Biflavones from the leaves of Araucaria excelsa
1978; Elsevier BV; Volume: 17; Issue: 5 Linguagem: Inglês
10.1016/s0031-9422(00)88662-8
ISSN1873-3700
AutoresNajma Ilyas, Muhana Fawwazy Ilyas, W. Rahman, M. Okigawa, N. Kawano,
Tópico(s)Bioactive natural compounds
ResumoEight biflavones have been isolated from the leaf extracts of Araucaria excelsa. 7″-O-Methylamento-flavone, 7,7″-di-O-methylamentoflavone, 4′ or 4″', 7-di-O-methylcupressuflavone, 7,7″,4″'-tri-O-methyl agathisflavone and 7,4′,7″-tri-O-methylamentoflavone are new compounds and are being reported for the first time. The others are 7,7″-di-O-methylagathisflavone,7,4′,7″,4″'-tetra-O-methylamentoflavone and 7,4′,7″,4″'-tetra-O-methyl-cupressuflavone. Mass and NMR spectral studies are used for structural elucidation. In addition, the presence of several other biflavones has been indicated by TLC examination of methylated products.
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