Novel formation of indoles and 3,1-benzoxazines from o-alkenylanilides and dimethyl(methylthio)sulfonium trifluoromethanesulfonate
摘要:
The reaction of dimethyl(methylthio)sulfonium trifluoromethanesulfonate (DMTST) with o-allylphenol gave 2-methylthiomethyl-2,3-dihydrobenzofuran in 97% yield. The reaction of DMTST with N-tosyl-o-isopropenylanilide followed by the addition of aq sodium carbonate afforded N-tosyl-3-methylindole in 88% yield, whereas N-tosyl-o-vinylanilide afforded N-tosylindoline in 85% yield. (c) 2007 Published by Elsevier Ltd.
A new copper-catalyzed oxysulfenylation reaction of enolates with sodium sulfinates has been disclosed. A series of sulfenylated heterocycles including four- and seven-membered cyclic ether were obtained in mild to good yields. This reaction is proposed to go through a radical process, and the sulfur radical (RS•) may be a reactive species.
Methyl(bismethylthio)sulphonium hexachloroantimonate (1a) reacts under mild conditions with 2-allylphenol (3a) to give 2-(methylthiomethyl)-2,3-dihydrobenzofuran (4a). Methylthiolation at position 5 in the heterocycle may also occur. With 4-substituted 2-allylphenols (3b–d)(substituents: methyl,chloro,nitro) only the corresponding 5-substituted 2-(methylthiomethyl)-2,3-dihydrobenzofurans (4b–d) are
An NH4I-promoted and H2O-controlled intermolecular difunctionalization of alkenes for the synthesis of bis-methylsulfane and beta-hydroxysulfides is presented. Mechanistic investigation revealed the reaction proceeds via methylthiyl radical addition to C=C of alkenes to give a carbon-centered radical and immediately cyclize to a thiiranium ion, followed by combination with H2O to afford beta-hydroxysulfides in 52-89% yields with chemo- and regioselectivities. In the absence of water, 1,2-disulfenylation takes place to give bis-methylsulfane in moderate to good yields.
CAPOZZI, G.;LUCCHINI, V.;MARCUZZI, F.;MODENA, G., J. CHEM. SOC. PERKIN TRANS., 1981, N 12, 3106-3110
作者:CAPOZZI, G.、LUCCHINI, V.、MARCUZZI, F.、MODENA, G.