Improved process for the preparation of 7-(2-amino--2-phenyl-acetamido)cephem derivatives of the general formula (I):
wherein R, is a hydrogen 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 -(CH2)nCOOH 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.
制备通式(I)的 7-(2-
氨基-2-苯基乙酰
氨基)头孢衍
生物的改进工艺:
其中 R 是氢原子或羟基,n 代表 0、1 或 2,A 表示含氮杂环基团或直接将
硫原子和-(
CH2)nCOOH 基团耦合在一起的直接键,以及它们的药学上可接受的盐。该工艺不仅简单易行,而且能以高产率提供预期产品的结晶沉淀。7-(2-
氨基-2-苯基乙酰
氨基)头孢衍
生物可作为合成抗菌剂的中间体。