Asymmetric Kumada–Corriu cross-coupling reaction with Pd2(dba)3 and an N–Ar axially chiral mimetic-type ligand catalyst
作者:Hideo Horibe、Yoshimasa Fukuda、Kazuhiro Kondo、Hiroaki Okuno、Yasuoki Murakami、Toyohiko Aoyama
DOI:10.1016/j.tet.2004.09.010
日期:2004.11
aryl bromide groups, the chemoselective asymmetric cross-coupling reaction of the vinyl bromide group is observed. This N–Ar axially chiral mimetic-type ligand allows easy synthesis of a wide variety of analogues, and starting from the initial ligand, the enantioselectivity of coupling products is improved by modifying the structure in the ligand.
一种由Pd 2(dba)3 ·CHCl 3和N–Ar轴向手性模拟型配体(S)-N- [2-(二苯基膦基)萘-1-基] -2-(哌啶基甲基)哌啶组成的催化剂,为1-苯基乙基氯化镁与E的不对称Kumada-Corriu交叉偶联反应提供了良好的对映选择性-β-溴苯乙烯衍生物,用它很难实现高对映选择性。此外,在同时带有乙烯基和芳基溴化物基团的苯乙烯衍生物的情况下,观察到乙烯基溴化物基团的化学选择性不对称的交叉偶联反应。这种N–Ar轴向手性模拟型配体可轻松合成多种类似物,并且从初始配体开始,通过修饰配体中的结构可改善偶联产物的对映选择性。