Silylation and germylation of trialkylsilyl(germyl)ethoxyacetylenes containing bulky substituents at the silicon or germanium atom were performed. In all cases, the corresponding bis-organoelement-containing ketenes were obtained as the only reaction products. No intermediate isomeric ynol ethers were detected by spectroscopy.
Water as an efficient medium for the synthesis of functionalized enol ethers
作者:Pascal Lemoine、Benoit Daoust
DOI:10.1016/j.tetlet.2008.07.165
日期:2008.10
Herein we report an efficient method for synthesis of beta-alkylated and beta,beta-dialkylated alpha-iodo enol ethers in water. Radical addition in aqueous medium of ethyl iodoacetate, iodoacetonitrile, and iodoacetamide to ynol ethers leads to alpha-iodo enol ethers with moderate to excellent yields and high stereoselectivities. (C) 2008 Elsevier Ltd. All rights reserved.