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  • Title: Four acylated triterpenoid saponins from Albizia procera.
    Author: Yoshikawa K, Satou Y, Tokunaga Y, Tanaka M, Arihara S, Nigam SK.
    Journal: J Nat Prod; 1998 Apr; 61(4):440-5. PubMed ID: 9584398.
    Abstract:
    Four new oleanane-type triterpene glycosides, proceraosides A-D (1-4), were isolated from the seeds of Albizia procera. Their structures were established by extensive NMR experiments and chemical methods. Compounds 1-3 comprised acacic acid as the aglycon and a monoterpenic carboxylic acid linked to a monoterpene quinovoside as the acyl moiety at C-21. The common oligosaccharide moiety linked to C-28 in 1-3 was determined as alpha-l-arabino- furanosyl-(1-->4)-[beta-D-glucopyranosyl-(1-->3)]-alpha-L-rhamnopyranosy l- (1-->2)-beta-D-glucopyranosyl ester. These compounds differed in the C-3-linked sugar unit or in the configuration of C-6' of the inner monoterpene moiety in the C-21-linked acyl unit. Compound 4 was established as the 16-deoxy analogue of 1.
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