NMR spectral assignments of a new [C--O--C] isoflavone dimer from Andira surinamensis |
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Authors: | de Almeida José Gustavo L Silveira Edilberto R Pessoa Otília Deusdênia L |
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Affiliation: | Departamento de Química Organica e Inorganica, Centro de Ciências, Universidade Federal do Ceará, CP 12200, 60021-940, Fortaleza-CE, Brazil. |
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Abstract: | The phytochemical investigation of extracts from the branch wood and branch barks of Andira surinamensis yielded a novel isoflavone dimer, 4'-methoxyisoflavone-(7-O-7')-3',4'-methylenedioxyisoflavone (surinamensin), along with the triterpene lupeol and the known isoflavones 5,7-dihydroxy-4'-methoxyisoflavone (biochanin A), 5,4'-dihydroxy-7-methoxyisoflavone (prunetin), 7,3'-dihydroxy-4'-methoxyisoflavone (calycosin), and 5,7,3'-trihydroxy-4'-methoxyisoflavone (pratensein). The structure of the new isoflavone was elucidated by 1D and 2D homonuclear and heteronuclear NMR spectroscopy and by comparison with published data for closely related compounds. |
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Keywords: | 1H NMR 13C NMR 2D NMR Andira surinamensis Leguminosae isoflavones |
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