[EN] AN IMPROVED PROCESS FOR THE PREPARATION OF CHLORO METHYL CEPHEM DERIVATIVES<br/>[FR] PROCEDE AMELIORE DE PREPARATION DE DERIVES DE CHLOROMETHYLCEPHEME
申请人:ORCHID CHEMICALS & PHARM LTD
公开号:WO2004039813A1
公开(公告)日:2004-05-13
The present invention provides an improved process to produce the chloromethylcephem derivatives of the formula (I), wherein R1 represents a carboxy-protecting group viz., substituted methyl group, which can be deprotected easily, such as t-butyl group, diphenylmethyl, 4-methoxybenzyl, 2-methoxybenzyl, 2-chlorobenzyl or benzyl group; R2 represents hydrogen, (C1-C4)alkyl, substituted or unsubstituted phenyl or substituted or unsubstituted phenoxy group.
本发明提供了一种改进的方法,用于生产式(I)的氯甲基头孢菌素衍生物,其中R1代表羧基保护基,即,可以轻松去保护的取代甲基基团,例如叔丁基基团,二苯甲基,4-甲氧基苯甲基,2-甲氧基苯甲基,2-氯苯甲基或苄基;R2代表氢,(C1-C4)烷基,取代或未取代的苯基或取代或未取代的苯氧基。