Catalyst-free direct arylsulfonylation of N-arylacrylamides with sulfinic acids: a convenient and efficient route to sulfonated oxindoles
作者:Wei Wei、Jiangwei Wen、Daoshan Yang、Juan Du、Jinmao You、Hua Wang
DOI:10.1039/c4gc00231h
日期:——
A catalyst-free procedure has been developed for the construction of sulfonated oxindoles via direct arylsulfonylation of activated alkenes with sulfinic acids.
visible-light-driven cascade cyclization reaction to synthesize 3-methyl-3-acetophenone-2-oxindoles and 3-methyl-3-(methylsulfonyl)benzene-2-oxindoles in yields up to 96% and 99%, via benzoyl and phenylsulfinyl radicals with acrylamide derivatives is reported, respectively. Extensive studies, including gram-scale, radical capture and isotope experiments, were performed to indicate that the reaction may involve a radical