Resumo

ALVAREZ, Laura; ZAMILPA, Alejandro; MARQUINA, Silvia  e  GONZALEZ, Manasés. Two New Oleanolic Acid Saponins from the Roots of Viguiera hypargyrea. Rev. Soc. Quím. Méx [online]. 2003, vol.47, n.2, pp.173-177. ISSN 0583-7693.

Two new triterpene saponins whose aglycons are based on the oleanane skeleton (1-2), were isolated from the roots of Viguiera hypargyrea, together with two known triterpene saponins (3 and 4) as well as the triterpenes friedelin, friedelan 3β-ol and oleanolic acid. The structures of the new compounds were established mainly by 2D NMR techniques of their peracetylated derivatives as 3-O-[α-L-rhamnopyranosyl (1 → 3)-β-D-xylopyranosyl (1 → 4)]-β-D-glucopyranosyl-oleanolic acid-28-O-β-D-glucopyranoside and 3-O-[α-L-rhamnopyranosyl (1 → 3)-β-D-xylopyranosyl (1 → 4)]-β-D-glucopyranosyl oleanolic acid respectively.

Palavras-chave : Viguiera hypargyrea; Asteraceae; roots; oleanolic acid saponins; bisdesmosides.

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