Process for the preparation of novel syn isomers of 7- substituted 3-vinyl-3-cephem compounds

摘要

Novel syn isomers of compounds of the general formula I in which R<1> is amino or protected amino, and the salts thereof are prepared by removing from a compound of the general formula Ia in which R<1> has the above meaning, and R<2> is a protected carboxyl group, or a salt thereof, the carboxyl protective group by hydrolysis or reduction, and converting the resulting compound where appropriate into a salt. The compounds have antimicrobial activity.