Method for producing 7-aminocephem compounds

Details Method for producing 7-aminocephem compounds Method for producing 7-aminocephem compounds

C - Chemistry, Metallurgy

07

D

260/102, 260/108

C07D 501/18 (2006.01) A61K 31/545 (2006.01) C07D 501/02 (2006.01) C07D 501/04 (2006.01) C07D 501/36 (2006.01) C07D 501/46 (2006.01)

Patent

CA 1169419

Abstract of the disclosure An improvement, in per se known method for producing 7-aminocephem compound being important intermediate for producing antimicrobial substances, represented by the formula: Image [II] wherein R1 is a hydrogen atom or a methoxy group and R2 is a residue of a thiol compound, or a salt or ester thereof, by reacting a compound of the formula: Image [I] wherein R1 is as defined above and R is a carboxylic acid acyl group, or a salt or ester thereof,with a thiol compound or a salt thereof, is characterized in that the reaction is conducted in an organic solvent in the presence of a dihalo- phosphoric acid to give the compound [II] in high yield and high purity.

389499

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