title: Cytotoxic and new tetralone derivatives from Berchemia floribunda (Wall.) Brongn.
abstract: Two new alpha-tetralone (=3,4-dihydronaphthalen-1(2H)-one) derivatives, berchemiaside A and B (1 and 2, resp.), and one new flavonoid, quercetin-3-O-(2-acetyl-alpha-L-arabinofuranoside (3), together with ten known flavonoids compounds, eriodictyol (4), aromadendrin (5), trans-dihydroquercetin (6), cis-dihydroquercetin (7), kaempferol (8), kaempferol-3-O-alpha-L-arabinofuranoside (9), quercetin (10), quercetin-3-O-alpha-L-arabinofuranoside or avicularin (11), quercetin 3'-methyl ether, 3-O-alpha-L-arabinofuranoside (12), and maesopsin (13), were isolated from the bark of Berchemia floribunda. Their structures were determined by various NMR techniques and chemical studies. Compounds 3-13 were tested for their cytotoxic activity against human leukemia cells. Among them, kaempferol (8) and maesopsin (13) showed significant inhibitory activities against human leukemia cells CCRF-CEM and its multidrug-resistant sub-line, CEM/ADR5000, with IC(50) values of 14.0, 5.3, 10.2, and 12.3 microM, respectively.
authors.affiliation: State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming 650204, PR China.
authors.forename: Yi-Fen
authors.initials: YF
authors.lastname: Wang
authors.forename: Jian-Xin
authors.initials: JX
authors.lastname: Cao
authors.forename: Thomas
authors.initials: T
authors.lastname: Efferth
authors.forename: Gou-Fang
authors.initials: GF
authors.lastname: Lai
authors.forename: Shi-De
authors.initials: SD
authors.lastname: Luo
mesh_terms: D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D027823:Rhamnaceae / Q000737:chemistry*; D044024:Tetralones / Q000737:chemistry* / Q000633:toxicity*
chemical_list: D044024:Tetralones