Ionic liquid promoted interrupted Feist–Benary reaction with high diastereoselectivity
作者:Brindaban C. Ranu、Laksmikanta Adak、Subhash Banerjee
DOI:10.1016/j.tetlet.2008.05.083
日期:2008.7
A basic ionic liquid, 1-butyl-3-methylimidazolium hydroxide promotes the interrupted Feist-Eenary reaction at room temperature under organic solvent-ftee conditions to produce a variety of substituted hydFOxydihydrofurans. The hydroxydihydrofurans are converted to furans (Feist-Benary products) using the ionic liquid, 1-methyl-3-pentylimidazolium bromide at 70-75 degrees C. The reactions are very clean, high yielding and highly stereoselective. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of furan and dihydrofuran derivatives via Feist–Benary reaction in the presence of ammonium acetate in aqueous ethanol
An efficient synthesis of dihydrofurans and furans by a reaction between 1,3-dicarbonyl compounds and ethyl bromopyruvate, ethyl 2-chloroacetoacetate, or 3-chloroacetylacetone in the presence of ammonium acetate in aqueous ethanol is described. When the reaction was performed with a phenacyl bromide, O-alkylation of 1,3-dicarbonyl compounds occurred without cyclization.