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.
O fracionamento cromatográfico do extrato hexânico dos galhos de Luxemburgia nobilis (Ochnaceae) forneceu β-sitosterol, estigmasterol, ácido betulínico, os ácidos graxos hexadecanóico, tetraeicosanóico, hexaeicosanóico e linoleico, 14-metilpentadecanoato de metila, óxido de 13-epimanoíla, o depsídeo atranorina (1), e dois triglicerídeos novos (2 e 3). As estruturas das substâncias isoladas foram determinadas através da análise dos dados espectroscópicos de I.V., massas e RMN de 1 H e de 13 C incluindo comparação com dados da literatura. A análise do espectro de massas (FAB-MS) dos éteres tiometílicos (4 e 5) foi usada para definir as estruturas dos triglicerídeos.Chromatographic fractionation of the hexane extract from the branches of Luxemburgia nobilis (Ochnaceae) afforded β-sitosterol, stigmasterol, betulinic acid, linoleic acid, methyl-14-methylpentadecanoate, 13-epimanoyl oxide, hexadecanoic acid, tetraeicosanoic acid, hexaeicosanoic acid, the depside atranorin (1) and two new triglycerides (2 and 3). The structures were defined by IR, MS and 1 H-and 13 C-NMR spectral analysis involving comparison with literature data. The FAB-MS spectra analysis of the thiomethyl ethers (4 and 5) were used to define the structures of the triglycerides.
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