Copper-Catalyzed Enantioselective Radical Chlorination of Alkenes
作者:Dunqi Wu、Wenzheng Fan、Lianqian Wu、Pinhong Chen、Guosheng Liu
DOI:10.1021/acscatal.2c00623
日期:2022.5.6
great challenge since the discovery of racemic ATRA in the 1940s. This enantioselective radical chlorination of acrylamides was developed, where three reagents, including Togni-I and TMSCl, PhICF3Cl, and CX3SO2Cl, were employed as the radical sources and chlorine source, affording a series of chlorinated carbon-centered quaternary compounds in good yields with excellent enantioselectivity. Notably,
Two highly reactive iodoalkenes (1-iodo-1-(2-naphthyl)ethene and 1-iodo-1-(1-naphthyl)ethene) were prepared from the corresponding acetonaphthone isomers via their hydrazones and used as substrates in palladium-catalysed carbonylations. Both iodoalkenyl substrates proved to be highly reactive in the presence of various N-nucleophiles and the corresponding N-substituted naphthylacrylamides were formed chemoselectively in nearly quantitative yields. High isolated yields (up to 93%) were achieved with all types of amines under mild reaction conditions. The alkoxycarbonylation of the above iodoalkenes resulted in esters of unexpectedly good isolated yields (up to 77%). (C) 2009 Elsevier Ltd. All rights reserved.
Electrochemical Difluoromethylation of Electron‐Deficient Alkenes
作者:He‐Huan Xu、Jinshuai Song、Hai‐Chao Xu
DOI:10.1002/cssc.201803058
日期:2019.7.5
Electrochemical 1,2‐hydroxydifluoromethylation and C−H difluoromethylation of acrylamides were developed by using CF2HSO2NHNHBoc as the source of the CF2H group. These electricity‐powered oxidative alkene functionalization reactions do not need transition‐metal catalysts or chemical oxidants. The reaction outcome, 1,2‐difuntionalization or C−H functionalization, is determined by the substituents on
作者:Satavisha Sarkar、Arghya Banerjee、Jagrut A. Shah、Upasana Mukherjee、Nicoline C. Frederiks、Christopher J. Johnson、Ming-Yu Ngai
DOI:10.1021/jacs.2c09006
日期:2022.11.16
Synthesis of α,β-unsaturated-γ-lactams continue to attract attention due to the importance of this structural motif in organic chemistry. Herein, we report the development of a visible-light-induced excited-state copper-catalyzed [4 + 1] annulation reaction for the preparation of a wide range of γ-H, −OH, and −OR-substituted α,β-unsaturated-γ-lactams using acrylamides as the 4-atom unit and aroyl chlorides