Ni-Catalyzed cross coupling of aryl grignard reagents with aryl halides in a nonpolar solvent and an efficient synthesis of biaryls under neat conditions
Qiang Wu , Rizhe Jin , Chuanqing Kang , Wenhui Chen , Zheng Bian , Xiaoye Ma , Jinying Ding , Haiquan Guo , Xuepeng Qiu , Lianxun Gao
Chemical Research in Chinese Universities ›› 2016, Vol. 32 ›› Issue (1) : 55 -61.
Ni-Catalyzed cross coupling of aryl grignard reagents with aryl halides in a nonpolar solvent and an efficient synthesis of biaryls under neat conditions
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.
Cross-coupling / Nickel / Biaryl / Reaction mechanism / Neat condition
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