfecting compositions, e.g., for cleaning barns or dairy equipment, at a concentration of about 0.2 to 1% by weight or such compounds admixed with, suspended or dissolved in conventional inert dry or aqueous carriers for application by washing or spraying.

They are also useful as nutritional supplements in animal feeds.

Illustrative process details are provided in the examples for the various reactions. All temperatures are on the centigrade scale.

(a) D-.alpha.-[[(2-Propenylamino)carbonyl]amino]-2-thiopheneacetic acid, 4-nitrophenyl ester

To a solution of 0.01 mole of D-.alpha.-isocyanato-2-thiopheneacetic acid, 4-nitrophenyl ester in 20 ml. of tetrahydrofuran is added dropwise at room temperature over 30 minutes a solution of 0.63 g. of 2-propen-1-amine in 10 ml. of tetrahydrofuran. The mixture is stirred for one hour. After concentrating the solution and treating the residue with ether, 3.4 g. of D-.alpha.-[[(2-propenylamino)carbonyl]amino]-2-thiopheneacetic acid, 4-nitrophenyl ester are obtained as an amorphous powder; m.p. 98.degree.-102.degree..

(b) 7.beta.-Amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-a zabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

To a stirred suspension of 27.2 g. 7-amino cephalosporanic acid (0.1 mole) in 150 ml. of acetone and 100 ml. of H.sub.2 O at 0.degree.-5.degree. is added 50 ml. of 2N NaOH, with care being taken to keep the pH below 8.5. A solution of 12.7 g. (0.11 mole) of 1-methyl-5-mercapto-1H-tetrazole in 50 ml. of 2N NaOH is added, and the mixture is allowed to warm to room temperature. The stirred mixture is then maintained at 60.degree. (internal temperature) under nitrogen for 3 hours at pH 7-7.5 by the periodic addition of dilute aqueous NaOH. The mixture is cooled in an ice-water bath, and while stirring, 3N HCl is added to adjust the pH to 3.9. Stirring is continued for 15 minutes, and the precipitate is collected by filtration, washed with water, and then acetone, and finally dried to give the desired product as a powder (18.4 g.).

(c) 7.beta.-Amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-a zabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester

A mixture of 16.4 g. (0.05 mole) of the acid product from part (b), 10.3 g. (0.054 mole) p-toluenesulfonic acid monohydrate, 350 ml. of dioxane (dried by passage through basic alumina), and dry CH.sub.3 OH is stirred at room temperature under nitrogen for 30 minutes. The clear solution is evaporated to a residue, and H.sub.2 O and CH.sub.3 OH are removed by four evaporations of 100 ml. quantities of dioxane. Fresh dioxane (300 ml.) is then added to the residue followed by a solution of crystalline diphenyldiazomethane (19.4 g., 0.10 mole) in 150 ml. of dry dimethoxyethane. The mixture is initially shaken vigorously for 10-15 minutes and then stirred at room temperature for 3 hours. Methanol (25 ml.) is added, and the red solution is stirred until it has turned yellow-orange. The solvents are removed in vacuo, and the residue is treated with 400 ml. of CH.sub.2 Cl.sub.2 and a solution of 20 g. of K.sub.2 HPO.sub. 4 in 250 ml. of H.sub.2 O. The CH.sub.2 Cl.sub.2 layer is washed with water and saturated NaCl, and finally dried (MgSO.sub.4) to give a residue after removal of the solvent in vacuo. Treatment of the residue with Et.sub.2 O gives a solid (27 g.). Column chromatography of this solid on silica gel by elution with CHCl.sub.3 and then EtOAc--CHCl.sub.3 (4:1) provides the desired product as a residue (12.9 g.). Treatment with EtOAc then provides 8.0 g. of the desired product as a pale yellow powder.

(d) 7.beta.-[[D-[[(2-Propenylamino)carbonyl]amino]-2-thienylacetyl]-amino]-3-[ [(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oc t-2-ene-2-carboxylic acid, diphenylmethyl ester

1.48 g. (0.003 mole) of 7.beta.-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-a zabicyclo[4.2.0]-oct-2-ene-2-carboxylic acid, diphenylmethyl ester from part (c) are dissolved in 20 ml. of methylene chloride and a solution of 1.15 g. (0.0035 mole) of D-.alpha.-[[(2-propenylamino)carbonyl]-amino]-2-thiopheneacetic acid, 4-nitrophenyl ester from part (a) in 10 ml. of N,N-dimethylacetamide is added. After the addition of 0.49 g. (0.003 mol.) of hydroxybenzotriazole, the solution is stirred overnight at room temperature. The reaction solution is diluted with 250 ml. of ethylacetate, washed with sodium bicarbonate solution and with water, dried with magnesium sulfate and concentrated in vacuum. The residue is triturated with ether and filtered under suction to obtain 1.5 g. of 7.beta.-[[D-[[(2-propenylamino)carbonyl]amino]-2-thienyl-acetyl]amino]-3-[ [(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1 -azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester as a yellow-brown amorphous powder; m.p. 116.degree..

(e) 7.beta.-[[D-[[(2-Propenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[ (1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct -2-ene-2-carboxylic acid

1.6 g. of the diphenylmethyl ester product from part (d) is reacted with 10 ml. of anisole and 17 ml. of trifluoroacetic acid at 0.degree.-5.degree. for 10 minutes to obtain 1.2 g. of 7.beta.-[[D-[[(2-propenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[ (1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo-[4.2.0]oc t- 2 -ene-2-carboxylic acid as a yellow-brown powder; m.p. 120.degree. (dec.).

An aqueous equimolar solution of this acid and sodium bicarbonate is lyophilized to yield 7.beta.-[[D-[[2-propenylamino)-carbonyl]amino]-2-thienylacetyl]amino]-3-[[ (1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct -2-ene-2-carboxylic acid, sodium salt; m.p. 160.degree.-163.degree. (dec.).

In an analogous manner, by substituting L-.alpha.-isocyanato- 2-thienylacetic acid, 4-nitrophenyl ester for the D-isomer in part (a) and then following the procedure of Example 1, one obtains 7.beta.-[[L-[[(2-propenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[ (1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct -2-ene-2-carboxylic acid and its sodium salt.

(a) 7.alpha.-Methoxy-7.beta.-[[D-[[(2-propenlyamino)carbonyl]amino]-2-thienyla cetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]-methyl]-8-oxo-5-thia-1-az abicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester

D-.alpha.-[[(2-Propenylamino)cabonyl]amino]-2-thiopheneacetic acid, 4-nitrophenyl ester from example 1(a) and 7.alpha.- methoxy-7.beta.-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5- thia-1-azabicyclo4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester are reacted according to the procedure of example 1 (d) to yield 7.alpha.-methoxy-7.beta.-[[D-[[(2-propenylamino)- carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio ]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-caraboxylic acid, diphenylmethyl ester.

(b) 7.alpha.-Methoxy-7.beta.-[[D-[[(2-propenylamino)carbonyl]amino]-2-thienyla cetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-aza bicyclo[4.2.0]oct-2-ene-2-carboxylic acid

The diphenylmethyl ester product from part (a) is treated with anisole and trifluoroacetic acid according to the procedure of example 1 (e) to yield 7.alpha.-methoxy-7.beta.-[[D-[[(2-propenylamino)carbonyl]amino]-2-thienyla cetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-aza bicyclo[4.2.0]oct-2-ene-2-carboxylic acid.

An aqueous equimolar solution of this acid and sodium bicarbonate is lyophilized to yield 7.alpha.-methoxy-7.beta.-[[D-[[(2-propenylamino)carbonyl]amino]-2-thienyla cetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-aza bicyclo[4.2.0]oct-2-ene-2-carboxylic acid, sodium salt.

In an analogous manner one can obtain, 7.alpha.-methoxy-7.beta.- [[L-[[(2-propenylamino)carabonyl]amino]-2-thienylacetyl]amino ]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4. 2.0]oct-2-ene-2-caboxylic acid and its sodium salt.

Following the procedure of example 1 but employing the isocyanato compound of Col. I and the amine of Col. II one obtains the nitrophenyl ester of Col. III. The ester of Col. III and the 7.beta.-amino-7.alpha.-methoxy or desmethoxy-cephalosporanic acid ester of Col. IV are reacted to yield the acylated cephalosporanic acid ester of Col. V. The ester of Col. V can be treated to remove the ester protecting group and yield the cephalosporanic acid of Col. VI which can be converted by known means to yield the corresponding salt. ##STR25##

The isocyanato compounds of Col. I may be in either the D- or L- form or may be a mixture of the D- and L- isomers.

(a) D-2-[[[(4-Methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid

74 g. of D-2-Thienylglycine are dissolved in 940 ml. of water. 37.8 g. of magnesium oxide are added and to this resulting suspension a solution of 107.5 g. of p-methoxybenzyloxycarbonylazide in 940 ml. of dioxane is added with stirring. The mixture is stirred at room temperature for 24 hours. It is then filtered and the filtrate is extracted with 600 ml. of ether. The extract is discarded. The water is dioxane phase is layered over with 600 ml. of ethyl acetate, cooled to 5.degree. and brought to pH 2 with 2N hydrochloric acid. The layers are separated and the aqueous layer is again extracted with 300 ml. of ethyl acetate. The combined ethyl acetate extracts are washed with water, dried with magnesium sulfate, filtered and concentrated. The oily residue crystallizes upon trituration with petroleum ether to yield 118 g. of D-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid; m.p. 84.degree.-94.degree.; [.alpha.].sub.20.sup. D : - 69.degree. (c=1, tetrahydrofuran).

(b) 7.beta.-[[D-[[[(4-Methoxyphenyl)methoxy]carbonyl]amino]-2-thienylacetyl]am ino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester

46.2 g. of 7.beta.-amino-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-a zabicyclo[4.2.0.]oct-2-ene-2carboxylic acid, diphenylmethyl ester from example 1(c) are dissolved in 550 ml. of anhydrous methylene chloride. 550 ml. of tetrahydrofuran and 36 g. of D-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid, from part (a), are added. The reaction solution is cooled to 0.degree. and a solution of 22.5 g. of dicyclohexylcarbodiimide in 150 ml. of anhydrous tetrahydrofuran is added dropwise over the course of 30 minutes. The mixture is then stirred for 90 minutes at 0.degree. and finally 120 minutes at room temperature. The precipitated dicyclohexylurea (21 g.) is filtered off under suction and the filtrate is concentrated. The residue is taken up in a mixture of 1000 ml. of ethyl acetate and 400 ml. of tetrahydrofuran, filtered and the filtrate is washed first with sodium bicarbonate solution and then with water. This is then dried with magnesium sulfate, treated with activated carbon, filtered and the filtrate is then concentrated slowly under vacuum to a small volume. After standing overnight in the refrigerator, the precipitate crystals are filtered under suction to obtain 63.1 g. of 7.beta.-[[D-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thienylacetyl]am ino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester; m.p. 130.degree.-131.degree. (dec.). [.alpha.].sub.20.sup. D : -117.degree. (c=1, tetrahydrofuran).

(c) 7.beta.-[D-2-Amino-2-(2-thienyl)acetamido]-3-[[(1-methyl-1H-tetrazol-5-yl) thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, trifluoroacetic acid salt (1:1)

62 g. of the diphenylmethyl ester product from part (b) are added to 300 ml. of anisole with stirring. The mixture is cooled to 0.degree. and 750 ml. of trifluoroacetic acid are added slowly. The mixture is stirred for 10 minutes at 0.degree. and the anisole is evaporated at 0.1 mm. of Hg. and 35.degree. bath temperature. The residue is treated with 250 ml. of petroleum ether, then 350 ml. of ether, stirred for one hour, and filtered with suction to yield 46.4 g. of 7.beta.-[D-2-amino-2-(2-thienyl)acetamido]-3-[[(1-methyl-1H-tetrazol-5-yl) thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, trifluoroacetic acid salt (1:1); m.p. 138.degree.-139.degree. (dec.).

(d) 7.beta.-[[D-[[(Ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1- methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2- ene-2-carboxylic acid

0.01 mole of the trifluoroacetic salt product from part (c) are suspended in methylene chloride and 0.02 mole of triethylamine are added. To the almost clear solution is added dropwise at 0.degree.-5.degree., 0.012 mole of a solution of isocyanatoethene and methylene chloride. After stirring for one hour, the reaction solution is concentrated, the residue is dissolved in water, filtered, and acidified with 2N hydrochloric acid to yield as a precipitate, 7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1- methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2- ene-2-carboxylic acid.

An aqueous equimolar solution of this acid and sodium bicarbonate is lyophilized to yield 7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1- methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2- ene-2-carboxylic acid, sodium salt.

In an analogous manner by substituting L-2-thienylglycine for the D-isomer in part (a) and then following the procedure of example 51, one obtains 7.beta.-[[L-[[(ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[(1- methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2- ene-2-carboxylic acid and its sodium salt.

(a) 7.alpha.-Methoxy-7.beta.-[[D,L-[[[(4-methoxyphenyl)methoxy]carbonyl]amino] -2-thienylacetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5 -thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester

2.41 g. (0.0075 mole) of D,L-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid (prepared according to the procedure of example 51 (a)) is dissolved in 50 ml. of dry methylene chloride, the solution is cooled in an ice bath to 0.degree.- 5.degree., and 0.969 g. (0.0075 mole) of diisopropylethylamine and isobutylchloroformate are added to the cold solution. After 10 minutes, 3.28 g. (0.00625 mole) of 7.beta.-amino-7.alpha.-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl] -8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester is added to the reaction mixture and the ice bath is removed. Following three hours of stirring at room temperature, a second portion of mixed anhydride is prepared in a separate flask using the procedure described above. This solution is added to the reaction mixture and after 4.5 hours another batch of mixed anhydride prepared using half the quantities set forth above is added to the main reaction mixture. Stirring is continued at room temperature for 12 hours and the reaction mixture is then diluted with methylene chloride and washed with water, saturated aqueous sodium bicarbonate solution, and water. The organic layer is dried over sodium sulfate and the solvent is removed in vacuo to yield a foam. This crude product is chromatographed on silica gel (200 g., 60-200 mesh) and the desired product is eluted with 9:1 and 4:1 methylene chloride:ethyl acetate. The oily product is precipitated as a powder from a methylene chloride-ether mixture and dried over phosphorous pentoxide in vacuo to yield 3.81 g. of 7.alpha.-methoxy-7.beta.-[[D,L-[[[(4-methoxyphenyl)methoxy]carbonyl]amino] -2-thienylacetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5 -thia-1-azabicyclo[4.2.0]oct- 2-ene-2-carboxylic acid, diphenylmethyl ester. Alternatively, the titled compound can be obtained by the following procedure.

129 mg. (0.4 mmole) of D,L-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid is dissolved in 2 ml. of anhydrous methylene chloride and 47 mg. (0.2 mmole) of dicyclohexylcarbodiimide is added. The mixture is stirred for 15 minutes at room temperature during which time colorless dicyclohexylurea crystallizes. The suspension is directly filtered into a stirring solution of 77 mg. (0.147 mmole) of 7.beta.-amino-7.alpha.-methoxy-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl] -8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester in 1 ml. of methylene chloride. After stirring at room temperature for 19 hours, the mixture is diluted with methylene chloride, washed with pH 7.4 buffer, and dried over sodium sulfate. Removal of solvent under reduced pressure yields a crude oil which is chromatographed on preparative thin layer chromatography silica gel plates developed in a 4:1 chloroform:ethyl acetate mixture. The desired product (58 mg.) is isolated as an oil.

(b) 7.alpha.-Methoxy-7.beta.-[D,L-2-amino-2-(2-thienyl)acetamido]-3-[[(1-methy l-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2 -carboxylic acid, trifluoroacetic acid salt (1:1)

The diphenylmethyl ester product from part (a) is reacted with trifluoroacetic acid in the presence of anisole according to the procedure of example 51(c) to yield the titled compound.

(c) 7.alpha.-Methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl]amino]-2-thienylac etyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azab icyclo[4.2.0] oct-2-ene-2-carboxylic acid

The trifluoroacetic acid salt product from part (b) is reacted with isocyanatoethene according to the procedure of example 51(d) to yield 7.alpha.-methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl]amino]-2-thienylac etyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azab icyclo[4.2.0]oct-2-ene-2-carboxylic acid.

An aqueous equimolar solution of this acid and sodium bicarbonate is lyophilized to yield 7.alpha.-methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl]amino]-2-thienylac etyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1 -azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, sodium salt.

Following the procedure of example 51 but employing the acylating agent shown in Col. I and the 7.beta.-amino-7.alpha.-methoxy or desmethoxy-cephalosporanic acid ester shown in Col. II, one obtains the protected ester shown in Col. III. The protecting group and ester group are removed as the compound of Col. III is converted to its trifluoroacetic acid salt shown in Col IV. The trifluoroacetic acid salt is reacted with the isocyanato compound of Col. V to yield the cephalosporanic acid shown in Col. VI. The acid of Col. VI can be reacted so as to reintroduce the ester group and yield the compound of Col. VII or can be treated according to known procedures to yield the corresponding salt. ##STR190##

Alternatively, the .alpha.-aminocephalosporanic acid ester of Col. VIII can be treated with the compound of Col. V to yield the ester of Col. VII. This ester can then be treated to remove the ester group and yield the cephalosporanic acid of Col. VI. ##STR191##

(a) 3-[(Acetyloxy)methyl-7.beta.-[D-[[[(4-methoxyphenyl)methoxy]carbonyl]amino ]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carbox ylic acid

3.2 g. (0.01 mole) of the D-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid from example 51(a) are brought into solution in 40 ml. of methylene chloride with 1.1 ml. of N-methylmorpholine. The solution is cooled to -15.degree., 1.39 ml. of isobutylchloroformate are added, and the mixture is stirred for 10 minutes. To this is added a solution of 3.26 g. (0.1012 mol) of 7-aminocephalosporanic acid and 3.1 ml. of triethylamine in 140 ml. of methylene chloride. The mixture is stirred for 1 hour at -5.degree. and 1 hour at 5.degree.. This mixture is then evaporated to dryness in a rotary evaporator. The solid residue is triturated with ether and filtered under suction. The substance is then dissolved in ice water, layered over with ethyl acetate and acidified to pH 2.5. The layers are separated, the aqueous layer is extracted once more with ethyl acetate, the combined ethyl acetate extracts are washed with water, dried with magnesium sulfate and concentrated. The residue (4.9 g.) is dissolved in 200 ml. of ethyl acetate and the solution is treated with activated carbon. After filtration, 2 g. of 3-[(acetyloxy)methyl]7.beta.[[D-[[[(4-methoxyphenyl)methoxy]carbonyl]amino ]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carbox ylic acid, crystallize; m.p. 142.degree.-143.degree. (dec.).

(b) 3-[(Acetyloxy)methyl]-7.beta.-[D-2-amino-2-(2-thienyl)acetamido]-8-oxo-5-t hia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, trifluoroacetic acid salt (1:1)

2.0 g. of the product from part (a) are added at -5.degree. to a mixture of 10 ml. of trifluoroacetic acid and 4 ml. of anisole. The mixture is stirred for 10 minutes and is then concentrated in a rotary evaporator. The residue is treated with ether and filtered to yield the titled compound.

(c) 3-[(Acetyloxy)methyl]-7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thieny lacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, sodium salt

The trifluoroacetic acid salt product from part (b) is treated with isocyanatoethene according to the procedure of example 51(d) to yield 3-[(acetyloxy)methyl]-7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thieny lacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid.

An equimolar aqueous solution of this compound and sodium bicarbonate is lyophilized to yield 3-[(acetyloxy)methyl]-7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thieny lacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid, sodium salt as a powder.

(d) 7.beta.-[[D-[[(Ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-2-thien ylacetyl]amino]- 3-[[4-(aminocarbonyl)pyridino]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct- 2-ene-2-carboxylic acid

A mixture of 0.0005 mole of the sodium salt product of part (c), 0.0075 mole of 4-pyridinecarboxamide, 12 g. of potassium thiocyanate, and 7.5 ml. of water are heated at 50.degree. for 24 hours. The clear solution is passed through a chromatography column filled with 150 g. of ion exchanger Amberlite XAD-2. The column is washed with about 3 liters of water and the titled compound is eluted with a mixture of water:methanol (8:2). The methanol is evaporated from the eluate and the aqueous solution is lyophilized. The amorphous residue is triturated with ether and filtered under suction to yield 7.beta.-[[D-[[(ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[4-( aminocarbonyl)pyridino]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2- carboxylic acid.

Similarly, by employing the L-2-[[[(4-methoxyphenyl)methoxy]carbonyl]amino]-2-thiopheneacetic acid in place of the D-isomer in the above procedure, one obtains 7.beta.[[L-[[(ethenylamino)carbonyl]amino]-2-thienylacetyl]amino]-3-[[4-(a minocarbonyl)pyridino]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-c arboxylic acid.

Following the procedures of example 78, but employing the cephalosporanic acid sodium salt shown below in Col. I and the pyridine compound shown in Col. II, one obtains the product shown in Col. III. ##STR269##

The cephalosporanic acid sodium salts shown above in Col. I may be in the D- or L-isomer form or a mixture of D- and L- isomers.

0.003 mole of 3-[(acetyloxy)methyl]-7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl] amino]-8-oxo-5-thia-1 -azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, sodium salt from example 78 (c) and 0.004 mole of 2-mercaptopyridine, 1-oxide, sodium salt are dissolved in 15 ml. of water and heated overnight at 50.degree.. The reaction mixture is then diluted with water, filtered, and the clear solution is adjusted to a pH of 2 by the addition of 2N hydrochloric acid. The resulting precipitate is filtered under suction to obtain 7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(1-oxo-2-pyridinyl)thio]methyl]-8-oxo-5- thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid.

Following the same procedure but employing 3-[(acetyloxy)methyl]-7.beta.-[[L-[[(ethenylamino(carbonyl] amino]-2-thienylacetyl]-amino]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, sodium salt, one obtains the corresponding final product in the L- form.

Similarly, the various 3-[(acetyloxy)methyl- 7.alpha.-methoxy or desmethoxy-7.beta.-acylureido-cephalosporanic acid sodium salts shown in Col. I of examples 79 to 93 may be employed in the procedure of example 94 to obtain other 3-[[(1-oxo-2-pyridinyl)thio] methyl]-cephalosporins within the scope of the invention.

3-[(Acetyloxy)methyl] -6.beta.-[[D-[[(ethenylamino)carbonyl] -amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[ 4.2.0] -oct-2-ene-2-carboxylic acid, sodium salt from example 78 (c) is dissolved in a mixture of acetone:water (1:1). 1-Oxopyridazine-3-thiol, sodium salt is added under nitrogen and the solution is heated for several hours at 60.degree.. The solution is diluted with 150 ml. of water and acidified to pH 5 by the addition of 2N hydrochloric acid while cooling. A precipitate forms which is filtered under suction to yeild 7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(1-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid.

Following the same procedure but employing 3-[(acetyloxy)methyl] -7.beta.-[[L-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[ 4.2.0.]oct-2-ene-2-carboxylic acid, sodium salt, one obtains the corresponding final product in the L-form.

Following the procedure of example 95 but substituting for the 1-oxopyridazine-3-thiol one of the following:

2-oxopyridazine-3-thiol

6-methyl-1-oxopyridazine-3-thiol

6-methoxy-1-oxopyridazine-3-thiol

6-t-butyl-2-oxopyridazine-3-thiol

6-ethyl-2-oxopyridazine-3-thiol

6-hydroxy-1-oxopyridazine-3-thiol

6-hydroxy-2-oxopyridazine-3-thiol

6-chloro-1-oxopyridazine-3-thiol

6-chloro-2-oxopyridazine-3-thiol

one obtains:

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(2-oxopyridazin-3-yl)thio] methyl]-8-oxo-5thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3[[(6-methyl-1-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-methoxy-1-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-t-butyl-2-oxopyridazin-3yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-ethyl-2-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-hydroxy-1-oxopyridazin-3-yl)thio]meth yl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-hydroxy-2-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid,

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-choloro-1-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, and

7.beta.-[[D-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(6-chloro-2-oxopyridazin-3-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, respectively.

Similarly, by employing 3-[(acetyloxy)methyl] -7.beta.-[[L-[ [(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, sodium salt in place of the D-isomer in examples 95 to 104, the corresponding final products in the L-isomer form are obtained. Additionally, the various 3-[(acetyloxy)methyl] -7.alpha.-methoxy or desmethoxy-7.beta.-acylureido-cephalosporanic acid sodium salts shown in Col. I of examples 79 to 93 may be employed in the procedure of examples 95 to 104 to obtain other compounds within the scope of the invention.

(a) [(Acetyloxy)methyl] -7.alpha.-methoxy-7.beta.-[[D,L-[[[(4-methoxyphenyl)methoxy] carbonyl]amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct -2-ene-2-carboxylic acid, diphenylmethyl ester

D,L-2-[[[(4-Methoxyphenyl)metoxy] carbonyl]amino]-2-thiopheneacetic acid and 3-[(acetyloxy)methyl] -7.alpha.-methoxy-7.beta.-amino-8-oxo-5-thia-1-azabicyclo[ 4.2.0]oct-2-ene-2-carboxylic acid, diphenylmethyl ester are reacted according to either of the procedures set forth in example 52(a) to yield the titled compound.

(b) 3-[(Acetyloxy)methyl] -7.alpha.-methoxy-7.beta.-[D,L-2-amino-2-(2-thienyl)acetamido] -8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2carboxylic acid, trifluoroacetic acid salt (1:1)

The diphenylmethyl ester product from part (a) is reacted with trifluoroacetic acid in the presence of anisole according to the procedure of example 1(e) to yield the titled compound.

(c) 3-[(Acetyloxy)methyl]-7.alpha.-methoxy-7.beta.-[[D,L-[[(ethenylamino)carbo nyl]amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo [ 4.2.0]oct-2-carboxylic acid

The trifluoroacetic acid salt product from part (b) is treated with isocyanatoethene according to the procedure of example 51(d) to yield 3-[(acetyloxy)methyl] -7.alpha.-methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-carbox ylic acid.

(d) 7.alpha.-Methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino]-3-[[(1-methyl-1H-tetrazol-5-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

The product from part (c) is dissolved in a mixture of acetone:water (1:1) with the aid of 5N sodium hydroxide. The pH is adjusted to 7.6-8.0 and 5mmol. of 1-methyl-1H-tetrazole-5-thiol is added. The pH is maintained at 7.8 by the addition of 5N sodium hydroxide. The reaction mixture is heated at 50.degree. to 60.degree. for several hours. After cooling and distilling off the acetone, the mixture is acidified to pH 2.5 by the addition of 2N hydrochloric acid while cooling with ice. The resulting precipitate is extracted with ethyl acetate to yield 7.alpha.-methoxy-7.beta.-[[D,L-[[(ethenylamino)carbonyl] amino]-2-thienylacetyl]amino] -3-[[(1-methyl-1H-tetrazol-5-yl)thio] methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid.

Following the procedure of example 105 but employing the 3[(acetyloxy)methyl] -7.alpha.-methoxy or desmethoxy-7.beta.-acylureido cephalosporanic acid shown below in Col. I and the heteromercaptan shown below in Col. II, one obtains the 3-heterothio compounds shown in Col. III. ##STR300##

The 3-[(acetyloxy)methyl] -cephalosporanic acids of Col. I above may be in either the D- or L- isomer form or may be a mixture of the D- and L- isomers.