(E)-3-(4-methoxy-5-methyl-2-oxo-2H-pyran-6-yl)prop-2-enyl(triphenyl)phosphonium bromide 、
(E,E)-5-(5α-ethyl-3β,4α-dihydroxy-2β,4β-dimethyltetrahydrofuran-2α-yl)penta-2,4-dienal 在
正丁基锂 作用下,
生成 6-((E,Z,E,E)-8-<(5α-ethyl-3β,4α-dihydroxy-2β,4β-dimethyltetrahydrofuran-2α-yl)>octa-1,3,5,7-tetraenyl)-4-methoxy-5-methyl-2-pyrone 、 6-((E,E,E,E)-8-<(5α-ethyl-3β,4α-dihydroxy-2β,4β-dimethyltetrahydrofuran-2α-yl)>octa-1,3,5,7-tetraenyl)-4-methoxy-5-methyl-2-pyrone