Lithiated 3-tosylpropanal and 4-tosyl-2-butanone dimethyl acetals as β-acylvinyl anion equivalents for the synthesis of unsaturated 1,4-dicarbonyl compounds and α,β-butenolides
作者:Pedro Bonete、Carmen Nájera
DOI:10.1016/0040-4020(95)00026-5
日期:1995.2
chlorides affords, after p-toluenesulfinic acid elimination, ene-1,4-dicarbonyl compounds in a stereoselective manner. In the case of compound 7a, derived from acrolein, sequential monolithiation and reaction with carbonyl compounds give cyclicacetals, which after oxidation and elimination of p-toluenesulfinic acid are transformed into α,β-butenolides.
Grignard reagents react with 7-oxabicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic anhydride and produce in high yields the corresponding substituted bicyclo-γ-butanolides. These lactones produce the title compounds by retro Diels-Alder reaction during distillation.
The reaction of photochemically generated α-hydroxyalkyl radicals with alkynes: a synthetic route to γ-butenolides
作者:Niall W.A. Geraghty、Elaine M. Hernon
DOI:10.1016/j.tetlet.2008.11.067
日期:2009.2
and their subsequent carbon-carbon bond forming reaction with propiolate esters and acetylenedicarboxylates, gives a mixture of a β-(hydroxyalkyl)enoate, the result of a formal cis addition, and the unsaturated lactone (γ-butenolide) resulting from the spontaneous cyclization of the corresponding trans addition product. Treatment of the cis adduct with NBS converts it to the same lactone, and so the
A new method for the preparation of 3,5-disubstituted butenolides
作者:Stephen L. Buchwald、Qun Fang、Susan M. King
DOI:10.1016/0040-4039(88)85185-2
日期:1988.1
A convenient method for the transformation of suitably protected propargyl alcohols into 3,5disubstiuted butenolides has been developed. This organozirconium-based method transforms optically active propargyl alcohols into the corresponding butenolides with no loss of optical activity.