Enantioselective Synthesis of Homoallylic Amines through Reactions of (Pinacolato)allylborons with Aryl-, Heteroaryl-, Alkyl-, or Alkene-Substituted Aldimines Catalyzed by Chiral <i>C</i><sub>1</sub>-Symmetric NHC−Cu Complexes
作者:Erika M. Vieira、Marc L. Snapper、Amir H. Hoveyda
DOI:10.1021/ja200311n
日期:2011.3.16
A catalytic method for enantioselective synthesis of homoallylamides through Cu-catalyzed reactions of stable and easily accessible (pinacolato)allylborons with aryl-, heteroaryl-, alkyl-, or alkenyl-substituted N-phosphinoylimines is disclosed. Transformations are promoted by 1-5 mol % of readily accessible NHC-Cu complexes, derived from C(1)-symmetric imidazolinium salts, which can be prepared in
公开了通过稳定且容易获得的(频哪醇)烯丙基硼与芳基-、杂芳基-、烷基-或烯基-取代的N-膦亚胺的Cu催化反应,对映选择性合成高烯丙基酰胺的催化方法。转化由 1-5 mol% 的易于获得的 NHC-Cu 配合物促进,该配合物源自 C(1)-对称咪唑啉盐,可以从市售材料中分四步以多克的量制备。烯丙基加成以高达定量产率和 98.5:1.5 的对映体比提供所需的产品,并且适合克级操作。提出了解释观察到的选择性水平和趋势的机械模型。