Fuscosides A-D: anti-inflammatory diterpenoid glycosides of new structural classes from the caribbean gorgonian Eunicea fusca
摘要:
Four new diterpenoid arabinose glycosides, fuscosides A-D (1,3,5, and 6), have been isolated from the Caribbean gorgonian Eunicea fusca Duchassaing and Michelotti. Fuscoside A (1) is a diterpenoid 2'-O-acetylarabinose glycoside possessing a new bicyclic carbon skeleton related in biosynthetic origin to the eremophilane class of sesquiterpenoids. The structures of these new compounds were assigned on the basis of chemical and spectral studies. Fuscosides A and B (1, 3) are effective topical antiinflammatory agents with potencies equivalent to indomethacin and manoalide. Fuscoside B (3) selectively inhibits the synthesis of leukotrienes LTB4 and LTC4, but not PGE2, in the mouse peritoneal macrophage, suggesting it is a selective inhibitor of leukotriene synthesis.