Chan–Evans–Lam Amination of Boronic Acid Pinacol (BPin) Esters: Overcoming the Aryl Amine Problem
作者:Julien C. Vantourout、Robert P. Law、Albert Isidro-Llobet、Stephen J. Atkinson、Allan J. B. Watson
DOI:10.1021/acs.joc.6b00466
日期:2016.5.6
The Chan–Evans–Lam reaction is a valuable C–N bond forming process. However, aryl boronic acid pinacol (BPin) ester reagents can be difficult coupling partners that often deliver low yields, in particular in reactions with aryl amines. Herein, we report effective reaction conditions for the Chan–Evans–Lam amination of aryl BPin with alkyl and aryl amines. A mixed MeCN/EtOH solvent system was found
Chan–Evans–Lam反应是有价值的C–N键形成过程。但是,芳基硼酸频哪醇(BPin)酯试剂可能很难成为偶合剂,常常导致收率低,特别是在与芳基胺反应时。在此,我们报告了烷基-芳基胺与芳基BPin的Chan-Evans-Lam胺化反应的有效反应条件。发现混合的MeCN / EtOH溶剂系统可以使用芳基胺形成有效的C–N键,而烷基胺的偶联则不需要EtOH。