There is disclosed a process for producing carbapenam diazo intermediates of the formula ##STR1## wherein R.sup.1 is hydrogen or a hydroxy-protecting group, R.sup.2 is a lower alkyl having from 1-6 carbon atoms, and R.sup.3 represents a conventional carboxyl-protecting group. The processs comprises alkylating a 4-substituted azetidinone with the tin enolate of an .alpha.-bromoketone, in the presence of a silver salt, iodine, or iodine salt as a catalyst, and a strongly polar solvent. The .beta./.alpha. yield of the product diazo intermediate is approximately 3/1.
公开了一种生产公式为##STR1##的碳青霉烯重氮中间体的方法,其中R.sup.1是氢或羟基保护基,R.sup.2是具有1-6个碳原子的低碳基,而R.sup.3代表传统的羧基保护基。该方法包括在强极性溶剂的存在下,使用
银盐、
碘或
碘盐作为催化剂,以及α-
溴酮的
锡烯醇酯烷基化4-取代的氮杂环
丙酮。产物重氮中间体的β/α收率约为3/1。