思茅藤的化学成分研究

STUDY ON CONSTITUENTS FROM EPIGYNUM AURITUM

从思茅藤(Epigynum auritum (schneid.)Tsiang et P.T.Li)的茎皮中分离到一个新的化合物,命名为思茅藤甙(Epigcoside)Ⅰ和已知化合物Ⅱ。通过光谱分析和化学反应证明,其结构为Ⅰ(+)—儿茶素-3-O-α-D-葡萄吡喃糖(1→6)-β-D葡萄吡喃糖甙((+)-catchin—3-O-α-D-glucopyranosyl-(1→6)-β—D-glucopyranoside;Ⅱβ-谷甾醇β-D-葡萄糖甙(β-sitosterol-β-D-glucoside)。

A new glycoside, Epigeoside, and known compound β-sitosterol-β-D-glucopyranoside were isolated from the rhizomes of Epigynum auritum (Schncid.) Tsiang et p. T. Li(Apocynaceae). The structure of Epigeoside has been deduced on the basis of spectral analysis and chemical reactions as (+) -catchin-3-0-α-D-glucopyranosyl- (1→6) -β-D-lucopyranosidc. Acid hydrolysis of Epigeoside with 2N H_2SO_4 to afford an aglycone, which was identified by comparison with (+) -eatchin and glucose as a sugar, which was identified by gas-liquid chromatograph(GLC) comparing with authentic sample of gluvose-TMS derivative.