title: Resveratrol derivatives from Vatica albiramis.
abstract: Three new stilbene derivatives, albiraminols A (1) (resveratrol hexamer), B (2) (resveratrol dimer), and vatalbinoside F (3) (mono-glucoside of resveratrol dimer), along with malibatol were isolated from acetone soluble portions of the stem of Vatica albiramis. The structures of the isolates were established on the basis of spectroscopic analyses, including a detailed NMR spectroscopic investigation. The biosynthetic aspects of the isolates are discussed in this paper. Compound 1 is composed of tetrameric resveratrol (vaticanol B (1A)) and dimeric resveratrol (1B) and is the first instance of the resveratrol derivative bearing a 5,6,11,12-tetrahydro-5,11-epoxydibenzo[a,e][8]annulene ring system. Compound 2 possesses a novel 4,5-dihydro-13-oxabenzo[3,4]azuleno[7,8,1-jkl]phenanthrene skeleton in the framework.
authors.affiliation: Laboratory of Pharmacognosy, Gifu Pharmaceutical University, 1–25–4 Daigaku-nishi, Gifu, Japan.
authors.forename: Naohito
authors.initials: N
authors.lastname: Abe
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Ito
authors.forename: Masayoshi
authors.initials: M
authors.lastname: Oyama
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Sawa
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Takahashi
authors.forename: Munekazu
authors.initials: M
authors.lastname: Iinuma
mesh_terms: D053958:Dipterocarpaceae / Q000737:chemistry*; D006576:Heterocyclic Compounds, 4 or More Rings / Q000737:chemistry* / Q000302:isolation & purification; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D018547:Plant Stems / Q000737:chemistry; D000077185:Resveratrol; D013267:Stilbenes / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D006576:Heterocyclic Compounds, 4 or More Rings; D013267:Stilbenes; C559412:albiraminol A; C559411:vatalbinoside F; D000077185:Resveratrol