Indium-HI-mediated one-pot reaction of 1-(2-arylethynyl)-2-nitroarenes to 2-arylindoles
摘要:
While 1-(2-arylethynyl)-2-nitroarenes were reduced to 2-(2-arylethynyl)anilines in the presence of indium and InCl3 in THF/H2O (v/v = 5/1) at 50 degrees C, 1-(2-arylethynyl)-2-nitroarenes were reductively cyclized to 2-arylindoles with good yields in the presence of indium and aqueous HI in benzene. (C) 2008 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Ligand-Free Double Cyclization Reactions for the Synthesis of 3-(1′-Indolyl)-phthalides
作者:Shuo Yuan、Dan-Qing Zhang、Jing-Ya Zhang、Bin Yu、Hong-Min Liu
DOI:10.1021/acs.orglett.9b04241
日期:2020.2.7
heterocyclic scaffolds in numerous natural products and bioactive molecules. The synthesis and biological evaluation of the compounds combining these two scaffolds have rarely been reported. Herein, we repot the first palladium-catalyzed ligand-free double cyclization reactions that enable efficient synthesis of 3-(1'-indolyl)-phthalides (42 examples, up to 96% yield) under mild conditions. Notably
Palladium-catalyzed <i>C</i>-glycosylation and annulation of <i>o</i>-alkynylanilines with 1-iodoglycals: convenient access to 3-indolyl-<i>C</i>-glycosides
作者:Jianchao Liu、Xiao Xiao、Puren Han、Huiwen Zhou、Qi-Shuang Yin、Jian-Song Sun
DOI:10.1039/d0ob01812k
日期:——
2-glycosides through a palladium-catalyzed annulation/C-glycosylation sequence of o-alkynylanilines with 1-iodoglycals has been developed. This methodology has a wide scope of substrates and gives access to 3-indolyl-C-Δ1,2-glycosides in high yields. Furthermore, the product obtained here exhibits a high utility for further transformations.
Electrochemical reduction of fluoroalkyl sulfones for radical fluoroalkylation of alkenes
作者:Xin Zhou、Chuanfa Ni、Ling Deng、Jinbo Hu
DOI:10.1039/d1cc03258e
日期:——
Radical fluoroalkylation of alkenes has been developed by electrochemical reduction of fluoroalkyl sulfones. A series of electron-deficientalkenes readily undergo hydrofluoroalkylation in good to excellent yields. This chemistry represents the first example of electrochemical generation of fluoroalkyl radicals from sulfones, which are used for practical radical fluoroalkylation of organic compounds
Copper-catalyzed tandem reaction of 2-alkynylanilines with benzoquinones: efficient access to 3-indolylquinones
作者:Raveendra Jillella、Chang Ho Oh
DOI:10.1039/c8ra03712d
日期:——
A simple, mild, catalytic and efficient method for the straightforward synthesis of an interesting class of 2-aryl/alkyl-substituted-3-indolyl quinones in good to high yields is reported for the first time. This atom-efficient method proceeds via copper-catalyzed one-pot sequential intramolecular hydroamination (C–N bond formation) of 2-alkynylanilines followed by oxidative C–C coupling with benzoquinones
A highly efficient method for the synthesis of indoles has been successfully developed via a CuMgAl-LDH-catalyzed intramolecular annulation reaction of 2-alkynylsulfonanilides. This CuMgAl-LDH catalyst features facile preparation, recovery, and reuse at least seven times without a marked loss in the catalytic activity, as well as the unique dual activation. Moreover, the crystal structures and Hirshfeld