Generation of metalated thiophenes with Grignard reagent and catalytic secondary amine for the cross coupling reaction with aryl halides
作者:Shota Tanaka、Daiki Tanaka、Atsushi Sugie、Atsunori Mori
DOI:10.1016/j.tetlet.2011.12.108
日期:2012.2
The reaction of thiophene derivatives with Grignard reagent (EtMgCl) and a catalytic amount of amine (Cy2NH) induced the metalation at the α-position. Following addition of several aryl halides in the presence of a nickel or palladium catalyst afforded C–H arylated products in good to excellent yields. The method was successfully applied to facile synthesis of differently-substituted 2,5-diarylthiophenes
噻吩衍生物与格氏试剂(EtMgCl)和催化量的胺(Cy 2 NH)的反应诱导了α位的金属化。在镍或钯催化剂存在下添加几种芳基卤化物后,可以很好地获得优异收率的CHH芳基化产物。该方法已成功应用于不同取代的2,5-二芳基噻吩的简便合成。