Sodium-iodide-promoted nickel-catalyzed C–N cross-coupling of aryl chlorides and <i>N</i>-nucleophiles under visible-light irradiation
作者:Yunhui Feng、Hang Luo、Fangnian Yu、Qian Liao、Luqing Lin
DOI:10.1039/d2gc04630j
日期:——
Herein, we report visible-light-promoted single nickel catalysis to smoothly achieve various C–N couplings of arylchlorides/bromides and diverse N-nucleophiles with sodium iodide as the activator. Single nickel catalysts play two compatible roles: halogen exchange and C–N coupling, which are critical to successfully obtaining desired coupling products. The catalytic process does not need an exogenous
在此,我们报告了可见光促进的单镍催化以碘化钠作为活化剂顺利实现芳基氯/溴和多种N-亲核试剂的各种 C-N 偶联。单一镍催化剂扮演着两个兼容的角色:卤素交换和 C-N 偶联,这对于成功获得所需的偶联产物至关重要。催化过程不需要外源光催化剂,并提供了一种可持续且有效的方法来在温和条件下实现 C-N 偶联。结合紫外-可见和核磁共振分析的实验研究表明,Ni II和 Ni III -卤化物络合物与碘化物阴离子的卤素交换是产生偶联产物的重要过程。
Catalytic, Atom-Economical Radical Arylation of Epoxides
作者:Andreas Gansäuer、Maike Behlendorf、Daniel von Laufenberg、André Fleckhaus、Christian Kube、Dhandapani V. Sadasivam、Robert A. Flowers
DOI:10.1002/anie.201200431
日期:2012.5.7
A slow electron waltz: Catalysis in single‐electron steps with radicals as intermediates is essential for an atom‐economical arylation of epoxides with a proton‐coupled electron transfer as a key step. Stabilization of the catalyst is essential for low catalyst loading, as demonstrated by reaction‐progress kinetic analysis, cyclic voltammetry, and calculations.