CEPHALOSPORIN CRYSTALS AND PROCESS FOR PRODUCING THE SAME
申请人:OTSUKA CHEMICAL COMPANY, LIMITED
公开号:EP0963989A1
公开(公告)日:1999-12-15
The object of the invention is to provide cephalosporin crystals which are highly stable for a long period under economical storage conditions. The cephalosporin crystals of the invention are obtainable by crystallizing an oily cephalosporin in a solvent containing an alcohol.
Cephalosporin crystals and process for their preparation
申请人:——
公开号:US20020099206A1
公开(公告)日:2002-07-25
The object of the invention is to provide cephalosporin crystals which are highly stable for a long period under economical storage conditions. The cephalosporin crystals of the invention are obtainable by crystallizing an oily cephalosporin in a solvent containing an alcohol.
The present invention is directed to a process for the displacement of the acetoxy group of a cephalosporanic acid by a sulfur nucleophile, in an organic solvent and under essentially anhydrous conditions.