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
Copper-Catalyzed Oxidative Carbamoylation of <i>N</i>
-Arylacrylamides with Hydrazinecarboxamides Leading to 2-(Oxindol-3-yl)acetamide<b>s</b>
作者:Zeng-Yang He、Jing-Yu Guo、Shi-Kai Tian
DOI:10.1002/adsc.201800012
日期:2018.4.3
radical carbamoylation/cyclization reaction of N‐arylacrylamides with hydrazinecarboxamides has been developed for facile access to 2‐(oxindol‐3‐yl)acetamides, which had been utilized as precursors in the synthesis of natural bioactive pyrrolidinoindolines. In the presence of 1 mol% of copper(II) carbonate and 4 equiv. of tert‐butyl hydroperoxide, a wide range of N‐arylacrylamides underwent highly regioselective
Visible-light-induced and iron-catalyzed methylation of N-arylacrylamides with dimethyl sulphoxide: a convenient access to 3-ethyl-3-methyl oxindoles
作者:Zuguang Xie、Pinhua Li、Yu Hu、Ning Xu、Lei Wang
DOI:10.1039/c7ob00779e
日期:——
A visible-light-induced and iron-catalyzed methylation of arylacrylamides by dimethyl sulphoxide (DMSO) is achieved, leading to 3-ethyl-3-methyl indolin-2-ones in high yields. This reaction tolerates a series of functional groups, such as methoxy, trifluoromethyl, cyano, nitro, acetyl and ethyloxy carbonyl groups. The visible-light promoted radical methylation and arylation of the alkenyl group are
A silver-catalyzed oxidative decarboxylative gem-difluoromethylenation of difluoroacetates with activatedalkenes under mild reaction conditions has been developed. This radical cascade reaction provides a new method for construction of a variety of gem-difluoromethylenated oxindoles.