Copper-catalyzed imination of sulfoxides and sulfides
作者:Yuanyuan Liu、Hanying Wang、Xianjin Yang
DOI:10.1016/j.tet.2019.07.020
日期:2019.8
and sulfilimines have attracted considerable interest among organic chemists. The Cu(II)-catalyzed imination of sulfoxides and sulfides using various N-fluoro benzenesulfonamides was investigated in this study. The scope of the reaction was demonstrated by using several substituted sulfides and sulfoxides. The flow strategy for the preparation of NH-sulfoximines was also examined. By trapping nitrene
Enantioselective Fluorination of 2-Oxindoles by Structure-Micro-Tuned<i>N</i>-Fluorobenzenesulfonamides
作者:Fajie Wang、Juli Li、Qingyang Hu、Xianjin Yang、Xin-Yan Wu、Haoming He
DOI:10.1002/ejoc.201402072
日期:2014.6
attempts to fine-tune the reactivity and selectivity of N-fluorobenzenesulfonamide in fluorination reactions by changing the substituents on its phenyl rings. A series of N-fluorobenzenesulfonamides bearing substituents at the ortho, meta, and para positions were prepared, and were used in the enantioselectivefluorination of 2-oxindoles catalysed by chiral palladium complexes. Fluorinating reagents 1b
The first copper-catalyzed imidovinylation of alkynes has been developed, which grants facile access to various (E)-2-imido-2,4-dienals with high stereoselectivity under mild conditions. This transformation also represents the first 1,3-carbon migration of propargylic alcohols and their derivatives.
作者:Xiao-Qiu Pu、Hai-Yong Zhao、Ze-Hai Lu、Xiao-Peng He、Xian-Jin Yang
DOI:10.1002/ejoc.201600709
日期:2016.9
A novel catalyst-free aminochlorination of alkenes was developed by the direct addition of alkenes to N-chloro-N-fluorobenzenesulfonamide (CFBSA). The reaction produces 2-chloro-3-fluoramino and 3-chloro-2-fluoroamino adducts in 1,2-dichloroethane under reflux and dichloromethane at room temperature, respectively, in a regioselective manner. The electronic and steric effects of the fluorine atom of
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