Regioselectivity in the Aryne Cross-Coupling of Aryllithiums with Functionalized 1,2-Dibromobenzenes
作者:Vincent Diemer、Manon Begaud、Frédéric R. Leroux、Françoise Colobert
DOI:10.1002/ejoc.201001283
日期:2011.1
Tri- and tetrasubstituted ortho-bromobiaryls have been synthesized in good-to-excellent yields by aryne cross-coupling reactions starting from 1,3-dimethoxybenzene and functionalized 1,2-dibromobenzenes. This study outlines the influence of the 1,2-dibromobenzene precursor as well as the reaction temperature on the outcome of the aryl-aryl bond formation and indicates, in the case of dissymmetrical
通过以 1,3-二甲氧基苯和功能化的 1,2-二溴苯为起始原料的芳炔交叉偶联反应,已经合成了三和四取代的邻溴联芳基化合物,产率非常好。本研究概述了 1,2-二溴苯前体以及反应温度对芳基-芳基键形成结果的影响,并指出了在不对称苄前体的情况下,结构参数(电子效应、空间位阻、温度等)控制芳炔交叉偶联反应的区域选择性。