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Two biologically active noroleanane saponins from Celmisia petriei are identified as 3-O-(α-l-arabinopyranosyl (1 → 6)-β-d-glucopyranosyl (1 → 2)-α-l-arabinopyranosyl), 2β,17,23-trihydroxy-28-norolean-12-en-16-one and its 2″-O-acetyl derivative. 13C NMR and T1 measurements allowed the determination of the sugar sequence and the majority of the linkage positions, but gave ambiguous results for the inner arabinose sugar. The structure of camellenodiol is revised to 3β,17-dihydroxy-28-norolean-12-en-16-one. 相似文献
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Two new triterpenoids from the flowers of Camellia japonica have been identified as 3β,18β-dihydroxy-28-norolean-12-en-16-one and 18β-hydroxy-28-norolean-12-ene-3,16-dione. A large amount of 3β-hydroxy-28-noroleana-12,17-dien-16-one was also obtained. 相似文献
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