Anais da Academia Brasileira de Ciências | |
Flavonoids from Lonchocarpus muehlbergianus | |
Aderbal F. Magalhães2  Ana M.g.a. Tozzi1  Eva G. Magalhães2  Ivani S. Blanco2  Maria-del-pilar C. Soriano2  | |
[1] ,UNICAMP Instituto de Química Departamento de Química OrgânicaCampinas SP ,Brasil | |
关键词: Lonchocarpus muehlbergianus; Leguminosae; flavonoids; flavans; Lonchocarpus muehlbergianus; Leguminosae; flavonóides; flavanas; | |
DOI : 10.1590/S0001-37652004000400004 | |
来源: SciELO | |
【 摘 要 】
The light petroleum extract from the roots of Lonchocarpus muehlbergianus Hassl contained nine flavonoids, including six new ones. These are 2,4-cis-2,4,5,8-tetramethoxy-(2´´,3´´:6,7)-furanoflavan; 2,4-cis-4-hydroxy-2,5,8-trimethoxy-(2´´,3´´:6,7)-furanoflavan; 2,4-cis-2-prenyloxy-4,5,8-trimethoxy-(2´´,3´´:6,7)-fu-ranoflavan; 2,4-cis-2-prenyloxy-4-hydroxy-5,8-dimethoxy-(2´´,3´´:6,7)-furanoflavan; 2',5',6'-trimethoxy-9-(1,1-dimethylallyoxy)-[2´´,3´´:3´,4´]-furanochalcone; 5,6-dimethoxy-(2´´,3´´:7,8)-furanoflavone, identi-fied by analysis of their spectral data (UV, IR, ¹H and 13C NMR, 2D-NMR, NOE and MS). The natural occurrence of 2,4-dioxygenated flavan derivatives is being reported for the first time. Quantitative analysis of the petrol extract, by using reversed-phase HPLC, showed that the most abundant flavonoid in the extract is 2,4-cis-2,4,5,8- tetramethoxy-(2´´,3´´:6,7)-furanoflavan.
【 授权许可】
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