Proton Abstraction Mechanism for the Palladium-Catalyzed Intramolecular Arylation
作者:Domingo García-Cuadrado、Ataualpa A. C. Braga、Feliu Maseras、Antonio M. Echavarren
DOI:10.1021/ja056165v
日期:2006.2.1
Under the usual conditions, the Pd-catalyzed arylation does not involve an electrophilic aromatic substitution reaction. On the basis of DFT calculations, we propose a mechanism for the Pd-catalyzed arylation that involves a proton abstraction by a carbonate or related ligand and that provides a satisfactory explanation for the experimental data.
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 intramolecularpalladium-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