Intramolecular [2 + 2]- Photocycloaddition/Thermal Fragmentation Approach toward 5−8−5 Ring Systems

This is the authors' abstract. We don't add key points for this paper.

[reaction: see text]. An intramolecular [2 + 2]-photocycloaddition is used to provide a photoadduct, which upon fragmentation, lactone cleavage, and subsequent Cope rearrangement provides a dicyclopenta[a,d]cyclooctene ring system with substituents in place (e.g., C3 and C11) to access several 5-8-5 diterpene and sesterterpene natural products.