A sequence of cycloadditions of (diethoxyphosphinyl)acetonitrile oxide with α,β-unsaturated esters, the Raney Ni reduction of the resulting cycloadducts, the Horner–Emmons olefination, and the carbonyl reduction with sodium borohydride leads to 5-[(E)-1-alkenyl]-3-hydroxy-4,5-dihydro-2(3H)-furanones which can be converted into (Z)-5-alkylidene-2(5H)-furanones in two steps.
(二乙氧基膦基)
乙腈氧化物与α,β-不饱和酯的一系列环加成,所得环加合物的雷尼
镍还原,霍纳-埃蒙斯烯化,以及
硼氢化钠的羰基还原得到5-[(E)-1 [-链烯基]-3-羟基-4,5-二氢-2(3H)-
呋喃酮,其可分两步转化为(Z)-5-亚烷基-
2(5H)-呋喃酮。