title: CO2as a C1 Source: B(C6F5)3-Catalyzed Cyclization of o-Phenylene-diamines To Construct Benzimidazoles in the Presence of Hydrosilane.
abstract: The catalytic construction of benzimidazoles using CO2as a carbon source represents a facile and sustainable approach to obtaining these valuable compounds. Herein, we describe the B(C6F5)3-catalyzed synthesis of benzimidazoles via cyclization of o-phenylenediamines with CO2and PhSiH3. This metal-free catalytic route achieves the desired products in high yield under convenient reaction conditions and is applicable to a broad substrate scope. A plausible mechanism for the reaction involving a frustrated Lewis pair pathway is proposed based on spectroscopic characterization (e.g.,13C NMR) of the reaction intermediates.
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, and Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000, P. R. China.|University of Chinese Academy of Sciences , Beijing 100049, P. R. China.
authors.forename: Zhenbei
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, and Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Qiangsheng
authors.initials: Q
authors.lastname: Sun
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, and Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Chungu
authors.initials: C
authors.lastname: Xia
authors.affiliation: State Key Laboratory for Oxo Synthesis and Selective Oxidation, and Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences , Lanzhou 730000, P. R. China.
authors.forename: Wei
authors.identifier: 0000-0003-4448-2390
authors.initials: W
authors.lastname: Sun