Triterpene glycosides fromTupidanthus calyptratus I. Structure of glycosides B1, B2, F1, and F2 from leaves of hooded tupidanthus

Abstract

Chromatographically inseparable mixtures of oleanolic and ursolic 3-O-α-L-rhamnopyranosyl-(1→2)-O-α-L-arabinopyranosides (glycosides B1 and B2) and their 28-O-α-L-rhamnopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl esters (glycosides F1 and F2) are isolated from the leaves ofTupidanthus calyptratus Hook f. (Araliaceae). The structures of the isolated glycosides are established from chemical methods and1H and13C NMR spectra. Glycoside F2 is a new triterpene glycoside.