Diastereomerically and Enantiomerically Pure 2,3-Disubstituted Pyrrolidines from 2,3-Aziridin-1-ols Using a Sulfoxonium Ylide: A One-Carbon Homologative Relay Ring Expansion
作者:Jennifer M. Schomaker、Somnath Bhattacharjee、Jun Yan、Babak Borhan
DOI:10.1021/ja065833p
日期:2007.2.1
An ylide-based aza-Payne rearrangement of 2,3-aziridin-1-ols leads to an efficient process for the preparation of pyrrolidines. The aza-Payne rearrangement under basic reaction conditions favors the formation of epoxy amines. Subsequent nucleophilic attack of the epoxide by the ylide yields a bis-anion, which upon a 5-exo-tet ring-closure yields the desired pyrrolidine, thus completing the relay of
2,3-氮丙啶-1-醇的基于叶立德的氮杂-佩恩重排导致制备吡咯烷的有效方法。碱性反应条件下的氮杂-佩恩重排有利于环氧胺的形成。随后环氧化物被叶立德亲核攻击产生双阴离子,在 5-exo-tet 闭环后产生所需的吡咯烷,从而完成三元到五元含氮环系统的接力. 这个过程发生在立体化学保真度完全转移的情况下,可以应用于空间位阻的氮丙啶醇。