4-Propargyl-2-azetidinone as a versatile synthon for the synthesis of .BETA.-lactam antibiotics : Hydrostannation and its reactivities.
作者:ATSUSHI NISHIDA、MASAKATSU SHIBASAKI、SHIRO IKEGAMI
DOI:10.1248/cpb.34.1423
日期:——
An efficient preparation of 4-propargyl-2-azetidinone (6) from 4-phenylsulfonyl-2-azetidinone is described. This compound was converted to the ketones 14 and 16, which are the key intermediates for the synthesis of carbapenem and carbacephem antibiotics. In this transformation it was found that polar functional groups (β-lactam, OH, etc.) control the regiochemistry of hydrostannation of the internal alkyne. The reaction of epoxystannanes with formic acid to give the ketones is also described.
本文介绍了一种从 4-苯磺酰基-2-氮杂环丁酮高效制备 4-丙炔基-2-氮杂环丁酮(6)的方法。该化合物被转化为酮 14 和酮 16,它们是合成碳青霉烯类和碳青霉烯类抗生素的关键中间体。在这一转化过程中发现,极性官能团(β-内酰胺、羟基等)控制着内部炔烃的氢化锡化的区域化学。此外,还介绍了环氧锡烷与甲酸反应生成酮的过程。