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青霉素扩环为头孢菌素的方法中,关于扩环成为脱乙酰氧基头孢菌素的方法已有综述,本文仅就扩环成为其他头孢菌素的方法作一综合报道。 3-酰氧甲基头孢-3-烯-4-羧酸酯类青霉素S-氧化物可扩环生成3-酰氧甲基头孢-3-烯-4-羧酸酯类Ⅰ。可先在青霉素S- 例如:
In the method of expanding penicillin to cephalosporin, the method of expanding to deacetoxycephalosporin has been reviewed, and the method of expanding into other cephalosporins is only reported in this article. 3-acyloxymethyl ceph-3-em-4-carboxylate penicillin S-oxide can be expanded to form 3-acyloxymethyl ceph-3-em-4-carboxylate I. May first penicillin S-for example: