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.
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.
Regioselective synthesis of benzazetines and indoles from o-alkenylanilides was achieved. The reaction of o-vinylbenzanilide with dimethyl(methylthio)sulfonium trifluoromethanesulfonate (DMTST) gave the corresponding benzazetine in 92% yield, whereas the reaction of o-vinyl-N-p-toluenesulfonylanilide gave N-tosylindoline in 77% yield. 3-Methy-N-p-tosylindole was directly synthesized by the reaction of o-isopropenyl-N-p-tosylanilide with dimethyl disulfide and methyl triflate in 85% yield.
Experimental and Computational Studies on Cp*<sup>Cy</sup>Rh(III)/KOPiv-Catalyzed Intramolecular Dehydrogenative Cross-Couplings for Building Eight-Membered Sultam/Lactam Frameworks
作者:Liping Li、Hui Gao、Ming Sun、Zhi Zhou、Wei Yi
DOI:10.1021/acs.orglett.0c01823
日期:2020.7.17
is an unusual Cp*CyRh(III)-catalyzed intramolecular site-specific aryl C–H annulation, a highly chemoselective protocol providing direct access to eight-membered sultams/lactams with broad substrate/functional group tolerance. Experimental and computational studies reveal that such a transformation involves a unique PivOH-assisted aryl C–H activation/alkene insertion/β-H elimination/hydrogen-transfer
Rhodium(III)‐Catalyzed Annulation of 2‐Alkenyl Anilides with Alkynes through C−H Activation: Direct Access to 2‐Substituted Indolines
作者:Marc Font、Borja Cendón、Andrés Seoane、José Luis Mascareñas、Moisés Gulías
DOI:10.1002/anie.201802830
日期:2018.7.2
A RhIII complex featuring an electron‐deficient η5‐cyclopentadienyl ligand catalyzed an unusual annulation between alkynes and 2‐alkenyl anilides to form synthetically appealing 2‐substituted indolines. Formally, the process can be viewed as an allylic amination with concomitant hydrocarbonation of the alkyne. Mechanistic experiments indicate that this transformation involves an unusual rhodium migration
Cobalt-Catalyzed (3 + 2) Cycloaddition of Cyclopropene-Tethered Alkynes: Versatile Access to Bicyclic Cyclopentadienyl Systems and Their CpM Complexes
作者:Carlos Lázaro-Milla、Eduardo da Concepción、Israel Fernández、José L. Mascareñas、Fernando López
DOI:10.1021/acscatal.4c03080
日期:2024.8.2
Low-valent cobalt complexes can promote intramolecular (3 + 2) cycloadditions of alkyne-tethered cyclopropenes to provide bicyclic systems containing highly substitutedcyclopentadienyl moieties with electronically diverse functional groups. The adducts can be easily transformed into new types of CpRh(III) and CpIr(III) complexes, which show catalytic activity in several relevant transformations. Preliminary
Palladium-Catalyzed Formal (5 + 2) Annulation between <i>ortho</i>-Alkenylanilides and Allenes
作者:Borja Cendón、Noelia Casanova、Cezar Comanescu、Rebeca García-Fandiño、Andrés Seoane、Moisés Gulías、José L. Mascareñas
DOI:10.1021/acs.orglett.7b00467
日期:2017.4.7
2-Alkenyltriflylanilides react with allenes upon treatment with catalytic amounts of Pd(OAc)(2) and Cu(II) to give highly valuable: 2,3-dihydro-1H-benzo[b]azepines, in good yields, and with very high regio- and diastereoselectivities. Density functional theory (DFT) calculations suggest that the C-H activation of the alkenylanilide involves a classical concerted metalation-deprotonation (CMD) mechanism.