title: Four new isoflavonoids from the stem bark of Erythrina variegata.
abstract: Bioassay-directed fractionation of the stem bark extract of Erythrina variegata L. has resulted in the isolation of three new isoflavones: 5,4'-dihydroxy-8-(3,3-dimethylallyl)-2''-methoxyisopropylfurano[4,5:6,7]isoflavone (1), 5,7,4'-trihydroxy-6-(3,3-dimethylallyloxiranylmethyl)isoflavone (2), 5,4'-dihydroxy-8-(3,3-dimethylallyl)-2''-hydroxymethyl-2''-methylpyrano[5,6:6,7]isoflavone (3) and a new isoflavanone, 5,4'-dihydroxy-2'-methoxy-8-(3,3-dimethylallyl)-2'',2''-dimethylpyrano[5,6:6,7]isoflavanone (4) together with seven known compounds, euchrenone b10 (5), isoerysenegalensein E (6), wighteone (7), laburnetin (8), lupiwighteone (9), erythrodiol (10), and oleanolic acid (11). The structures were determined on the basis of spectroscopic analyses and chemical evidence. The effect of these compounds on the proliferation of rat osteogenic sarcoma (UMR106) is also reported.
authors.affiliation: Department of Natural Products Chemistry, Shenyang Pharmaceutical University, China.
authors.forename: Li
authors.initials: L
authors.lastname: Xiaoli
authors.forename: Wang
authors.initials: W
authors.lastname: Naili
authors.forename: Wong Man
authors.initials: WM
authors.lastname: Sau
authors.forename: Albert S C
authors.initials: AS
authors.lastname: Chen
authors.forename: Yao
authors.initials: Y
authors.lastname: Xinsheng
mesh_terms: D000818:Animals; D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D049109:Cell Proliferation / Q000187:drug effects*; D004895:Erythrina / Q000737:chemistry*; D007529:Isoflavones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D015394:Molecular Structure; D012516:Osteosarcoma / Q000473:pathology; D024301:Plant Bark / Q000737:chemistry*; D010946:Plants, Medicinal; D051381:Rats; D014407:Tumor Cells, Cultured
chemical_list: D000900:Anti-Bacterial Agents; D000972:Antineoplastic Agents, Phytogenic; D007529:Isoflavones