PROCESS FOR PRODUCING 7-BRACKET-ALPHA,ALPHA-DISUBSTITUTED-ACETAMIDO-BRACKET CLOSED-3-SUBSTITUTED-3-CEPHEME-4-CARBOXYLIC ACIDS

摘要

PURPOSE:7-Substituted alkaneamido-3-substituted thiomethyl-3-cephem-4-carboxylic acids of formula I are new: (where R1 is naphtyl, aralkyl, alkoxy, alkylthio, haloalkyl, halogen, nitro, hydroxy, aralkoxy or acylamino, etc.; R3 is heterocyclic group or heterocyclic group substituted by alkyl or alkenyl).