Highly Linear Selective Cobalt-Catalyzed Addition of Aryl Imines to Styrenes: Reversing Intrinsic Regioselectivity by Ligand Elaboration
作者:Wengang Xu、Naohiko Yoshikai
DOI:10.1002/anie.201408028
日期:2014.12.15
Highly linear selective, imine‐directed hydroarylation of styrene has been achieved with cobalt‐based catalytic systems featuring bis(2,4‐dimethoxyphenyl)(phenyl)phosphine and either 2‐methoxypyridine or DBU as a ligand and a Lewis base additive, respectively, thus affording a variety of 1,2‐diarylethanes (bibenzyls) in good yields under mild reaction conditions. The triarylphosphine controls the regioselectivity
使用基于双(2,4-二甲氧基苯基)(苯基)膦和2-甲氧基吡啶或DBU分别作为配体和Lewis碱添加剂的钴基催化体系,可以实现苯乙烯的高度线性选择性,亚胺定向的氢芳基化反应,因此,在温和的反应条件下,可以提供高收率的各种1,2-二芳基乙烷(联苄)。三芳基膦控制区域选择性,而路易斯碱则显着加速反应。配体筛选和氘标记研究提供了有关配体和路易斯碱在关键的CC还原消除步骤中的作用的暗示。