New Biflavonoid and Other Constituents from Luxemburgia nobilis (EICHL)

• Autor(a) principal: Oliveira,Márcia C. C. de
• Data de Publicação: 2002
• Outros Autores: Carvalho,Mário G. de, Silva,Cleber J. da, Werle,Alceni A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Journal of the Brazilian Chemical Society (Online)
• Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000100020
• topic: Luxemburgia nobilis; Ochnaceae; flavonoids; steroids; triterpenes

Chromatographic fractionation of the organic extracts from the leaves and branches of Luxemburgia nobilis (Ochnaceae) afforded sitosterol, sitosterol-3-O-betaD-glucopyranoside, friedelin, friedelinol, a mixture of triterpenes lupeol, alpha-amyrin and beta-amyrin, rutin, epicatechin, a mixture of two chalcones, 2,4,3',4'-tetrahydroxychalcone and 2,4,4'-trihydroxychalcone, two known biflavones, amentoflavone and robustaflavone along with a new biflavonoid, 5,7,4'-trihydroxyflavone-(3'-O-4'")-5",7"-dihydroxyflavanone. The structures were established from spectral data, including 2D-NMR experiments of the natural substances and of the acetyl and methyl ether derivatives of the new biflavone.