Three new saponins from the leaves of Ilex hylonoma.
Ključne besede
Povzetek
Three new triterpenoid saponins, hylonosides III-V (1-3) have been isolated, along with three known oleanolic acid saponins (4-6), from the methanol extract of leaves of Ilex hylonoma. The structures were elucidated using a combination of homo- and hetero-nuclear 2D NMR techniques (COSY, TOCSY, NOESY, HMQC and HMBC) and negative FAB-MS. The new compounds were characterized as 3-O-beta-D-glucopyranosyl-(1 --> 4)-beta-D-glucuronopyranosyl siaresinolic acid-28-O-beta-D-glucopyranosyl ester (1), 3-O-beta-D-glucopyranosyl-(1 --> 4)-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucuronopyranosyl siaresinolic acid-28-O-beta-D-glucopyranosyl ester (2), 3-O-beta-D-glucopyranosyl-(1 --> 4)-beta-D-glucopyranosyl-(1 --> 2)-beta-D-glucuronopyranosyl oleanolic acid-28-O-beta-D-glucopyranosyl ester (3).
