Biomimetic Synthesis of (+)‐Ledene, (+)‐Viridiflorol, (−)‐Palustrol, (+)‐Spathulenol, and Psiguadial A, C, and D via the Platform Terpene (+)‐Bicyclogermacrene

(+)‐Bicyclogermacrene is a strained bicyclic and common sesquiterpene found in several essential oils. A short and good yielding synthesis of bicyclogermacrene proceeding in seven steps is reported. This terpene is used as key platform intermediate for a biomimetic access to several aromadendrene sesquiterpenoids, such as ledene, viridiflorol, palestrol, and spathulenol. Furthermore, bicyclogermacrene is shown to be the terpene component in the...