Triterpenoids saponins and sapogenin lactones from Albizia gummifera
2000
The structures of two new monodesmosidic and bisdesmosidic triterpenoid saponins (1 and 2) and the known compound delta5-stigmasterol-3-O-beta-D-glucopyranoside (3) as well as two new oleanane type triterpene lactone glycosides 4, 5 and a new sapogenin lactone 6 isolated from the stem bark of Albizia gummifera C.A. Smith (Mimosaceae) have been elucidated as 3-O-{beta-D-glucopyranosyl(1 leads to 2)-[alpha-L-arabinopyranosyl(1 leads to 6)]-beta-D-glucopyranosyl}-oleanolic acid (1), beta-D-glucopyranosyl(1 leads to 2)-beta-D-glucopyranosyl 3-O-[beta-D-glucopyranosyl(1 leads to 2)-[alpha-L-arabinopyranosyl(1 leads to 6)]-beta-D-glucopyranosyl]-oleanolate (2), 3beta-[O-D-glucopyranosyl-(1 leads to 2)-[O-alpha-L-arabinopyranosyl(1 leads to 6)]beta-D-glucopyranosyloxy]-machaerinic acid gamma-lactone (4), 3beta-O-beta-D-glucopyranosiduronic acid (1 leads to 2)-beta-D-glucopyranosyloxy]-machaerinic acid gamma-lactone (5), and A-homo-3a-oxa-5beta-olean-12-en-3-one-28-oic acid (6), respectively. The complete assignment of the 1H and 13C resonances of 1, 2, 4 and 6 and of the peracetate of 5 were achieved by means of 2D-NMR studies.
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