Palermo J A, Brasco M F, Hughes E A, Seldes A M, Balzaretti V T, Cabezas E
Departamento de Química Orgánica, Universidad de Buenos Aires, Argentin
Steroids. 1996 Jan;61(1):2-6. doi: 10.1016/0039-128x(95)00167-o.
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.
对巴塔哥尼亚被囊动物仙人掌波利佐阿的甾醇成分进行了检测，鉴定出24种具有δ5、δ7或δ0核的化合物。其中两种，罕见的20-甲基孕甾-5-烯-3β-醇和20-乙基孕甾-5-烯-3β-醇，以前未被报道为来自被囊动物的天然产物。这些化合物仅作为痕量成分存在；因此，通过从合适的前体合成以及比较合成化合物和天然化合物的光谱和色谱常数来确认它们的结构。
