Dual electrocatalysis enables enantioselective hydrocyanation of conjugated alkenes
作者:Lu Song、Niankai Fu、Brian G. Ernst、Wai Hang Lee、Michael O. Frederick、Robert A. DiStasio、Song Lin
DOI:10.1038/s41557-020-0469-5
日期:2020.8
Chiralnitriles and their derivatives are prevalent in pharmaceuticals and bioactive compounds. Enantioselective alkene hydrocyanation represents a convenient and efficient approach for synthesizing these molecules. However, a generally applicable method featuring a broad substrate scope and high functional group tolerance remains elusive. Here, we address this long-standing synthetic problem using
Enantioselective Synthesis of 4-Cyanotetrahydroquinolines via Ni-Catalyzed Hydrocyanation of 1,2-Dihydroquinolines
作者:Mingdong Jiao、Jihui Gao、Xianjie Fang
DOI:10.1021/acs.orglett.0c03171
日期:2020.11.6
A Ni-catalyzed asymmetric hydrocyanation that enables the formation of 4-cyanotetrahydroquinolines in good yields with excellent enantioselectivities is presented herein. A variety of functional groups are well-tolerated, and a gram-scale reaction supports the synthetic potential of the transformation. Additionally, several crucial intermediates for pharmaceutically active agents, including a PGD2
Enantioselective cyanation of benzylic C–H bonds via copper-catalyzed radical relay
作者:Wen Zhang、Fei Wang、Scott D. McCann、Dinghai Wang、Pinhong Chen、Shannon S. Stahl、Guosheng Liu
DOI:10.1126/science.aaf7783
日期:2016.9.2
sp3-hybridized carbon–hydrogen [C(sp3)–H] bonds in complex organic molecules could facilitate much more efficient preparation of therapeutics and agrochemicals. Here, we report a copper-catalyzed radical relay pathway for enantioselective conversion of benzylic C–H bonds into benzylic nitriles. Hydrogen-atom abstraction affords an achiral benzylic radical that undergoes asymmetric C(sp3)–CN bond formation upon
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