title: Homoisoflavanones from Disporopsis aspera.
abstract: From cytotoxic extracts of the roots of Disporopsis aspera Engl. (Liliaceae) a homoisoflavanone, disporopsin (3-(2',4'-dihydroxy-benzyl)-5,7-dihydroxy-chroman-4-one) (1) and three rare methyl-homoisoflavanones, 3-(4'-hydroxy-benzyl)-5,7-dihydroxy-6-methyl-chroman-4-one (2), 3-(4'-hydroxy-benzyl)-5,7-dihydroxy-6,8-dimethyl-chroman-4-one (3) and 3-(4'-hydroxy-benzyl)-5,7-dihydroxy-6-methyl-8-methoxy-chroman-4- one (4) along with five other known compounds, N-trans-feruloyl tyramine (5), adenine (6), 5-(hydroxymethyl)-2-furfural (7), beta-sitosterol (8) and beta-sitosteryl glucopyranoside (9) were isolated. The structures of compounds 1-2 were elucidated by spectral data (1, 2-D NMR and EIMS). The four homoisoflavanones (1-4) were found to be cytotoxic against a series of human cancer cell lines (HCT15, T24S, MCF7, Bowes, A549 and K562) with IC(50) ranging from 15 to 200 microM. Possible biosynthesis routes for homoisoflavonoids (1-4) are discussed.
authors.affiliation: Laboratory of Pharmacognosy, Bromatology and Human Nutrition, Institute of Pharmacy CP 205-9, Université Libre de Bruxelles, B-1050 Brussels, Belgium. annhth@ulb.ac.be <annhth@ulb.ac.be>
authors.forename: Anh-Tho
authors.initials: AT
authors.lastname: Nguyen
authors.forename: Jeanine
authors.initials: J
authors.lastname: Fontaine
authors.forename: Hugues
authors.initials: H
authors.lastname: Malonne
authors.forename: Pierre
authors.initials: P
authors.lastname: Duez
mesh_terms: D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D002867:Chromones / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D006801:Humans; D020128:Inhibitory Concentration 50; D007529:Isoflavones / Q000737:chemistry* / Q000302:isolation & purification / Q000494:pharmacology; D020014:K562 Cells; D019668:Liliaceae / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D015394:Molecular Structure; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods
chemical_list: C516031:(3-(2',4'-dihydroxy-benzyl)-5,7-dihydroxy-chroman-4-one); D002867:Chromones; D007529:Isoflavones