An FeCl2-promoted carbomethylation of arylacrylamides by di-tert-butyl peroxide (DTBP) is achieved, leading to 3-ethyl-3-substituted indolin-2-one in high yield. The reaction tolerates a series of functional groups, such as cyano, nitro, ethyloxy carbonyl, bromo, chloro, and trifluoromethyl groups. The radical methylation and arylation of the alkenyl group are involved in this reaction.
Metal-Free Synthesis of Oxazolidine-2,4-diones and 3,3-Disubstituted Oxindoles via ICl-Induced Cyclization
作者:Wei Yi、Xing-Xiao Fang、Qing-Yun Liu、Gong-Qing Liu
DOI:10.1002/ejoc.201801250
日期:2018.12.19
A metal‐free method for the construction of oxazolidine‐2,4‐diones and oxindoles is reported herein. The resulting products can be used as key intermediates in synthesis of bioactive compounds such as toloxatone, (±)‐esermethole, and (±)‐physostigmine.
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.
Silver-Catalyzed Carboazidation of Arylacrylamides
作者:Xiao-Hong Wei、Ya-Min Li、An-Xi Zhou、Ting-Ting Yang、Shang-Dong Yang
DOI:10.1021/ol402138y
日期:2013.8.16
inexpensive method of nontoxic, silver-salt-catalyzed carboazidation of arylacrylamides to afford corresponding azide oxindoles is reported. This reaction system exhibits great functional group tolerance. All products form a crucial skeleton for the synthesis of various indole alkaloids.
Synthesis of CF2H-containing oxindoles via photoredox-catalyzed radical difluoromethylation and cyclization of N-arylacrylamides
作者:Mei Zhu、Qingqing You、Rongxia Li
DOI:10.1016/j.jfluchem.2019.109391
日期:2019.12
difluoromethylation/cyclization of N-aryl acrylamides using difluoromethyl benzo[d]-thiazol-2-yl sulfone as the difluoromethylating reagent has been developed under mild conditions. This approach allows the synthesis a variety of useful CF2H-containing oxindoles in good to excellent yields. In addition, the photocatalytic difluoromethylation of methacryloyl benzamides and ortho-cyanoarylacrylamides via a similar