A novel TFA-mediated cyclo-dimerization of 1-substituted 3-alkenylindole derivatives to cyclopent[b]indoles
摘要:
Reaction of 1-substituted 3-alkenyl-1H-indoles with an equimolar amount of trifluoroacetic acid in dichloromethane gave cyclic dimers, 1,3-trans-N,N'-disubstituted cyclopent[b]indoles, in 53-84% yields as sole products through an acid-mediated stereoselective cyclo-dimerization process. The structure of the cyclic dirtier derived from 3-cyclopentylidenemethyl-1-methyl-1H-indole was elucidated by X-ray crystallographic analysis. (c) 2005 Elsevier Ltd. All rights reserved.
β,β-Disubstituted <i>C</i>- and <i>N</i>-Vinylindoles from One-Step Condensations of Aldehydes and Indole Derivatives
作者:Gil Fridkin、Nicolas Boutard、William D. Lubell
DOI:10.1021/jo900526p
日期:2009.8.7
Direct preparation of β,β-disubstituted C- and N-vinylindoles from condensation of aldehydes on indole derivatives is presented. Heating 1-methyl- and 1-benzylindole 3a,b with alkyl and aryl α-branched aldehydes and TFA in acetonitrile using microwave irradiation furnished 3-vinylindoles 1a−e in 18−76% yields. Under similar conditions, 3-substitutedindoles 4a−c provided N-vinylindoles 2a−h in 16−98%
Synthesis of β,β-Disubstituted Styrenes via Trimethylsilyl Trifluoromethanesulfonate-Promoted Aldehyde-Aldehyde Aldol Coupling-Elimination
作者:Grant J. Dixon、Michael R. Rodriguez、Tyler G. Chong、Kevin Y. Kim、C. Wade Downey
DOI:10.1021/acs.joc.2c01458
日期:2022.11.4
α-disubstituted aldehydes condense with electron-rich aromatic aldehydes to yield β,β-disubstituted styrenes. More electron-rich aromatic aldehydes react more rapidly and in higher yield. Preliminary results suggest that the reaction may proceed via the ionization and formal deformylation of an aldol intermediate.
A variety of 3-substituted indoles are prepared from 1-methyl-3-(benzotriazol-1-ylalkyl)indoles (1), which are readily available either from the condensation of 3-methylindole with N-(benzotriazol-1-ylalkyl)carbamates or from the alkylation and silylation of lithiated 1-methyl-3-(benzotriazol-1-ylmethyl)indole (2).
Sensitized photooxygenation of 1-methyl-3-vinylindoles
作者:Masakatsu Matsumoto、Kiyosi Kondo
DOI:10.1021/ja00449a089
日期:1977.3
Intramolecular Addition of a Dimethylamino C(sp3)–H Bond across C–C Triple Bonds Using IrCl(DTBM-SEGPHOS)(ethylene) Catalyst: Synthesis of Indoles from 2-Alkynyl-N-methylanilines
Intramolecular addition of a C(sp3)–H bond of the dimethylamino group across the C–C triple bond in 2-alkynyl-N,N-dimethylanilines is effectively catalyzed by a new iridium complex, IrCl(DTBM-SEGPHOS)(C2H4), in mesitylene at 150 °C. The intramolecular C(sp3)–H addition is followed by double-bond isomerization to afford 3-substituted indoles in good to high yields.