Isolation and NMR Assignment of a Pennogenin Glycoside from Dioscorea bulbifera L. var sativa

  • Teponno, Remy Bertrand (Department of Chemistry, Faculty of Science, University of Dschang) ;
  • Tapondjou, Azefack Leon (Department of Chemistry, Faculty of Science, University of Dschang) ;
  • Djoukeng, Jules Desire (Department of Chemistry, Faculty of Science, University of Dschang,Institute of Chemistry, University of Neuchatel) ;
  • Abou-Mansour, Eliane (Institute of Chemistry, University of Neuchatel) ;
  • Tabacci, Raphael (Institute of Chemistry, University of Neuchatel) ;
  • Tane, Pierre (Department of Chemistry, Faculty of Science, University of Dschang) ;
  • Lontsi, David (Department of Organic Chemistry, Faculty of Science, University of Yaounde) ;
  • Park, Hee-Juhn (Department of Botanical Resources, Sangji University)
  • Published : 2006.03.01

Abstract

A steroidal saponin, $3-O-{\alpha}-L-rhamnopyranosyl-(1{\rightarrow}2)-[{\alpha}-L-rhamnopyranosyl-(1{\rightarrow}3)]-{\beta}-D-glucopyranosylpennogenin$ ;(1, spiroconazole A) was isolated from the tubers of Dioscorea bulbifera L. var sativa and $^1H-and\;^{13}C-NMR$ assignment was completed using HMBC correlation. In addition, four phenolic substances, 2,7-dihydroxy-4-methoxyphenanthrene (2), quercetin (3), $quercetin-3-O-{\beta}-D-glucopyranoside$ (4), and $quercetin-3-O-{\beta}-D-galactopyranoside$ (5) were also isolated.

Keywords

References

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