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New iodine derivatives of flavonol and isoflavone
Carvalho,Mário G. de; Silva,Virginia C. da; Silva,Tânia M.S. da; Camara,Celso A.; Braz-Filho,RaimundoThe 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'-...
Date: 2009
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Origin: Oasisbr