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Communication | Special issue | Vol 17, No. 1, 1982, pp.167-170
Published online, 1st January, 1970
DOI: 10.3987/S-1982-01-0167
Furanoditerpenoids from the Dorid Nudibranch Casella atromarginata

E. Dilip de Silva and Paul J. Scheuer*

*Department of Chemistry, University of Hawaii at Manoa, 2545 Tha Mall, Honolulu, Hawaii 96822-2275, U.S.A.

Abstract

The structures of six furanoditerpenoids isolated from a nudibranch, Casella atromarginata, were determined by spectral analysis and chemical interrelation. Two of the compounds, 1 and 5, are known sponge metabolites of Australian Spongia spp.; two more, 2 and 6, represent minor structural variants; and two, 3 and 4, are characterized by a more highly oxidized A-ring, which bears a monoenolized α-diketone function.