New 7-diacylimido cephalosporins are produced by reacting 7-acylamido cephalosporins with an acylating agent in the presence of a silyl reagent. The 7-diacylimido cephalosporins are cleaved to produce cephalosporins containing a different acylamido moiety. Thus, the aminoadipoyl group of cephalosporins produced by fermentation is replaced by a different acyl group by the process of the present invention. The cephalosporins produced are antibiotics having enhanced activity against gram-negative and gram-positive pathogens.
新的7-二
酰亚胺头孢菌素是通过将7-酰胺
头孢菌素与酰化剂在
硅烷试剂存在下反应而产生的。7-二
酰亚胺头孢菌素被裂解以产生含有不同酰胺基团的
头孢菌素。因此,发酵产生的
头孢菌素中的
氨基己二酰基基团被本发明的方法中的不同酰基替换。产生的
头孢菌素是具有增强活性对抗革兰氏阴性和革兰氏阳性病原体的抗生素。