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|Title:||Epoxidation of 2-Styrylchromone derivatives|
|Authors:||Santos, Clementina M.M.|
|Citation:||Santos, Clementina M.M.; Silva, Artur; Cavaleiro, José; Patonay, Támas; Levaí, Albert (2004) - Epoxidation of 2-Styrylchromone Derivatives. In XXIst European Colloquim on Heterocyclic Chemistry. Sopron|
|Abstract:||2-Styrylchromones constitute a small group of natural heterocyclic compounds with significant biological properties. Certain natural and synthetic hydroxyl derivatives have shown important pharmacological and mainly antioxidant activities [1 ,2]. We are interested in the design of new 2-styrylchromones analogues containing hydroxyl groups at C-3 and in the Ca=C~ systems because they could increase the antioxidation activity of these type of compounds . Our first approach is the preparation of epoxy systems and then we will try to open the epoxy ring to give the desired hydroxyl derivatives. We studied the epoxidation of 2-styryl-chromones 1 with hydrogen peroxide and iodosylbenzene using [salen Mn(lll)] as catalyst, and the epoxy products 2 were obtained in moderate yields. Since the best results were obtained with iodosylbenzene, we applied oxidant to compounds 3 in order to prepare 4. In this communication, we will report the synthetic details and the structural characterisation of the epoxides 3 and 4.|
|Appears in Collections:||PTV - Resumos em Proceedings Não Indexados ao ISI/Scopus|
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