Two unusual minor 18,19-seco-ursane glycosides from leaves of Ilex cornuta

文献类型： 外文期刊

第一作者： Wu, Tao

作者： Wu, Tao;Li, Yan;Wang, Zheng-tao;Tang, Qing-jiu

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关键词： llex cornuta;18;19-seco-ursane glycosides;cornutaoside A;cornutaoside B

期刊名称：FOOD CHEMISTRY （ 影响因子：7.514； 五年影响因子：7.516 ）

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收录情况： SCI

摘要： The leaves of Ilex cornuta is traditionally used as a functional tea in China. Two new minor 18,19-seco-ursane glycosides, named cornutaoside A (1) and B (2), were isolated from leaves of I, comuta, along with two known compounds (3 and 4). Their structures were elucidated as (3β,12β,)-3-[β-D-glucopyranosyl-(1 → 2)-α-L-arabinopyranosyl]-12,21-dihydroxy-19-oxo-18,19-secours-13(18)-en-28-oic acid (1) and (3β,12β)-3-[β-D-glucopyranosyl-(l →2)-α-L-arabinopyranosyl]-12,19,21-trihydroxy-18,19-secours-13(18)-en-28-oic acid (2), by chemical methods, ID and 2D NMR experiments, and by comparison with known analogues. This is the first report of E-seco triterpenoids and diterpene skeletons (4) from this plant. In a preliminary cytotoxic test against U937, L1210, and B16 cell lines, 1 and 2 had no significant activities as compared to controls, with concentrations up to 443.61 and 346.25 μM/plate, for 1 and 2, respectively.

分类号： TS201`TS264`TS201.2

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