The 5-8-5-membered tricyclic diterpene, cycloaraneosene, has been totally synthesized via the stereoselective condensation of two units of optically active iridoids, Cope rearrangement and chemical reduction of the tetrasubstituted C=C bond. The NMR spectrum of synthetic 9α-hydroxycycloaraneosene was not identical with the congener product, and the natural alcohol is likely to be 8β-hydroxyl derivative.
通过立体选择性缩合两个单元的光学活性虹彩、科普重排和四取代 C=C 键的
化学还原,完全合成了 5-8-5 元
三环二萜环胂
烯。合成的 9α-hydroxycycloaraneosene 的核磁共振谱与同系物不完全相同,
天然醇可能是 8β-hydroxyl 衍
生物。