通过微波辅助聚磷酸乙酯(PPE)促进的ω-硫代酰胺醇的闭环反应,开发了一种高效且通用的合成2-取代的噻唑啉和5,6-二氢-4 H -1,3-噻嗪的方法。环化反应涉及S N 2型机理,具有反应时间短,产率高和可预测的立体化学结果的优点。无环前体是通过改进的二酰化-硫磺化-皂化顺序,从市售的ω-氨基醇中以高收率制备的。整个过程无金属且操作简单。
Rehlaender, Chemische Berichte, 1894, vol. 27, p. 2156
作者:Rehlaender
DOI:——
日期:——
Stereospecific Synthesis of Bicyclic β-Lactams via Metal-Catalyzed Carbonylative Coupling and Cyclization Reactions
作者:Zhongxin Zhou、Howard Alper
DOI:10.1021/jo9517104
日期:1996.1.1
Bicyclic beta-lactams were synthesized by the carbonylative coupling and cyclization reaction of 2-aryl-1,3-thiazines with allyl phosphates, catalyzed by bis(benzonitrile)palladium dichloride, using N,N-diisopropylethylamine as a base in tetrahydrofuran. Several rhodium complexes were also effective for this process. These transformations are stereospecific, with the aryl and vinyl groups on the beta-lactam ring being cis to each other. This methodology provides a novel route for the preparation of the cepham analogs, cis-7-vinyl-5-thia-1-azabicyclo[4.2.0]octan-8-ones.