P-19 Allium karatavienseおよびEranthis cilicicaより単離された新規高極性ステロイドならびにトリテルペン配糖体の化学構造に関する研究(ポスター発表の部)

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Systematic phytochemical screenings have been performed on land plants with attention paid to their glycoside constituents, which have resulted in the isolation of a variety of steroidal glycosides from Liliaceae plants and triterpene glycosides from Ranunculaceae plants. In our continuous studies on new highly-polar steroidal and triterpene glycosides from Liliaceae and Ranunculaceae plants, we have now examined the fresh bulbs of Allium karatavience and the fresh tubers of Eranthis cilicica. Five steroidal bisdesmosides (1-5), including four new compounds (1-4), were obtained from the MeOH extract of the bulbs of A. Karatavience, and two new triterpene bisdesmosides (6,7) were isolated from that of the tubers of E. cilicica. The structure of the isolated compounds were elucidated on the basis of extensive spectroscopic analysis, including that of the high-resolution NMR (^1H-^1H COSY, PHNOESY, HMQC, HMBC, 1D-selective-TOCSY, and HSQC-TCOSY) data, and the results of acidic or enzymatic hydrolysis. To the best our knowledge, 1 is the first representative furostanol glycoside, having a β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl moiety at the C-26 position of the aglycon. The linear hexaglycoside attached at C-28 of the aglycon in 6 and the branched tetraglycoside attached at C-3 of the aglycon in 7 have not been reported as sugars of either triterpene glycosides or steroidal glycosides. It is also notable that 7 has been found to contain D-allopyranose as a sugar component, which is rarely encountered in the plant glycosides.
天然有機化合物討論会の論文
2008-09-01

P-19 Allium karatavienseおよびEranthis cilicicaより単離された新規高極性ステロイドならびにトリテルペン配糖体の化学構造に関する研究(ポスター発表の部)

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