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 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
Iron-Catalyzed Radical Methylation of Activated Alkenes with tert-Butanol as the Methyl Source
作者:Zhengbao Xu、Rui Jia、Zhiwei Ma、Shouhao Cao、Liang Shen、Hongfang Ji
DOI:10.1055/s-0039-1690193
日期:2019.10
A free-radical-initiated methylation/addition/cyclization of N-arylacrylamides and a methylation/addition/elimination of quinines have been developed in which t-BuOH is used as a methylsource. These reactions provide effective and selective methods for the synthesis of various methylated oxindoles and quinones in moderate to good yields.
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.