title: D:A friedo-oleanane lactones from the stems of Mallotus repandus.
abstract: Three new D:A-friedo-oleanane lactones, viz., 3-oxo-D:A-friedo-oleanan-27,16alpha-lactone (1), 3alpha-benzoyloxy-D:A-friedo-oleanan-27,16alpha-lactone (2), and 3beta-hydroxy-D:A-friedo-oleanan-27,16alpha-lactone (3) were isolated from the stems of Mallotus repandus. Extensive use of NMR spectroscopic techniques led to full assignment of all 1H and 13C chemical shifts. The structure for 2 was confirmed by X-ray diffraction analysis.
authors.affiliation: Department of Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok 10240, Thailand, Chulabhorn Research Institute, Bangkok 10210, Thailand. somyote@ram1.ru.ac.th
authors.forename: S
authors.initials: S
authors.lastname: Sutthivaiyakit
authors.forename: J
authors.initials: J
authors.lastname: Thongtan
authors.forename: S
authors.initials: S
authors.lastname: Pisutjaroenpong
authors.forename: K
authors.initials: K
authors.lastname: Jiaranantanont
authors.forename: P
authors.initials: P
authors.lastname: Kongsaeree
mesh_terms: D002855:Chromatography, Thin Layer; D018360:Crystallography, X-Ray; D019665:Euphorbiaceae / Q000737:chemistry*; D007783:Lactones / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008968:Molecular Conformation; D009828:Oleanolic Acid / Q000031:analogs & derivatives / Q000737:chemistry / Q000302:isolation & purification*; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013785:Thailand
chemical_list: C433893:3-benzoyloxy-A-friedo-oleanan-27,16-lactone; C433894:3-hydroxy-A-friedo-oleanan-27,16-lactone; C433895:3-oxo-A-friedo-oleanan-27,16-lactone; D007783:Lactones; D009828:Oleanolic Acid