PROCESS FOR PREPARING CEPHALSSPORIN DERIVATIVES

摘要

Cephalosporings (I) [R=H, halogen; R1=H, alkyl; R2=C1-6 alkyl; A=(un) substd. pyridinium, condensed pyridinium (150 cpds.) are prepd. Thus, 3.7g (I) (R=H, R1=Me, R2=4-ethylpyridinium) is prepd. by treating 6.83g (I) (R2=OAc) with 16.07g 4-ethylpyridine.