Triterpenoid saponins from the stem bark of Elattostachys apetala

Six new triterpenoid saponins have been isolated from the stem balk of Elattostachys apetala together with four known triterpenoid saponins. Three of these new compounds are glycosides of a newly described genin, 29-hydroxyhederagenin (1). On the basis of spectral evidence, the structures of the new saponins were concluded to be alpha -hederin 28-O-[alpha -L-rhamnopyranosyl-( 1 --> 2)-beta -D-glucopyranosyl] ester (2), sapindoside B 28-O-[alpha -L-rhamnopyranosyl-( 1 -->2)-beta -D-glucopyranosyl] ester (3), 3-O-beta -D-xylopqranosyl astrantiasaponin VII (4), 3-O-[alpha -L-rhamnopyranosyl-(1 --> 2)-alpha -L-arabinopyranosyl]-28-O-[beta -D-glucopyranosyl- (1 --> 2)-(beta -D-glucopyranosyl-(1 --> )}-beta -D-glucopyranosyl]-29-hydroxyhederagenin (5), 3-O-[alpha -L-arabinupyranosyl-(1 --> 3)- alpha -L-rhamnopyranosyl-(1 --> 2)-alpha- L-arabinopyranosyl]-28-O-[beta -D-glucopyranosyl (1 --> 2) and 3-O-[beta -D-xylopyranosyl-(1 -->3)-alpha -L-rhamnopymnosyl-(1 --> 2)-alpha -L-arabinopyrunospl]-28-O-[beta -D-glucopyranosyl-(1 --> 2)-beta -D-gluco pyranosyl-( 1 --> 6)-beta -D-glucopyranosyl]-29-hydroxyhe (7). (C) 2001 Elsevier Science Ltd. All rights reserved.