title: Methyl migrated cassane-type furanoditerpenes of Caesalpinia crista from Myanmar.
abstract: From the CH2Cl2 extract of seed kernels of Caesalpinia crista from Myanmar, two rare and biogenetically interesting methyl migrated cassane-type furanoditerpenes [caesalpinins MM (1) and MN (2)] and two normal cassane-type furanoditerpenes [caesalpinins MO (3) and MP (4)] have been isolated, together with eight known cassane-type diterpenes, 1-deacetoxy-1-oxocaesalmin C (5), 1-deacetylcaesalmin C (6), caesalmin C (7), bonducellpin C (8), caesaldekarin e (9), 2-acetoxycaesaldekarin e (10), 2-acetoxy-3-deacetoxycaesaldekarin e (11), and norcaesalpinin E (12). Among the known compounds, compounds 5 and 6 were for the first time isolated from a natural source. The structures of these compounds were elucidated by the use of spectroscopic techniques.
authors.affiliation: Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Toyama, Japan.
authors.forename: Surya Kant
authors.initials: SK
authors.lastname: Kalauni
authors.forename: Suresh
authors.initials: S
authors.lastname: Awale
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Tezuka
authors.forename: Arjun Hari
authors.initials: AH
authors.lastname: Banskota
authors.forename: Thein Zaw
authors.initials: TZ
authors.lastname: Linn
authors.forename: Shigetoshi
authors.initials: S
authors.lastname: Kadota
mesh_terms: D029911:Caesalpinia / Q000737:chemistry*; D002247:Carbon Isotopes; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008968:Molecular Conformation; D002052:Myanmar; D011522:Protons; D012015:Reference Standards; D012639:Seeds / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D002247:Carbon Isotopes; D004224:Diterpenes; D011522:Protons