Metal-Reductant-Free Electrochemical Nickel-Catalyzed Couplings of Aryl and Alkyl Bromides in Acetonitrile
作者:Robert J. Perkins、Alexander J. Hughes、Daniel J. Weix、Eric C. Hansen
DOI:10.1021/acs.oprd.9b00232
日期:2019.8.16
attractive approach for the synthesis of complex molecules at both small and large scale, two barriers for large-scale applications have remained: the use of stoichiometric metal reductants and a need for amide solvents. In this communication, new conditions that address these challenges are reported. The nickel-catalyzed reductive cross-coupling of aryl bromides with alkyl bromides can be conducted in a
尽管还原性交叉电化学偶联是小规模和大规模合成复杂分子的一种有吸引力的方法,但仍存在大规模应用的两个障碍:化学计量的金属还原剂的使用和对酰胺溶剂的需求。在本通信中,报告了应对这些挑战的新条件。镍催化的芳基溴化物与烷基溴化物的交叉还原偶联反应可以在分开的电化学槽中进行,使用乙腈作为溶剂,二异丙基胺作为牺牲性还原剂,以提供合成有用的收率(22-80%)。另外,使用配体4,4',4''-三叔丁基-2,2':6',2'-叔吡啶和4,4'-二叔丁基的组合-丁基-2,2'-联吡啶对于实现高收率至关重要。