A facile route to 5-alkyl-2(3H)-furanones by photoisomerisation of enedicarbonyl compounds
作者:M. D'Auria、A. De Mico、G. Piancatelli、A. Scettri
DOI:10.1016/0040-4020(82)80143-9
日期:1982.1
A new and useful synthesis of a title compounds is reported. They can be obtained easily by photocyclization of enedicarbonyl compounds 3 and 4. A different behaviour, ascribed to the geometry of a double bond, is observed; 3 are converted only to butenolides 5, while trans-isomers 4 are converted into alkyl-furyl-ketones 5 and 6. A possible mechanism is described.
报道了标题化合物的新的和有用的合成。它们可以通过烯二羰基化合物3和4的光环化而容易地获得。观察到归因于双键的几何形状的不同行为。图3中的化合物仅转化为丁烯内酯5,而反式异构体4则转化为烷基-呋喃酮5和6。描述了一种可能的机制。