Alkanenitriles having a heteroatom such as nitrogen, oxygen, and sulfur at the gamma-position are found to add across alkynes stereo- and regioselectively by nickel/Lewis acid catalysis to give highly substituted acrylonitriles. The heteroatom functionalities likely coordinate to the nickel center to make oxidative addition of the C-CN bonds of the alkyl cyanides kinetically favorable, forming a five-membered nickelacycle intermediate and, thus, preventing beta-hydride elimination to allow the alkylcyanation reaction.
Alkanenitriles having a heteroatom such as nitrogen, oxygen, and sulfur at the gamma-position are found to add across alkynes stereo- and regioselectively by nickel/Lewis acid catalysis to give highly substituted acrylonitriles. The heteroatom functionalities likely coordinate to the nickel center to make oxidative addition of the C-CN bonds of the alkyl cyanides kinetically favorable, forming a five-membered nickelacycle intermediate and, thus, preventing beta-hydride elimination to allow the alkylcyanation reaction.
reaction conditions for radical decarboxylation to produce alkyl radicals, which could be effectively intercepted by asymmetric electrochemical Cu catalysis for the construction of C−CN bonds in a highly stereoselective manner.
开发了一种可持续且高效的电光化学金属催化方案,用于将现成的脂肪族羧酸直接转化为手性烷基腈。电光化学 Ce 催化能够在温和的反应条件下自由基脱羧产生烷基自由基,其可以被不对称电化学 Cu 催化有效拦截,以高度立体选择性的方式构建 C-CN 键。
Copper-Catalyzed Enantioselective Decarboxylative Cyanation of Benzylic Acids Promoted by Hypervalent Iodine(III) Reagents
directly decarboxylative cyanation reactions of common alkyl carboxylic acids remain largely elusive. Herein, we report a protocol for copper-catalyzed direct and enantioselective decarboxylative cyanation of benzylic acids. The in situ activation of acid substrates by a commercially inexpensive hypervalentiodine(III) reagent promoted the yield of the alkyl radicals undermild reaction conditions without
Alkanenitriles having a heteroatom such as nitrogen, oxygen, and sulfur at the gamma-position are found to add across alkynes stereo- and regioselectively by nickel/Lewis acid catalysis to give highly substituted acrylonitriles. The heteroatom functionalities likely coordinate to the nickel center to make oxidative addition of the C-CN bonds of the alkyl cyanides kinetically favorable, forming a five-membered nickelacycle intermediate and, thus, preventing beta-hydride elimination to allow the alkylcyanation reaction.