A Free Radical Cascade Silylarylation of Activated Alkenes: Highly Selective Activation of the Si–H/C–H Bonds
作者:Lizhi Zhang、Dong Liu、Zhong-Quan Liu
DOI:10.1021/acs.orglett.5b01067
日期:2015.5.15
The first example of silylarylation of activatedalkenes with silanes is reported via selective activation of the Si–H/C–H bonds, which allows efficient access to silylated oxindoles through a free-radical cascade process.
Visible light-induced radical aryldifluoromethylation of N-arylacrylamides using [bis(difluoroacetoxy)iodo]benzene as a difluoromethylation reagent is reported for the first time. The inexpensive and readily accessible reagents and the mild reaction conditions render this method an alternative and practical strategy for the synthesis of difluoromethyl substituted oxindoles.
Tandem Radical Cyclization for the Construction of Difluoro-Containing Oxindoles and Quinoline-2,4-diones
作者:Fangwei Ding、Yuanding Fang、Yanqiu Jiang、Kaifeng Lin、Lei Shi
DOI:10.1002/asia.201701780
日期:2018.3.16
Cu‐catalyzed direct difluoromethylation of activatedalkenes through a difluoromethyl radical addition/cyclization to afford difluorinated oxindoles and quinoline‐2,4‐diones has been developed. This method provides convenient access to a variety of oxindoles and quinoline‐2,4‐diones under mild conditions via a proposed tandem radical cyclization process, while tolerating various functional groups well
Metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphatic aldehydes: a convenient approach to oxindoles via dual C(sp<sup>2</sup>)–H bond functionalization
作者:Luo Yang、Wen Lu、Wang Zhou、Feng Zhang
DOI:10.1039/c6gc00362a
日期:——
A convenient metal-free cascade oxidative decarbonylative alkylarylation of acrylamides with aliphaticaldehydes to provide quaternary oxindoles is developed.
The catalyst-free electrochemical di- and trifluoromethylation/cyclization of N-substituted acrylamides was realized under external oxidant-free conditions. The strategy provides expedient access to fluoroalkylated oxindoles and 3,4-dihydroquinolin-2(1H)-ones with ample scope and broad functional group tolerance by mild, direct electrolysis of sodium sulfinates in an undivided cell. Detailed mechanistic