Patent ZA-857342-B (ZA)
Title: Cephalosporin derivatives,process for their preparation and their application as antibiotics
Inventor: OLLIERO DOMINIQUE
IPC: C07D501/46
Filed: 1985-09-24
Abstract: For the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE 1. Cephalosporin derivatives of general formula :   see diagramm : EP0178980,P46,F1   in which : - X is an oxygen atom or a sulfur atom - n is zero, 1 or 2, - R1 , R2  and R3  each designate, a hydrogen atom or else - R1  and R2  designate a hydrogen atom or a methyl group, and R3  designates a carboxyl or cyclopropyl group or else - R1  and R2  taken together with the carbon atom to which they are linked form a cyclobutyl or cyclopentyl group and R3  is a carboxyl group, - B is the residue of a primary or secondary amine selected from the following groups : - Z-NH2  where Z is an alkylene group with a straight or branched chain having from 2 to 7 carbon atoms, possibly interrupted by a sulfur atom, or else Z is a 1,3-cyclohexylene or 1,4-cyclohexylene group, - Z'-Alk-NH-R where Z' is a 1,2-phenylene or 1,3-phenylene or 1,4-phenylene group possibly substituted by 1, 2 or 3 methyl groups or else Z' is 1,2-cyclohexylene, 1,3-cyclohexylene or 1,4-cyclohexylene group. Alk is a straight or branched alkylene group having from 1 to 3 carbon atoms, possibly interrupted by a sulfur atom, R is a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms,   see diagramm : EP0178980,P46,F2   where Z'' is a 1,3-phenylene or 1,4-phenylene group, Y is an alkylene group (CH2 )m  in which m = 1, 2 or 3, R' is hydrogen or methyl and R is as defined above, - Z''-CO-NH-Y-NH2  where Z'' and Y are as defined above, - Z''-Y'-NH-CO-Y-NH2  where Z'' and Y are as defined above and Y' is a straight or branched alkylene group with 1 or 2 carbon atoms,   see diagramm : EP0178980,P47,F3   where n = 0 or 1 and Y is as defined above, - a 2-piperidyl, 3-piperidyl or 4-piperidyl group possibly substituted on the nitrogen atom by a -CO-Y-NH2  group where Y is as defined above, - a group   see diagramm : EP0178980,P47,F4   - the bicyclic group   see diagramm : EP0178980,P47,F5   as well as the pharmaceutically acceptable salts and esters thereof. For the Contracting State : AT 1. Process for the preparation of the cephalosporin derivatives of general formula :   see diagramm : EP0178980,P49,F1   in which : - X is an oxygen atom or a sulfur atom - n is zero, 1 or 2 - R1 , R2  and R3  each designate, a hydrogen atom or else - R1  and R2  designate a hydrogen atom or a methyl group, and R3  designates a carboxyl or cyclopropyl group or else - R1  and R2  taken together with the carbon atom to which they are linked from a cyclobutyl or cyclopentyl group and R3  is a carboxyl group, - B is the residue of a primary or secondary amine selected by the following groups : - Z-NH2  where Z is an alkylene group with a straight or branched chain having from 2 to 7 carbon atoms, possibly interrupted by a sulfur atom, or else Z is a 1,3-cyclohexylene or 1,4-cyclohexylene group, - Z'-Alk-NH-R where Z' is a 1,2-phenylene or 1,3-phenylene or 1,4-phenylene group possibly substituted by 1, 2 or 3 methyl groups or else Z' is 1,2-cyclohexylene, 1,3-cyclohexylene or 1,4-cyclohexylene group. Alk is a straight or branched alkylene group having from 1 to 3 carbon atoms, possibly interrupted by a sulfur atom, R is a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms,   see diagramm : EP0178980,P49,F2   where Z'' is a 1,3-phenylene or 1,4-phenylene group, Y is an alkylene group (CH2 )m  in which m = 1, 2 or 3, R' is hydrogen or methyl and R is as defined above, - Z''-CO-NH-Y-NH2  where Z'' and Y are as defined above, - Z''-Y'-NH-CO-Y-NH2  where Z'' and Y are as defined above and Y' is a straight or branched alkylene group with 1 or 2 carbon atoms,   see diagramm : EP0178980,P49,F3   where n = 0 or 1 and Y is as defined above, - a 2-piperidyl, 3-piperidyl or 4-piperidyl group possibly substituted on the nitrogen atom by a -CO-Y-NH2  group where Y is as defined above, - a group   see diagramm : EP0178980,P49,F4   - the bicyclic group   see diagramm : EP0178980,P49,F5   as well as the pharmaceutically acceptable salts and esters thereof, characterized in that said process consists : 1) in reacting on the compound of formula :   see diagramm : EP0178980,P50,F6   in which R1  and R2  are as defined above, R'3  is hydrogen, a cyclopropyl group or a readily labile ester group, of which the amine function has been protected beforehand, the acid or thioacid of formula B'-(CH2 )n -COXH, in which X and n are as defined above, B' is the B group such as defined above, in which the amine function is protected, 2) in subjecting the resulting compound to the action of phosphorous tribromide at low temperature and within a solvent, in order to eliminate the S-oxide function, 3) in eliminating the protecting groups present on the amine and carboxylic functions, by hydrolysis in acid medium, 4) in isolating the resulting compound of formula (I) in the form of a salt of amine group B, 5) in optionally converting said salt into another salt of amine group B, 6) in optionally isolating the expected compound of formula 1, from a salt of amine group B, by the action of a base, and in optionally converting said compound, by known methods, into a salt or an ester deriving from one or two carboxylic groups present in the molecule.