title: Petersaponins III and IV, triterpenoid saponins from Petersianthus macrocarpus.
abstract: Two new triterpenoid saponins, petersaponins III and IV (1 and 2), were isolated from an n-butanol extract of the bark of Petersianthus macrocarpus. They possess 21-O-benzoyl-22-O-acetylbarringtogenol C and 21-O-2-furoxyl-22-O-tigloylbarringtogenol C as the aglycon, respectively. For both 1 and 2, the trisaccharide moiety linked to C-3 of the aglycon consists of D-glucuronic acid, D-xylose, and D-galactose, while a L-rhamnose unit is linked to C-28. The structures of 1 and 2 were elucidated by extensive NMR experiments including (1)H-(1)H (COSY, HOHAHA, NOESY) and (1)H-(13)C (HMQC and HMBC) spectroscopy and by chemical evidence.
authors.affiliation: Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France.
authors.forename: T A
authors.initials: TA
authors.lastname: Olugbade
authors.forename: A
authors.initials: A
authors.lastname: Ogundaini
authors.forename: N
authors.initials: N
authors.lastname: Birlirakis
authors.forename: M
authors.initials: M
authors.lastname: Païs
authors.forename: M T
authors.initials: MT
authors.lastname: Martin
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006868:Hydrolysis; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D009904:Optical Rotation; D019441:Plant Epidermis / Q000737:chemistry; D010936:Plant Extracts / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry* / Q000302:isolation & purification; D014315:Triterpenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D010936:Plant Extracts; D012503:Saponins; D014315:Triterpenes; C411305:petersaponin III; C411306:petersaponin IV