Enantioselective Copper-Catalyzed Alkynylation of Benzylic C–H Bonds via Radical Relay
作者:Liang Fu、Zhihan Zhang、Pinhong Chen、Zhenyang Lin、Guosheng Liu
DOI:10.1021/jacs.0c05373
日期:2020.7.15
The first enantioselective alkynylation of benzylic C-H bonds via copper-catalyzed radical relay has been established herein, which provides an easy access to structurally diverse benzylic alkynes in good yields with excellent enantioselectivities. A key step for the asymmetriccopper-catalyzed radical relay process is the enantioselective capture of a benzylic radical with chiral (Box)CuII-alkynyl
facile access to various opticallyactive α-arylpropionic acids including several nonsteroidal anti-inflammatory drugs (NSAIDs) of commercial importance. (R,R)-QuinoxP* is specifically able to induce chirality when compared to analogous P-chiral ligands that give racemic products, highlighting the critical importance of transmetalation in the present asymmetric cross-coupling system.