Steroidal Saponins from Rhizomes of Tupistra wattii HOOK. f.

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  • Shen Ping
    Department of Natural Products Chemistry, Shenyang Pharmaceutical University
  • Wang San-Long
    Beijing Institute of Biomedicine
  • Liu Xi-Kui
    Kunming Institute of Botany, Chinese Academy of Sciences
  • Yang Chong-Ren
    Kunming Institute of Botany, Chinese Academy of Sciences
  • Cai Bing
    Beijing Institute of Biomedicine
  • Yao Xin-Sheng
    Department of Natural Products Chemistry, Shenyang Pharmaceutical University

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Chemical examination of the fresh rhizomes of Tupistra wattii HOOK. f. led to the isolation of three new steroidal saponins, wattoside G (1), H (2), and I (3), together with one known steroidal saponin, (25S)-1β,3β,4β-trihydroxyspirotan-5β-yl-O-β-D-glucopyranoside (4). The structures of 1—3 were established to be (25R)-1β,2β,3β,5β-tetrahydroxyspirostan-4β-yl-O-β-D-xylopyranoside (1), (24S,25S)-24-[(β-D-glucopyranosyl)oxy]-1β,2β,3β,4β,5β,7β-hexahydroxyspirostan-6-one (2), and (24S,25S)-1β,3β-dihydroxy-5β-spirostan-24-yl-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside (3) on the basis of detailed analyses of physical, chemical, and spectral data. The isolated compounds were evaluated for cytotoxic activity against the cancer cell line K562 in vitro.

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