Abstractmagnified imageA new Lycopodium alkaloid, lycoposerramine‐R, possessing an unusual tetracyclic ring system, was isolated from Lycopodium serratum. Its structure as well as those of three new co‐existing fawcettimine‐related alkaloids were elucidated by means of extensive spectroscopic analysis.
Syntheses of (±)-Serratine, (±)-Lycoposerramine T, and (±)-Lycopoclavamine B
摘要:
The first total syntheses of (+/-)-serratine, (+/-)-lycoposerramine T, and (+/-)-lycopoclavamine B have been accomplished. The functionalized octahydroindane skeleton of these natural products was constructed by an efficient Diels-Alder reaction of an alpha-alkynylcyclopentenone and the stereoselective introduction of a tertiary hydroxyl group. Two of these natural products were divergently synthesized from the same synthetic intermediate at a later stage.