Substituent effects at the origin of a free-radical 1,2-aryl migration and in the related disproportionation reaction of 10-hydro-9-p-X-phenyl-9-phenanthryl radicals
Bidentate phosphines as ligands in the palladium-catalyzed intramolecular arylation: the intermolecular base-assisted proton abstraction mechanism
作者:Sergio Pascual、Paula de Mendoza、Ataualpa A.C. Braga、Feliu Maseras、Antonio M. Echavarren
DOI:10.1016/j.tet.2008.01.056
日期:2008.6
The palladium-catalyzed arylation of aryl bromides can be carried out in the presence of bidentatephosphines, such as dppm, dppe, dppf, and Xantphos under mild conditions. The experimental results and the DFT calculations fully support for this reaction a mechanism proceeding by an intermolecular proton abstraction.