Spirostanol tetraglycosides from Ypsilandra thibetica |
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| Authors: | Yi Lu Chang-Xiang Chen Wei Ni Hai-Yang Liu |
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| Institution: | a State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, PR China
b Faculty of Natural Resources, Southwest Forestry University, Kunming 650224, PR China |
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| Abstract: | Phytochemical reinvestigation on the whole plants of Ypsilandra thibetica obtained five new spirostane glycosides, ypsilandrosides H-L (1-5), and a known saponin polyphylloside III (6). Among them, 1 and 2 are the first spirostane glycosides which possess novel 5(6 → 7) abeo-steroidal aglycones. Compounds 3 and 4 are rare saponins whose aglycones contain a hydroxyl group at C-7. Their structures were elucidated on the basis of MS, 1D and 2D NMR spectroscopic analysis and chemical evidences. The isolated compounds were evaluated for their cytotoxic activity on five tumor cell lines. |
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| Keywords: | Ypsilandra thibetica Liliaceae Spirostanol saponins Ypsilandrosides H-L |
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