title: Four acylated triterpenoid saponins from Albizia procera.
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.
authors.affiliation: Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Yoshikawa
authors.forename: Y
authors.initials: Y
authors.lastname: Satou
authors.forename: Y
authors.initials: Y
authors.lastname: Tokunaga
authors.forename: M
authors.initials: M
authors.lastname: Tanaka
authors.forename: S
authors.initials: S
authors.lastname: Arihara
authors.forename: S K
authors.initials: SK
authors.lastname: Nigam
mesh_terms: D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000302:isolation & purification* / Q000494:pharmacology; D012639:Seeds / Q000737:chemistry; D016339:Spectrometry, Mass, Fast Atom Bombardment; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D014315:Triterpenes / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D012503:Saponins; D014315:Triterpenes