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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.
Two novel triterpenoid saponins belonging to a modified hopane group, spergulin A {3-O-(β-d-xylopyranosyl 4-sulphate)-spergulagenin A} (1) and spergulin B {3-O-[α-rhamnopyranosyl (1->2)-β-d-xylopyranosyl]-spergulatriol} (4) were isolated from the aerial part of Mollugo spergula along with spergulacin (2) and spergulacin A (3). Their structures and relative stereochemistry were determined by a combination...
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