Proton-Abstraction Mechanism in the Palladium-Catalyzed Intramolecular Arylation: Substituent Effects
作者:Domingo García-Cuadrado、Paula de Mendoza、Ataualpa A. C. Braga、Feliu Maseras、Antonio M. Echavarren
DOI:10.1021/ja071034a
日期:2007.5.1
The regioselectivity observed in the intramolecular palladium-catalyzed arylation of substituted bromobenzyldiarylmethanes as well as theoretical results demonstrate that the Pd-catalyzed arylation proceeds by a mechanism involving a proton abstraction by the carbonate, or a related basic ligand. The reaction is facilitated by electron-withdrawing substituents on the aromatic ring, which is inconsistent
在分子内钯催化的取代溴苄基二芳基甲烷的芳基化反应中观察到的区域选择性以及理论结果表明,Pd 催化的芳基化反应通过涉及碳酸酯或相关碱性配体提取质子的机制进行。芳香环上的吸电子取代基促进了反应,这与亲电芳香取代机制不一致。更重要的定向效应是由反应位点邻位的吸电子取代基发挥的。