Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1): 55-61.doi: 10.1007/s40242-016-5261-0

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Ni-Catalyzed Cross Coupling of Aryl Grignard Reagents with Aryl Halides in a Nonpolar Solvent and an Efficient Synthesis of Biaryls Under Neat Conditions

WU Qiang1,2, JIN Rizhe1, KANG Chuanqing1, CHEN Wenhui1, BIAN Zheng1, MA Xiaoye1, DING Jinying1, GUO Haiquan1, QIU Xuepeng1, GAO Lianxun1   

  1. 1. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China;
    2. University of Chinese Academy of Sciences, Beijing 100864, P. R. China
  • Received:2015-07-06 Revised:2015-08-24 Online:2016-02-01 Published:2015-10-26
  • Contact: KANG Chuanqing, GAO Lianxun E-mail:kangcq@ciac.ac.cn;lxgao@ciac.ac.cn
  • Supported by:

    Supported by the National Basic Research Program of China(No.2014CB643603) and the Jilin Technology R&D Program, China(No.20140203003GX).

Abstract:

This study details Ni-catalyzed cross coupling of aryl Grignard reagents with aryl halides in toluene, a nonpolar solvent with a high boiling point. The reaction was applied for the synthesis of various biaryls in good yields without the introduction of a large steric ligand. The Kumada-Tamao-Corriu(KTC) reaction in toluene was then successfully modified to proceed under neat conditions for the efficient syntheses of symmetrical biaryls, particularly in large-scale preparations. Unactivated aryl chlorides show higher reactivity than aryl bromides, particularly under neat conditions. Mechanistic investigations suggest a radical procedure for the catalytic cycle, and the origin of the radical intermediates being aryl halides.

Key words: Cross-coupling, Nickel, Biaryl, Reaction mechanism, Neat condition