β-Lithiooxyphosphonium ylides, generated in situ from aldehydes and Wittig reagents, react readily with halomethyl esters to form trisubstituted Z-allylic esters. The methodology was applied to a total synthesis of the geranylgeraniol-derived diterpene (6S,7R,Z)-7-hydroxy-2-((E)-6-hydroxy-4-methylhex-4-enylidene)-6,10-dimethylundec-9-enyl acetate (12).
由醛和Wittig试剂就地生成的β-Lithiooxyphosphoniumylides,很容易与卤代甲基酯反应形成三取代的Z-烯丙基酯。该方法学应用于香叶基
香叶基香叶醇衍生的二萜(6 S,7 R,Z)-7-羟基-2-((E)-6-羟基-4-甲基己基-4-烯叉基)-6的全合成, 10-二甲基
十一碳烯-9-
乙酸乙烯酯(12)。