Biflavones from the leaves of Araucaria excelsa |
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| Authors: | Najma Ilyas M Ilyas W Rahman M Okigawa N Kawano |
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| Institution: | 1. Department of Chemistry, Aligarh Muslim University, Aligarh, India;2. Faculty of Pharmaceutical Sciences, Nagasaki University, Nagasaki, Japan |
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| Abstract: | Eight 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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| Keywords: | Araucariaceae biflavones new methyl ethers amentoflavone cupressuflavone agathisflavone |
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