title: Tricalysiosides P-U: Ent-kaurane glucosides and a labdane glucoside from leaves of Tricalysia dubia OHWI.
abstract: Further extensive isolation work on the 1-BuOH-soluble fraction of a MeOH extract of Tricalysia dubia afforded five new ent-kaurane glucosides (4-8) and one new labdane glucoside (9), together with a known megastigmane glucoside, sammangaoside B (1), and monoterpene glucosides (2, 3). The structures of the new compounds were elucidated by analyses of one- and two-dimensional NMR spectroscopic data. The absolute configuration of the 9-position of sammangaoside B was revised to S and its total stereochemistry was established by the modified Mosher's method.
authors.affiliation: Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima 734-8553, Japan. hotsuka@hiroshima-u.ac.jp
authors.forename: Hideaki
authors.initials: H
authors.lastname: Otsuka
authors.forename: Junko
authors.initials: J
authors.lastname: Shitamoto
authors.forename: Dong-Hui
authors.initials: DH
authors.lastname: He
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Matsunami
authors.forename: Takakazu
authors.initials: T
authors.lastname: Shinzato
authors.forename: Mitsunori
authors.initials: M
authors.lastname: Aramoto
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Takeda
authors.forename: Tripetch
authors.initials: T
authors.lastname: Kanchanapoom
mesh_terms: D000440:Butanols / Q000737:chemistry; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D045786:Diterpenes, Kaurane / Q000737:chemistry* / Q000302:isolation & purification; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D019666:Rubiaceae / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D000440:Butanols; D004224:Diterpenes; D045786:Diterpenes, Kaurane; D005960:Glucosides; D000432:Methanol