Asymmetric ring-opening of oxabenzonorbornadiene with amines promoted by a chiral iridium-monophosphine catalyst
作者:Renshi Luo、Jianhua Liao、Ling Xie、Wenjun Tang、Albert S. C. Chan
DOI:10.1039/c3cc46009f
日期:——
A new iridium-monophosphine catalyst is found to be efficient for asymmetric ring-opening of benzonorbornadiene with amines, providing a series of chiral substituted dihydronaphthalenes in high yields (up to 98%) and excellent enantioselectivities (>99%).
Iridium-catalyzed asymmetric ring-openingreactions of oxabicyclic alkenes with various aliphatic and aromatic secondaryamines are reported for the first time. The reaction gave the corresponding trans-1,2-dihydronaphthalenol derivatives in good yields with moderate enantioselectivities in the presence of 2.5 mol % [Ir(COD)Cl](2) and 5 mol % bisphosphine ligand (S)-p-Tol-BINAP. The trans-configuration
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.