Nickel-Catalyzed Hydroheteroarylation of Vinylarenes
作者:Yoshiaki Nakao、Natsuko Kashihara、Kyalo Stephen Kanyiva、Tamejiro Hiyama
DOI:10.1002/anie.201001470
日期:2010.6.14
In the nickel of time: A nickel/carbene catalyst effects the hydroheteroarylation of vinylarenes to give 1,1‐diarylethanes that contain various heteroaryl moieties with excellent regioselectivity. EWG= electron‐withdrawing group.
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
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
Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkyl-substituted benzimidazoles with arenes in the superacid CF<sub>3</sub>SO<sub>3</sub>H. NMR and DFT studies of dicationic electrophilic species
作者:Dmitry S Ryabukhin、Alexey N Turdakov、Natalia S Soldatova、Mikhail O Kompanets、Alexander Yu Ivanov、Irina A Boyarskaya、Aleksander V Vasilyev
DOI:10.3762/bjoc.15.191
日期:——
Reactions of 2-carbonyl- and 2-hydroxy(or methoxy)alkylbenzimidazoles with arenes in the Brønsted superacid TfOH resulted in the formation of the corresponding Friedel–Crafts reaction products, 2-diarylmethyl and 2-arylmethyl-substituted benzimidazoles, in yields up to 90%. The reaction intermediates, protonated species derived from starting benzimidazoles in TfOH, were thoroughly studied by means
Mechanistic Study of a Switch in the Regioselectivity of Hydroheteroarylation of Styrene Catalyzed by Bimetallic Ni-Al through CH Activation
作者:Wen-Ching Chen、Ying-Chieh Lai、Wei-Chun Shih、Ming-Shiuan Yu、Glenn P. A. Yap、Tiow-Gan Ong
DOI:10.1002/chem.201400303
日期:2014.6.23
previously reported a highly efficient protocol for bimetallicNi–Al‐catalyzedhydroheteroarylation of styrene with benzimidazole based on CH bond activation. We have now delineated the mechanism of this process, providing a rationale for an observed switch in regioselectivity in the presence of the Lewis acid, AlMe3. The present mechanisticstudy gives insights for the rational development of catalysts