Nucleophilic-type radical cyclizations of indoles: conversion of 2-cyano 3-substituted indoles to spiro-annelated indolines and tetrahydrocarbazolones
摘要:
Oxidative photocyclizations of appropriate 2-anilino alkenenitriles (6) afforded a series of indole-2-carbonitriles (7) having bromoalkyl substituents at the C-3 positions. Upon treatment with Bu3SnH, these indolecarbonitriles underwent intramolecular cyclizations either by attack at the C-3 positions of the indole rings to give the spiro-annelated indolinecarbonitriles or by attack at the cyano group to give carbazolone derivatives.
Yang, Chau-Chen; Fang, Jim-Min, Journal of the Chemical Society. Perkin transactions I, 1992, # 22, p. 3085 - 3094
作者:Yang, Chau-Chen、Fang, Jim-Min
DOI:——
日期:——
2-(N-Methylanilino)-2-phenylthioacetonitrile: a useful reagent for preparation of conjugated α-amino alkenenitriles via tandem alkylation and dehydrosulphenylation
作者:Jim-Min Fang、Chin-Cheng Chen
DOI:10.1039/p19900003365
日期:——
Alkylation of the anion of 2-(N-methylanilino)-2-phenylthioacetonitrile 1 with halogenoalkanes resulted in concurrent elimination of benzenethiol to give conjugated alpha-aminoalkenenitriles of 2E-configuration. Counterattack by bromide and benzenethiolate ions was observed in the prolonged reactions of 1 with 1,4-dibromobut-2-ene and 3-bromo-1-(trimethylsilyl)prop-1-yne.
2-(N-methylanilino)-2-phenylsulfanylacetonitrile, a reagent tested for electrophilic, nucleophilic and radical reactions
2-(N-Methylanilino) -2-phenylsulfanylacetonitrile 1 has been readily prepared from 2-(N-methylanilino)acetonitrile and diphenyl disulfide. Alkylation of the anion of 1 with halogenoalkanes resulted in concurrent elimination of benzenethiol to give conjugated alpha-aminoalkenenitriles of 2E-configuration. Autoxidation of 1 in the presence of alkoxide ions afforded alkyl N-methyl-N-phenylcarbamates. Nucleophilic substitution of 1 with Grignard reagent or appropriate silyl compounds were promoted by Cul or Lewis acids to give varied alpha-amino nitriles. The 4-oxo-2-amino nitriles 9 obtained by condensation of 1 and titanium enolates can be considered as derivatives of 1,3-dicarbonyl compounds with the aldehyde group being activated to give an amino nitrile umpolung. When 1 was treated with tributylstannane, the corresponding amino nitrile alpha-radical was formed and the self-coupling product was isolated.
CHUANG, TSUNG-HSUN;YANG, CHAU-CHEN;CHANG, CHIH-JUNG;FANG, JIM-MIN, SYNLETT.,(1990) N2, C. 733-734