(2-Bromoethyl)sulfonium Trifluoromethanesulfonates in Stereoselective Annulation Reactions for the Formation of Fused Bicyclic Epoxides and Aziridines
作者:Sven P. Fritz、Zulfiquar Ali、Matthew G. Unthank、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1002/hlca.201200455
日期:2012.12
A versatile and simple method is reported for the synthesis of bicyclic epoxide and aziridinefused heterocycles (up to 98% yield, up to 96 : 4 er or up to 15 : 1 dr), using a tandem Michael addition/JohnsonCoreyChaykovsky annulation approach. A new chiral (2‐bromoethyl)sulfonium reagent is described, based on an easily available chiral sulfide; it promotes or enhances stereoselectivity in the reaction
一种多功能的,简单的方法被报告双环环氧化物和氮丙啶的合成稠合杂环(高达98%的产率,高达96:4 ER或高达15:1个,DR),使用串联迈克尔加成/约翰逊科里 Chaykovsky环行方法。基于易于获得的手性硫化物,描述了一种新的手性(2-溴乙基)ulf试剂。它促进或增强反应中的立体选择性。