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BIBTEX RIS

Two 8C-methylated Flavonols from the Leaves of Vellozia candida Mikan (Velloziaceae)

2002; Brazilian Chemical Society; Volume: 13; Issue: 3 Linguagem: Inglês

10.1590/s0103-50532002000300005

ISSN

1678-4790

Autores

Alexsandro Branco, Ângelo C. Pinto, Demian R. Ifa, Raimundo Braz‐Filho,

Tópico(s)

Natural product bioactivities and synthesis

Resumo

From the leaves of Vellozia candida Mikan (Velloziaceae) the new flavonol 3',4',5,7-tetrahydroxy-3,6-dimethoxy-8-methylflavone and its known 7-O-methyl derivative, 3',4',5-trihydroxy-3,6,7-trimethoxy-8-methylflavone, were isolated and characterized by spectral data, including 2D NMR and tandem mass spectrometry experiments. The 5-hydroxy-3,3',4',6,7-pentamethoxy-8-methylflavone derivative was obtained by methylation with diazomethane.

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