Rhodium-Catalyzed Asymmetric Intramolecular Hydroamination of Unactivated Alkenes
作者:Xiaoqiang Shen、Stephen L. Buchwald
DOI:10.1002/anie.200905402
日期:2010.1.12
One for the Rh(oad): The first rhodium‐catalyzed asymmetric intramolecular hydroamination of unactivated olefins was developed by using dialkylbiaryl phosphine ligands (see scheme; cod=1,5‐cyclooctadiene, Cy=cyclohexyl). A variety of 2‐methylpyrrolidines have been synthesized with high enantioselectivities.
Design, scope and mechanism of highly active and selective chiral NHC–iridium catalysts for the intramolecular hydroamination of a variety of unactivated aminoalkenes
Chiral, cationic NHC–iridium complexes are introduced as catalysts for the intramolecular hydroamination reaction of unactivated aminoalkenes. The catalysts show high activity in the construction of a range of 5- and 6-membered N-heterocycles, which are accessed in excellent optical purity, with various functional groups being tolerated with this system. A major deactivation pathway is presented and
引入手性阳离子 NHC-铱配合物作为未活化氨基烯烃分子内氢胺化反应的催化剂。该催化剂在构建一系列 5 元和 6 元 N 杂环时表现出高活性,这些杂环具有优异的光学纯度,并且该系统可以耐受各种官能团。通过使用替代反应条件呈现和消除主要的失活途径。对反应机理进行了详细的实验和计算研究,为催化系统的作用模式提供了有价值的见解,并指出了对该催化平台的未来修改。