Abstract
Chemical investigation of the MeOH extract from the gorgonian Pseudopterogorgia americana afforded two rare sterols, ameristerenol A (1) and B (2), both 9,11-secosterols containing a seven-membered cyclic enol-ether in ring C, and ameristerol A (3), the first 9,11-secosterol containing a gorgosterol side chain containing an exocyclic methylene group at C-24, along with three related known analogues. Ameristerenol A (1) was converted to semi-synthetic sterols 4-6. The structures of compounds 1-6 were determined on the basis of extensive spectroscopic analysis and by comparison with literature data.
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