Intramolecular cyclisation of acyclic triene esters derived from dichloromaleic anhydride affords bicyclic lactones, which by dechlorodecarboxylation, dechlorination or dehydrochlorination are readily elaborated to give novel unsaturated lactones.
衍生自二
氯马来酸酐的无环
三烯酯的分子内环化得到双环内酯,通过脱
氯脱羧,脱
氯或脱
氯化氢可以很容易地制备双环内酯,从而得到新的不饱和内酯。