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.
Expedient Syntheses of β-Iodofurans by 5-endo-dig Cyclisations
作者:Sean P. Bew、Gamila M. M. El-Taeb、Simon Jones、David W. Knight、Wen-Fei Tan
DOI:10.1002/ejoc.200700681
日期:2007.12
yields of the corresponding β-iodofurans. The necessary precursors are available from a number of different approaches, notably regioselective bis-hydroxylation of conjugated enynes and the addition of acetylides to α-hydroxy carbonyl groups. The initial iodofurans can be homologated using a number of strategies, ranging from various transition metal-catalysed couplings to halogen-metal exchange and subsequent