Selective conversion of benzyl alcohol carboxylates to the free acid form
申请人:Shionogi & Co., Ltd.
公开号:US04223132A1
公开(公告)日:1980-09-16
A process for preparing free carboxylic acids which comprises treating an optionally substituted benzyl ester with a Lewis acid, preferably in the presence of a cation acceptor, followed by hydrolysis, if required.
Process for the preparation of esters of N-blocked penicillin acids
申请人:Glaxo Laboratories Limited
公开号:US03960843A1
公开(公告)日:1976-06-01
A process is described for the preparation of esters of N-blocked amino acids (such as penicillins or cephalosporins) wherein the amino acid or a salt thereof is reacted with a primary amine and nitrosating agent.