Use of bistrimethylsilylated intermediates in the preparation of semisynthetic 7-amino-3-substituted cephems. Expedient syntheses of a new 3-[(1-methyl-1-pyrrolidinio)methyl]cephalosporin
General Synthesis of Industrial Cephalosporin-Based Antibiotics Through Amidation with Tosyl Chloride as a Coupling Reagent
作者:Matthias Pieper、Herbert Schleich、Harald Gröger
DOI:10.1002/ejoc.201900277
日期:2019.6.2
The feasibility of an amidation method for a general synthesis of industrially important semi‐synthetic cephalosporin antibiotics starting from readily available 7‐aminocephalosporanic acid and derivatives thereof is demonstrated. The amidation process is based on the use of 4‐toluenesulfonyl chloride as an economically attractive coupling reagent in combination with methanol or ethyl acetate as preferred