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Short side chain sterols from the tunicate Polizoa opuntia
J A Palermo1, M F Brasco, E A Hughes
1Departamento de Química Orgánica, Universidad de Buenos Aires, Argentin
Steroids
|January 1, 1996
Abstract:
The sterol composition of the Patagonian tunicate Polizoa opuntia was examined, and twenty-four compounds were identified as having either a delta 5, delta 7, or delta 0 nucleus. Two of them, the rare 20-methylpregn-5-en-3 beta-ol and 20-ethylpregn-5-en-3 beta-ol, were previously unreported as natural products from tunicates. These compounds were present only as trace components; therefore, their structures were confirmed by synthesis from suitable precursors and by comparison of the spectral and chromatographic constants of the synthetic and natural compounds.