Facile One-Pot Palladium-Catalyzed Sequential Coupling to Diarylmethanes by Using Aryl Methyl Ketones as the Methylene Donors
作者:Xing Wang、Lian-Hua Liu、Jin-Hua Shi、Ji Peng、Hai-Yang Tu、Ai-Dong Zhang
DOI:10.1002/ejoc.201300594
日期:2013.10
A novel palladium-catalyzed coupling reaction of an aryl methyl ketone with two molecules of an aryl halide to yield symmetric diarylmethanes is described. In the facile one-pot reaction, the aryl methyl ketone acts as a formal methylene donor. The experimental facts, including TLC monitoring, speculated intermediates as the raw materials, analysis of the cesium benzoate coproduct by ex situ IR spectroscopy
描述了一种新的钯催化的芳基甲基酮与两个分子的芳基卤化物的偶联反应,以产生对称的二芳基甲烷。在简便的一锅法反应中,芳基甲基酮充当形式亚甲基供体。实验事实,包括 TLC 监测、推测的中间体作为原料、通过非原位红外光谱分析苯甲酸铯副产物,以及两种不同芳基卤化物的交叉偶联反应,表明了一种涉及钯催化的连续双反应的机制。步耦合过程,其中微量 H2O 的存在是必不可少的。该反应适用于广泛的底物,并以良好的收率提供产品。还探讨了使用这种方法获得不对称二芳基甲烷的途径,并讨论了各种因素。