title: Biflavonoids and a glucopyranoside derivative from Ouratea semiserrata.
abstract: Two new biflavonoids, 5-hydroxy-7-methoxyflavone-(4' --> O --> 8")-4"',5",7"-trihydroxyflavone and 5-hydroxy-7-methoxyflavone-(4' --> O --> 8")-5",7"-dihydroxy-4"'-methoxyflavone, and the glucopyranoside derivative, 1-O-(4-hydroxyphenyl)-6-O-(4-hydroxybenzoyl)-beta-D-glucopyranoside, as well as the known biflavones lanaraflavone, amentoflavone and podocarpusflavone, the triterpenes lupeol and friedelin, the lignans eudesmin and epieudesmin, the flavonol glycoside rutin, the steroids beta-sitosterol, stigmasterol, 3beta-O-beta-D-glucopyranosylsitosterol, 7-oxostigmast-5-en-3beta-ol and 7-oxostigmasta-5,22-dien-3beta-ol, the carbohydrates alpha- and beta-glucopyranose and 1-O-(4-hydroxybenzoyl)-beta-D-glucopyranoside, and the norsesquiterpene 6,9-dihydroxymegastigma-4,7-dien-3-one, have been isolated from leaves and branches of Ouratea semiserrata. The structures of these compounds were established from spectral data, including two-dimensional NMR experiments and mass spectra.
authors.affiliation: Curso de Pós-graduação em Química Orgânica, Universidade Federal Rural do Rio de Janeiro, 23851-970 Seropédica-Rio de Janeiro, Brazil.
authors.forename: Javier Rincon
authors.initials: JR
authors.lastname: Velandia
authors.forename: Mário Geraldo
authors.initials: MG
authors.lastname: de Carvalho
authors.forename: Raimundo
authors.initials: R
authors.lastname: Braz-Filho
authors.forename: Alceni A
authors.initials: AA
authors.lastname: Werle
mesh_terms: D005419:Flavonoids / Q000737:chemistry* / Q000302:isolation & purification*; D005960:Glucosides / Q000737:chemistry* / Q000302:isolation & purification*; D017705:Lignans / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D019684:Magnoliopsida / Q000737:chemistry*; D013058:Mass Spectrometry; D015394:Molecular Structure; D009005:Monosaccharides / Q000737:chemistry / Q000302:isolation & purification; D018515:Plant Leaves / Q000737:chemistry; D014315:Triterpenes / Q000737:chemistry
chemical_list: C477628:1-O-(4-hydroxyphenyl)-6-O-(4-hydroxybenzoyl)-beta-D-glucopyranoside; C477630:5-hydroxy-7-methoxyflavone-(4' -O-8'')-4''',5'',7''-trihydroxyflavone; C477629:5-hydroxy-7-methoxyflavone-(4' -O-8'')-5'',7''-dihydroxy-4'''-methoxyflavone; D005419:Flavonoids; D005960:Glucosides; D017705:Lignans; D009005:Monosaccharides; D014315:Triterpenes