PROCESS FOR THE PREPARATION OF IMIDAZOLEDICARBOXYLIC ACID DERIVATIVES OF CEPHALOSPORINS

摘要

A process is disclosed for producing an imidazole carboxylic acid derivative of the following general formula wherein each of X and R, which may be the same or different, is a hydrogen atom or a substituent; which process comprises reacting, in formamide, 4-pyridineethanesulphonic acid and a compound of the following general formula:- wherein X and R are as defined above. a