title: Two oleanane triterpenoids from gordonia ceylanica and their conversions to taraxarane triterpenoids.
abstract: Chemical investigation of the hot hexane extract of the stem bark of Gordonia ceylanica afforded two new oleanane triterpenoids, 3beta-acetoxy-11alpha, 13beta-dihydroxyolean-12-one and 3beta,11alpha-diacetoxy-13beta-hydroxyolean-12-one (2) The attempted acid hydrolysis of these two compounds resulted the dehydration and subsequent methyl group migration to afford the taraxarane triterpenoids 3beta,11alpha-dihydroxytaraxer-14-en-12-one (4) and 3beta-hydroxy-11alpha-acetoxytaraxer-14-en-12-one (5), respectively. These taraxaranes have not been previously reported.
authors.affiliation: Natural Products Programme, Institute of Fundamental Studies, Kandy, Sri Lanka. herath@ifs.ac.lk
authors.forename: H M
authors.initials: HM
authors.lastname: Herat
authors.forename: P S
authors.initials: PS
authors.lastname: Athukoralage
authors.forename: J F
authors.initials: JF
authors.lastname: Jamie
mesh_terms: D020448:Ericales / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D015394:Molecular Structure; D018547:Plant Stems / Q000737:chemistry*; D014315:Triterpenes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: C419066:3,11-diacetoxy-13-hydroxyolean-12-one; C419067:3-acetoxy-11,13-dihydroxyolean-12-one; D014315:Triterpenes