Four New Steroid Constituents from the Waste Residue of Fibre Separation from Agave americana Leaves

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  • Jin Jian-Ming
    State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences
  • Zhang Ying-Jun
    State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences
  • Yang Chong-Ren
    State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences

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Three new steroidal saponins, named agamenosides H—J (1—3), and a new cholestane steroid agavegenin D (4) were isolated from the waste residue of fibre separation from Agave americana leaves, together with six known steroids. Structures of the new compounds 1—4 were deduced to be (22S,23S,24R,25S)-24-[(β-D-glucopyranosyl)oxy]-5α-spirostane-3β,6α,23-triol 6-O-β-D-glucopyranoside (1), (22S,23S,24R,25S)-5α-spirostane-3β,23,24-triol 24-O-β-D-glucopyranoside (2), (22S,23S,25R,26S)-23,26-epoxy-5α-furostane-3β,22,26-triol 26-O-β-D-glucopyranoside (3), and (22S,25S)-5α-cholestane-3β,16β,22,26-tetrol (4), respectively, by means of spectroscopic analysis, including extensive 1D and 2D NMR data, and the results of hydrolytic cleavage.

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