tert-Butyl 7beta-aminoceph-3-em-4-carboxylates carrying either benzyl or 3-pyridylmethyl substituents at position 3 have been prepared by a multistep modification of the penicillin nucleus. Acylation of either amine, followed by deprotection, gave a range of new cephalosporins. The relationship between structure and antibacterial activity is discussed. D-Phenylglycine proved to be a preferred side
通过对
青霉素核的多步修饰,已经制备了在3位带有苄基或3-
吡啶基甲基取代基的7β-
氨基乙酰基-3-em-4-
羧酸叔丁酯。酰化任一胺,然后脱保护,得到一系列新的
头孢菌素。讨论了结构与抗菌活性之间的关系。在两个系列中,D-苯基甘
氨酸被证明是优选的侧链。