Ligand-free nickel-catalyzed Kumada couplings of aryl bromides with tert-butyl Grignard reagents
作者:Zhenghan Wu、Tengda Si、Guangqing Xu、Bin Xu、Wenjun Tang
DOI:10.1016/j.cclet.2018.12.027
日期:2019.3
Abstract A ligand-free nickel-catalyzed Kumada cross-coupling of aryl bromides and tert-butyl Grignard reagents led to the formation of a series of tert-butyl aryls in moderate to good yields, excellent tBu/iBu ratios, and good functional group compatibility. A radical coupling process is indicated and a mechanism with a Ni(I)-Ni(III) catalytic cycle is proposed.
摘要无配体镍催化的芳基溴化物和叔丁基格氏试剂的Kumada交叉偶联导致中等至良好的收率,优异的tBu / iBu比和良好的官能团相容性形成一系列叔丁基芳基。指出了自由基偶联过程,并提出了具有Ni(I)-Ni(III)催化循环的机理。