title: Homoisoflavanones from Ledebouria floribunda.
abstract: The bulbs of Ledebouria floribunda (Baker) Jessop have yielded two novel compounds, 7-O-[alpha-rhamnopyranosyl-(1-->6)-beta-glucopiranosyl]-5-hydroxy-3-(4-methoxybenzyl)-chroman-4-one (1) and 7-O-[alpha-rhamnopyranosyl-(1-->6)-beta-glucopiranosyl]-5-hydroxy-3-(4'-hydroxybenzyl)-chroman-4-one (2) along with five other known compounds, 5,7-dihydroxy-3-(4'-methoxybenzyl)-chroman-4-one or 3,9-dihidroeucomin (3), 5,7-dihidroxy-6-methoxy-3-(4'-methoxybenzyl)-chroman-4-one (4), 5,7-dihidroxy 3-(4'-hydroxybenzyl)-chroman-4-one or 4,4'-demethyl-3,9-dihydropuctatin (5), 5,7-dihidroxy-3-(4'-hydroxybenzyl)-6-methoxy-chroman-4-one or 3,9-dihydroeucomnalin (6) and 7-hydroxy-3-(4'-hydroxybenzyl)-5-methoxy-chroman-4-one (7). Their structures were elucidated by spectra analysis. The seven homoisoflavanones were found to be antioxidant against DPPH radical and beta-carotene/linoleic acid system.
authors.affiliation: Dipartamento Farmacia y Tecnología Farmacéutica (Facultad de Farmacia), University of Navarra, 31008 Pamplona, Spain. mcalvo@unav.es
authors.forename: María Isabel
authors.initials: MI
authors.lastname: Calvo
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D007529:Isoflavones / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology*; D019668:Liliaceae / Q000737:chemistry*; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D018517:Plant Roots
chemical_list: C540037:7-O-(alpha-rhamnopyranosyl-(1-6)-beta-glucopiranosyl)-5-hydroxy-3-(4-hydroxybenzyl)-chroman-4-one; C540036:7-O-(alpha-rhamnopyranosyl-(1-6)-beta-glucopiranosyl)-5-hydroxy-3-(4-methoxybenzyl)-chroman-4-one; D000975:Antioxidants; D007529:Isoflavones; D010936:Plant Extracts; C065753:isoflavanone