Photoinduced chlorine atom-transfer cyclization/photohydrolysis of 3-acyl-2-chloro-N-(ω-phenylalkynyl)pyrroles: a one-pot synthesis of benzoyl-substituted fused pyrroles
作者:Shen-Ci Lu、Wei-Xia Wang、Pan-Liang Gao、Wei Zhang、Zhi-Feng Tu
DOI:10.1039/c1ob05954h
日期:——
A one-potsynthesis of benzoyl-substituted fusedpyrroles or indoles in moderate to high yields has been achieved by the photocyclization/photohydrolysis reactions of N-(ω-phenylalkynyl)-2-chloropyrrole-3-carbaldehydes or 3-acyl-N-(ω-phenylbutynyl)-2-haloindoles in wet acetone. The formation of all these products could be inferred by a two-step reactions, namely, photoinduced chlorine atom-transfer
Chemo- and regioselectivity in the reactions of polyfunctional pyrroles
作者:Gabriella Marth、Rosaleen J. Anderson、Barry G. Thompson、Mark Ashton、Paul W. Groundwater
DOI:10.1016/j.tet.2010.06.006
日期:2010.8
The chemo- and regioselectivity of the reduction, oxidation and Wittig reaction of polyfunctional pyrroles, containing a variety of reactive centres was investigated. The reaction of 3,5-dichloropyrrole-2,4-dicarboxaldehydes with potassium permanganate leads to regioselective oxidation of the 2-formyl group, while the Wittig reaction with 1 equiv of a triphenylphosphorane produced the 2-alkenyl substituted
Synthetic studies on N-acetyl derivatives of amino acids and thiolactone using Vilsmeier-haack reagent
作者:B. Balasundaram、M. Venugopal、Paramasivan T. Perumal
DOI:10.1016/s0040-4039(00)60540-3
日期:1993.6
A variety of N-acetyl derivatives of amino acids have been subjected to Vilsmeier reagent to obtain 2,4-dichloro-3,5-diformylpyrrole and 2-formylmethylene-4-substituted oxazolidin-5-ones. The N-acetyl homo cysteine thiolactone gave 5-chloro-3-formylthieno (2,3-b)pyridine on reaction with Vilsmeier reagent.
Regioselectivity in the reactions of polyfunctionalised pyrroles with nucleophiles
作者:Andrey V. Zaytsev、Rosaleen J. Anderson、Otto Meth-Cohn、Paul W. Groundwater
DOI:10.1016/j.tet.2005.04.009
日期:2005.6
The polyfunctionalised pyrrole, 3,5-dichloro-1H-pyrrole-2,4-dicarbaldehyde reacts with secondary amines by condensation with the 2-carbaldehyde to give methylene-substituted pyrroles, while its N-alkyl derivatives undergo substitution of the 5-chloro group to give 5-substituted pyrroles. (c) 2005 Elsevier Ltd. All rights reserved.