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Three new polyhydroxy pregnanes named dregealol (1), volubilogenone (2) and volubilol (3) were isolated from the flowers of Dregea volubilis, and their structures elucidated from extensive 2D NMR analysis. The structure of volubilol (3) was confirmed by X-ray crystallographic studies. The known pregnane derivatives drevogenin D, iso-drevogenin P and 17α-marsdenin were also isolated.
Three novel polyoxypregnane glycosides, volubiloside A, B and C (1-3), were isolated from the flowers of Dregea volubilis Linn., and their structures were elucidated as drevogenin d-3-O-β-d-glucopyranosyl (1->4)-6-deoxy-3-O-methyl-β-d-allopyranosyl (1->4)-β-d-cymaropyranosyl (1->4)-β-d-cymaropyranoside, drevogenin d-3-O-β-d-glucopyranosyl (1->4)-6-deoxy-3-O-methyl-β-d-allopyranosyl (1->4)-β-d-cymaropyranosyl...
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