Synthesis of (±)-thienamycin based on a new approach to β-lactams via 4-exo-trig cyclisation of carbamoylcobalt salophens
作者:Gerald Pattenden、Stephen J. Reynolds
DOI:10.1039/p19940000379
日期:——
been shown to be useful precursors in a new approach to β-lactams (viz.12-16, 21 and 31), via 4-exo-trig modes of cyclisation of the corresponding intermediate carbamoyl radicals. A new formal synthesis of (±)-thienamycin 1 from the trans-disubstituted azetidin-2-one 31 produced in one step by heating the carbamoylcobalt salophen 30 in toluene, is also described.
一系列Ñ取代的丙烯基Ñ -benzylcarbamoylcobalt(III)salophens,即11,20和30,已准备,并且已经显示出在一种新的方法,以β内酰胺的前体有用的(即12 - 16,21和31),通过相应的中间氨基甲酰基基团的环化的4- exo - trig模式。从反式-二取代的氮杂环丁烷-2-酮31合成(±)-噻吩霉素1的新形式还描述了通过在甲苯中加热氨基甲酰钴盐酚30一步生产的方法。