title: Saponins from Pisonia umbellifera.
abstract: Six saponins were isolated from the leaves of Pisonia umbellifera. Three are new oleanolic acid saponins, and two of them contain an unusual seco-glycopyranosyl moiety. Their structures were determined using a combination of 1H and 13C NMR, and mass spectrometry as 3-O-{beta-D-glucopyranosyl(1-->2)[beta-D-glucopyranosyl (1-->2)-beta-D-xylopyranosyl(1-->3)]-beta-D-glucuronopyranosyl} 28-O-beta-D-glucopyranosyl olean-12-en-3 beta-ol-28-oic acid, 3-O-{2'-(2"-O-glycolyl)-glyoxylyl-beta-D-glucuronopyranos yl} 28-O-beta-D-glucopyranosyl olean-12-en-3 beta-ol-28-oic acid and 3-O-{2'-O-glycolyl)-glyoxylyl-beta-D-glucuronopyranosyl++ +} olean-12-en-3 beta-ol-28-oic acid.
authors.affiliation: Laboratoire de Pharmacognosie, associé au CNRS-URA 492, UFR de Pharmacie, Reims, France.
authors.forename: C
authors.initials: C
authors.lastname: Lavaud
authors.forename: S
authors.initials: S
authors.lastname: Beauvière
authors.forename: G
authors.initials: G
authors.lastname: Masşiot
authors.forename: L
authors.initials: L
authors.lastname: Le Men-Olivier
authors.forename: G
authors.initials: G
authors.lastname: Bourdy
mesh_terms: D002236:Carbohydrate Conformation; D009682:Magnetic Resonance Spectroscopy; D012503:Saponins / Q000737:chemistry / Q000302:isolation & purification*; D016339:Spectrometry, Mass, Fast Atom Bombardment; D014197:Trees / Q000737:chemistry*
chemical_list: D012503:Saponins