| Popis: |
Two new oleanane-type triterpene saponins, afrocyclamins A and B (1 and 2, resp.), were isolated from a MeOH extract of the roots of Cyclamen africanum Boiss. & Reuter, together with three known triterpenoid saponins, lysikokianoside, deglucocyclamin I, and its dicrotalic acid derivative. The structures were elucidated, on the basis of 1D- and 2D-NMR experiments and mass spectrometry as (3β,20β)-13,28-epoxy-16-oxo-3-{O-β-D-xylopyranosyl-(12)-O-β-D-glucopyranosyl-(14)-O-[β-D-glucopyranosyl-(12)]-α-L-arabinopyranosyl}oxy}oleanan-29-al (1) and (3β,16α,20β)-16,28,29-trihydroxy-olean-12-en-3-yl O-4-O-(4-carboxy-3-hydroxy-3-methyl-1-oxobutyl)-β-D-xylopyranosyl-(12)-O-β-D-glucopyranosyl-(14)-O-[β-D-glucopyranosyl-(12)]-α-L-arabinopyranoside (2). |
