Palladium catalyzed reaction of 2-alkynylanilines with allyl chlorides. Formation of 3-allylindoles
作者:Koji Iritani、Seijiro Matsubara、Kiitiro Utimoto
DOI:10.1016/s0040-4039(00)82047-x
日期:1988.1
Pd(II) catalyzed reaction of N-carbomethoxy-2-alkynylanilines with allylchlorides produces 2-alkyl-3-allyl-N-carbomethoxyindoles in the presence of oxirances; Aminopalladation of a N-carbomethoxy-2-alkynylaniline gives 3-(N-carbomethoxyindolyl)palladium intermediate, which regioselectively attacks on the γ position of chlorides to give 3-allyl-2-alkylindoles with concurrent regeneration of Pd(II)
Hydroformylation of 2-Alkynylanilines: Toward an Alternative Methodology for the Synthesis of 3-Substituted Indoles
作者:Cedric Holzapfel、Etelinda Dasilva、Laetitia Den Drijver、Tyler Bredenkamp
DOI:10.1002/cctc.201600659
日期:2016.9.21
potentially viable route for the synthesis of 3‐substitutedindoles is presented herein. The methodology is based on a regioselective Rh‐catalysed hydroformylation of prepared 2‐alkyn‐1‐ylanilines. The requisite 2‐alkynylaniline substrates were prepared in high yields (>85 %) using the Pd‐catalysed Sonogashira reaction. A catalyst complex that comprises RhI(CO)(PPh3)3 and 1,2‐bis(diphenylphosphino)ethane
paper describes the preparation of indoles, azaindoles and benzofurans in pure water by using a new heterogeneous Pd-Cu/C catalyst through a cascade Sonogashira alkynylation-cyclization sequence. Details of the optimization studies and the substrate scope are discussed. This procedure allows the preparation of heterocycles with good yields and is tolerant to a wide variety of functional groups.
Convenient Indole Synthesis from 2-Iodoanilines and Terminal Alkynes by the Sequential Sonogashira Reaction and the Cyclization Reaction Promoted by Tetrabutylammonium Fluoride (TBAF)
The sequential Sonogashira reaction and the cyclization reaction of various 2-iodoanilines and terminal alkynes in the presence of a palladium catalyst and tetrabutylammonium fluoride (TBAF) gave the corresponding 2-substituted indoles in good yields.
Cupric Halide-Mediated Intramolecular Halocyclization of N-Electron-Withdrawing Group-Substituted 2-Alkynylanilines for the Synthesis of 3-Haloindoles
作者:Zengming Shen、Xiyan Lu
DOI:10.1002/adsc.200900609
日期:2009.12
efficient method for the synthesis of 3-haloindoles has been developed. Both 3-chloro- and 3-bromoindole derivatives can be obtained in high yields by the reaction of N-electron-withdrawinggroup-substituted2-alkynylanilines with cupric halide in dimethyl sulfoxide (DMSO) within a short period of time. Investigation of the reaction mechanism reveals that two equivalents of cupric halide are necessary