Condensations of γ-Acetylacetonephosphonium Ylide (1-(Triphenylphosphoranylidene) pentane-2,4-dione) with Carbonyl Compounds

被引：0

作者：

Cornelis M. Moorhoff

机构：

[1] Department of Chemistry,

[2] University of Tasmania,undefined

[3] GPO Box 252-75C,undefined

[4] Hobart,undefined

[5] Tasmania,undefined

[6] Australia 7001,undefined

来源：

Monatshefte für Chemie / Chemical Monthly | 2003年 / 134卷

关键词：

Keywords. γ-Acetylacetonephosphonium ylide; 1-(Triphenylphosphoranylidene)pentane-2,4-dione; Unsaturated 2,4-diketone; 4-Hydroxy-2-oxo-3,5-diene; 4-Hydroxy-2-oxo-3,5,7-triene; Michael Wittig condensation.;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

2,4-Dioxopentyltriphenylphosphonium bromide reacted with aqueous sodium hydrogencarbonate in dichloromethane to give, in almost quantitative yield, 1-(triphenylphosphoranylidene) pentane-2,4-dione. Dianion Wittig- and Michael Wittig condensations of the last mentioned phosphonium ylide with carbonyl compounds gave unsaturated 2,4-diketones which were almost totally enolised in deutero chloroform as 4-hydroxy-2-oxo-3,5-dienes (24–70% yields). These products closely resembled the type of compounds derived from similar condensations with alkyl 3-oxo-4-(triphenylphosphoranylidene)butanoate.

引用

页码：429 / 434

页数：5