The isolation and structure determination of pregna-1,4,20-trien-3-one (1) and a related sterol, pregna-5, 20-dien3β-ol (2) from an Alcyonacean coral, Gersemia rubiformis are described. These compounds were synthesized from appropriate steroid precursors and the orientation of the C-3 hydroxy-function unambiguously established by preparation of the epimer, pregna-5,20-dien-3α-ol.
J. F. Kingston, B. Gregory and A. G. Fallis, J. Chem. Soc., Perkin Trans. 1, 1979, 2064 DOI: 10.1039/P19790002064
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