Iridium-Catalyzed Asymmetric Ring-Opening Reactions of Oxabenzonorbornadienes with Amine Nucleophiles
作者:Dingqiao Yang、Yuhua Long、Junfang Zhang、Heping Zeng、Sanyong Wang、Chunrong Li
DOI:10.1021/om100384q
日期:2010.8.23
We have explored a new iridium-catalyzed ring-openingreaction of oxabenzonorbornadienes with a variety of primary aromatic amine or N-substituted piperazine nucleophiles, affording the corresponding products in excellent yields (up to 99%) with moderate enantioselectivity (25−81% ee). The trans configuration of product 2d was confirmed by X-ray crystallography.
As an efficient catalyst, the [Ir(COD)CI](2)/NMDPP complex has been successfully applied to promote the asymmetric ring opening reaction of oxabenzonorbornadienes with various amines, which afforded the corresponding products in good yields (72-98%) with good enantioselectivities (80-90% ee). (C) 2014 Published by Elsevier Ltd.