Fates of imine intermediates in radical cyclizations of <i>N</i>-sulfonylindoles and ene-sulfonamides
作者:Hanmo Zhang、E Ben Hay、Stephen J Geib、Dennis P Curran
DOI:10.3762/bjoc.11.181
日期:——
imine intermediates formed on radical cyclizations of ene-sulfonamides have been identified, reduction and hydration/fragmentation. Tin hydride-mediated cyclizations of 2-halo-N-(3-methyl-N-sulfonylindole)anilines provide spiro[indoline-3,3'-indolones] or spiro-3,3'-biindolines (derived from imine reduction), depending on the indole C2 substituent. Cyclizations of 2-haloanilide derivatives of 3-carboxy-N-sulfonyl-2
Palladium-Catalyzed Aminocyclization–Coupling Cascades: Preparation of Dehydrotryptophan Derivatives and Computational Study
作者:Belén Vaz、Claudio Martínez、Francisco Cruz、J. Gabriel Denis、Ángel R. de Lera、José M. Aurrecoechea、Rosana Álvarez
DOI:10.1021/acs.joc.1c00636
日期:2021.7.2
Dehydrotryptophan derivatives have been prepared by palladium-catalyzed aminocyclization-Heck-type coupling cascades starting from o-alkynylaniline derivatives and methyl α-aminoacrylate. Aryl, alkyl (primary, secondary, and tertiary), and alkenyl substituents have been introduced at the indole C-2 position. Further variations at the indole benzene ring, as well as the C-2-unsubstituted case, have
Palladium-Catalyzed Cyclization Reaction of <i>o</i>-Iodoanilines, CO<sub>2</sub>, and CO: Access to Isatoic Anhydrides
作者:Wen-Zhen Zhang、Ning Zhang、Yu-Qian Sun、Yu-Wei Ding、Xiao-Bing Lu
DOI:10.1021/acscatal.7b03000
日期:2017.12.1
oxidants. Herein we report a highly selective palladium-catalyzed cyclizationreaction for the efficient synthesis of isatoic anhydrides from readily available o-iodoanilines, CO2, and CO. The reaction proceeds under mild conditions and is redox-neutral. Both CO2 and CO are indispensable C1 building blocks for this catalytic reaction.
Development of an Efficient Procedure for Indole Ring Synthesis from 2-Ethynylaniline Derivatives Catalyzed by Cu(II) Salts and Its Application to Natural Product Synthesis
作者:Kou Hiroya、Shin Itoh、Takao Sakamoto
DOI:10.1021/jo035528b
日期:2004.2.1
The development of efficient methods for the indole synthesis catalyzed by Cu(II) salts and its applications were investigated. Cu(OAc)2 has been proved to be the best catalyst for the synthesis of various 1-p-tolylsulfonyl or 1-methylsulfonylindoles, which have both electron-withdrawing and electron-donating groups on the aromatic ring and C2 position of indoles. For the primary aniline derivatives
A catalyst-free and additive-free method for the synthesis of benzothiazolethiones from <i>o</i>-iodoanilines, DMSO and potassium sulfide
作者:Xiaoming Zhu、Wenguang Li、Xiai Luo、Guobo Deng、Yun Liang、Jianbing Liu
DOI:10.1039/c8gc00477c
日期:——
Under catalyst-free and additive-free conditions, a novel, convenient, environment-friendly method for the synthesis of benzothiazolethiones from o-iodoanilines, K2S and DMSO has been developed.