The Regioselective Switch for Amino-NHC Mediated C–H Activation of Benzimidazole via Ni–Al Synergistic Catalysis
作者:Wei-Chun Shih、Wen-Ching Chen、Ying-Chieh Lai、Ming-Shiuan Yu、Jhao-Jhe Ho、Glenn P. A. Yap、Tiow-Gan Ong
DOI:10.1021/ol300570f
日期:2012.4.20
We have disclosed a new mode of a chemically regioselective switch for C-H bond functionalization of benzimidazole derivatives via a cooperative effect invoked by Ni-Al bimetallic catalysis to create a steric requirement for obtaining the linear product of styrene insertion. Yet, excluding the AlMe3 cocatalyst switches the reaction toward branch selectivity.
Cu-Catalyzed Regioselective C–H Alkylation of Benzimidazoles with Aromatic Alkenes
Herein we report a novel Cu-catalyzed regioselective C2–H alkylation of benzimidazoles with aromatic alkenes. The reaction features exclusive regioselectivity and broad substrate scope in the intermolecular alkylation of benzimidazoles with terminal and internal aromatic alkenes, constituting a modular access toward benzimidazole-containing 1,1-di(hetero)aryl alkanes. The intramolecular C2–H alkylation