Preparation of the tertiary allylic alcohols 17–22, follwed by subjection of these substances to the Still–Mitra [2,3]-sigmatropic rearrangement sequence, provides the functionalised bicyclo[4.3.0]nonanes 23–26; acquisition of 26; points to a strategy for the synthesis of C-19 oxygenated cyathane-type diterpenoids.
制备三级
烯丙醇17-22,然后将这些物质进行Still-Mitra [2,3]-sigmatropic重排,得到官能化的双环[4.3.0]
壬烷23-26;获得26;为C-19氧化的杯状二
萜类化合物的合成提供了一种策略。