57 アンダマン、ニコバー産の軟サンゴ、スポンジ、紅藻から得られたステロイドの構造(ポスター発表の部)
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概要
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An unique degraded sterol (1) was obtained from a red alga Laurencia obtusa. It was shown to be 2a-oxa-2-oxo-5α-hydroxy-3,4-dinorcholestane from the spectroscopic evidences and was confirmed by synthesis from cholestenone (2b). The sponge Dysidea herbacea was found to contain a series of steroids having a common 3-oxo-4,6,8(14)-triunsaturated steroid nucleus (3a-3j). The components were isolated by HPLC and the side chain structures were assigned by comparison with those of the conventional 3β-hydroxysterols. The first ergostane-type C-21 carboxylic acid (4a) was obtained from the Sclerophytum sp. of soft coral. The structure was determined by correlating to ergostanol (6b) and ergostane (6a). 24-Methylenecholestane-1α, 3β, 5α, 6β, 16β-pentol (11) was isolated from a Sinularia sp. soft coral. The structure was derived considering the 16β-OH substituent effect on its known 16-deoxy derivative (10). Ergost-5-en-3β, 7α-diol(12), 23-demethylgorgost-7-ene-3β, 5α, 6β-triol (14a) and ergostane-3β, 5α, 6β, 7β, 15β-pentol(16) were isolated from the soft corals, Sclerophrtum sp., Sinularia sp., and Lobophytum crassum, respectively. The structures were deduced by comparison of the spectral data with those of the reference compounds having the same partial structure. 1β-Hydroxyandamansterol (17) was isolated from the soft coral Lobophytum strictum The structure was derived from the common ^<13>C-NMR chemical shifts with andamansterol (18) and the increased pyridine-induced shift of 19-H_3 as compared with that of (18).
- 天然有機化合物討論会の論文
- 1992-09-10
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