Briarane, Erythrane, and Aquariane Diterpenoids from the Caribbean Gorgonian Erythropodium caribaeorum

摘要

Seven new diterpenoids belonging to the briarane [erythrolides R (5), S (6), T (7), and U (8), erythrane [erythrolide V (9), and aquariane [aquatiolides B (10) and C (11)] skeletal classes have been isolated from the encurusting gorgonian Erythropodium caribaeorum. The structures of the new compounds were elucidated by spectroscopic analysis and chemical interconversions. A biogenetic proposal that links carbon skeletons found in E. caribaeorum diterpenoids is presented.