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.
N-Heterocyclic Carbene Ligand-Controlled Regioselectivity for Nickel-Catalyzed Hydroarylation of Vinylarenes with Benzothiazoles
作者:Rui-Peng Li、Zheng-Wang Shen、Qin-Jia Wu、Jie Zhang、Hong-Mei Sun
DOI:10.1021/acs.orglett.9b01645
日期:2019.7.5
A facile regioselective switch for nickel-catalyzed hydroarylation of vinylarenes with benzothiazoles has been developed, which relies on the simple structural variation of novel Ni(II) complexes of the type Ni(NHC)[P(OR)3]Br2. Using magnesium turnings as the reductant, Ni(IMes)[P(OEt)3]Br2 afforded branched products, while Ni(IPr*OMe)[P(OEt)3]Br2 created steric demand to afford linear products. This