https://repositorio.ufba.br/handle/ri/5814
Campo DC | Valor | Idioma |
---|---|---|
dc.contributor.author | Carvalho, Mário Geraldo de | - |
dc.contributor.author | Silva, Virginia C. da | - |
dc.contributor.author | Silva, Tânia Maria Sarmento da | - |
dc.contributor.author | Camara, Celso de Amorim | - |
dc.contributor.author | Braz Filho, Raimundo | - |
dc.creator | Carvalho, Mário Geraldo de | - |
dc.creator | Silva, Virginia C. da | - |
dc.creator | Silva, Tânia Maria Sarmento da | - |
dc.creator | Camara, Celso de Amorim | - |
dc.creator | Braz Filho, Raimundo | - |
dc.date.accessioned | 2012-05-09T19:07:15Z | - |
dc.date.available | 2012-05-09T19:07:15Z | - |
dc.date.issued | 2009 | - |
dc.identifier.issn | 0001-3765 | - |
dc.identifier.uri | http://www.repositorio.ufba.br/ri/handle/ri/5814 | - |
dc.description | p. 21-28 | pt_BR |
dc.description.abstract | The reaction of the flavonol 3,7,3', 4'-tetra-O-methylquercetin (1) and of the isoflavone 7,4'-di-O-methylgenistein (2) with alkaline iodine in methanol afforded four new iodine derivatives: 8-iodo-5-hydroxy-3,7,3', 4'-tetramethoxy- flavone (1a) and 6-iodo-5-hydroxy-3,7,3', 4'-tetramethoxyflavone (1b) from 1; 2 afforded a mixture of two compounds, identified as a racemic mixture of (±)-trans-5-hydroxy-2,3,7,4'-tetramethoxy-8-iodo-isoflavanone (2a) and (±)-trans-5-hydroxy-2,3,7,4'-tetramethoxy-6,8-diiodo-isoflavanone (2b). The formation of these different products reveals a significant difference involving the chemical interaction between the reactive site of α, β-unsaturated ketones of flavonol and isoflavone under the tested reaction conditions (using I2/KOH/MeOH). Furthermore, the trans stereo selectivity is noteworthy in the nucleophylic addition of methanol at the isoflavone α, β-unsaturated system. The structures were identified on the basis of spectral data, mainly 1D and 2D NMR and mass spectra. | pt_BR |
dc.language.iso | en | pt_BR |
dc.source | http://dx.doi.org/10.1590/S0001-37652009000100004 | pt_BR |
dc.subject | Flavonol | pt_BR |
dc.subject | Isoflavone | pt_BR |
dc.subject | Iodoflavonoid | pt_BR |
dc.subject | Iodoisoflavonoid | pt_BR |
dc.subject | Iodine derivatives | pt_BR |
dc.title | New iodine derivatives of flavonol and isoflavone | pt_BR |
dc.title.alternative | Anais da Academia Brasileira de Ciências | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.description.localpub | Rio de Janeiro | pt_BR |
dc.identifier.number | v. 81, n. 1. | pt_BR |
Aparece nas coleções: | Artigo Publicado em Periódico (Química) |
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