An unusual C-6-C-6 '' linked flavonoid from Miconia cabucu (Melastomataceae)
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Data
2007-07-01
Autores
Rodrigues, Juliana
Rinaldo, Daniel
dos Santos, Lourdes Campaner
Vilegas, Wagner [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Elsevier B.V.
Resumo
Chromatographic fractionation of the methanolic extract from the leaves of Miconia cabucu Hoehne (Melastomataceae) afforded the first example of a C-6-C-6 linked flavone dimer, 5-hydroxy-4',7-dimethoxyflavone-(6-C-6)-5-hydroxy-3 4',7-trimethoxyflavone as well as the known compounds, quercetin- 3-O-alpha-L- rhamnopyranosyl-(2 -> 1)-O-beta-D-xylopyranoside, quercetin-3-O-alpha-L-rhamnopyranoside, myricetin-3-O-alpha-L-rhamnopyranoside, quercetin-3-O-beta-D-glucopyranoside, kaempferol -3-O-beta-D-(6-coumaroyl) -glucopyranoside and gallic acid. Their chemical identities were established by application of NMR spectroscopic methods including 2D-NMR, as well as UV and ESI-MS analyses. (c) 2007 Elsevier Ltd. All rights reserved.
Descrição
Palavras-chave
Miconia cabucu, Melastomataceae, flavonoids, flavone dimer
Como citar
Phytochemistry. Oxford: Pergamon-Elsevier B.V., v. 68, n. 13, p. 1781-1784, 2007.