Improved process for the preparation of 7-(2-amino-2-phenyl-acetamido)cephem derivatives of the general formula (I): ##STR1## wherein R.sub.1 is a hydrogwn atom or hydroxyl group, n stands for 0, 1 or 2, and A denotes a nitrogen-containing heterocyclic group or a direct bond coupling directly the sulfur atom and the --(CH.sub.2).sub.n COOH group together, as well as pharmaceutically acceptable salts thereof. The process is not only simple and easy to carry out, but also provides as crystalline precipitate the intended products with a high yield. The 7-(2-amino-2-phenyl-acetamido)cephem derivatives are useful as intermediates for syntheses of antibacterial agents.
改进的制备7-(2-
氨基-2-苯乙酰胺基)
头孢菌素衍
生物的方法,其通式为(I):##STR1## 其中R.sub.1是氢原子或羟基,n为0、1或2,A表示含氮杂环基团或直接键直接将
硫原子和--(CH.sub.2).sub.n COOH基团耦合在一起,以及其药学上可接受的盐。该方法不仅简单易行,而且以高收率提供预期的产物结晶沉淀。7-(2-
氨基-2-苯乙酰胺基)
头孢菌素衍
生物可用作合成抗菌剂的中间体。