Catalytic Asymmetric Protonation of Silyl Ketene Imines
摘要:
An efficient catalytic and highly enantioselective protonation of silyl ketene imines is described. The reaction is catalyzed by the chiral phosphoric acids TRIP or STRIP in the presence of a stoichiometric amount of methanol as the proton source and silyl acceptor. A variety of substituted racemic silyl ketene imines have been transformed into highly enantioenriched nitriles.
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.
作者:Linlin Ding、Yue Zhao、Hongjian Lu、Zhuangzhi Shi、Minyan Wang
DOI:10.1002/anie.202313655
日期:2024.1.2
enantioselective propargyl-aryl cross-coupling between two electrophiles was achieved for the first time in a stereoconvergent manner. The potential utility of this conversion is demonstrated in the facile construction of stereoenriched bioactive molecule derivatives and medicinal compounds based on the diversity of acetylenic chemistry. Detailed experimental studies have revealed the key mechanistic features of this
HANNA, GEORGE M.;LAU-CAM, CESAR A., ANALYST, 115,(1990) N, C. 1157-1160
作者:HANNA, GEORGE M.、LAU-CAM, CESAR A.
DOI:——
日期:——
Catalytic Asymmetric Protonation of Silyl Ketene Imines
作者:Joyram Guin、Georgy Varseev、Benjamin List
DOI:10.1021/ja312141b
日期:2013.2.13
An efficient catalytic and highly enantioselective protonation of silyl ketene imines is described. The reaction is catalyzed by the chiral phosphoric acids TRIP or STRIP in the presence of a stoichiometric amount of methanol as the proton source and silyl acceptor. A variety of substituted racemic silyl ketene imines have been transformed into highly enantioenriched nitriles.