A simple and convenient synthesis of substituted furans and pyrroles by CuCl2-catalyzed heterocyclodehydration of 3-yne-1,2-diols and N-Boc- or N-tosyl-1-amino-3-yn-2-ols
作者:Bartolo Gabriele、Pierluigi Plastina、Mabel V. Vetere、Lucia Veltri、Raffaella Mancuso、Giuseppe Salerno
DOI:10.1016/j.tetlet.2010.05.001
日期:2010.7
A simple and economical synthesis of substitutedfurans and pyrroles, by ligand-free CuCl2-catalyzed heterocyclodehydration of readily available 3-yne-1,2-diols and N-Boc- or N-tosyl-1-amino-3-yn-2-ols, respectively, is presented. Reactions are carried out in MeOH at 80–100 °C for 1–24 h and afford the corresponding heterocyclic derivatives in 53–99% isolated yields.
An efficient furan synthesis using heterogeneous catalysis
作者:Simon J. Hayes、David W. Knight、Melanie D. Menzies、Mark O’Halloran、Wen-Fei Tan
DOI:10.1016/j.tetlet.2007.08.102
日期:2007.10
A wide variety of 3-alkyne-1,2-diols have been found to undergo exceptionally clean 5-endo-dig cyclisations followed by dehydration at ambient temperature to give the corresponding furans in essentially quantitative yields when exposed to 10 mol % of 10%,w/w silver(1) nitrate absorbed on silica gel. (C) 2007 Elsevier Ltd. All rights reserved.
Practical alternatives for the synthesis of β-iodofurans by 5-endo-dig cyclisations of 3-alkyne-1,2-diols
作者:Gamila M.M. El-Taeb、Ann B. Evans、Simon Jones、David W. Knight
DOI:10.1016/s0040-4039(01)01112-1
日期:2001.8
Iodocyclisations of 3-alkyne-1,2-diols, obtained from acetylides and a-hydroxy-ketones or esters, give generally excellent yields of beta -iodofurans by 5-endo-dig cyclisation followed by dehydration. (C) 2001 Elsevier Science Ltd. All rights reserved.