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Microwave-assisted synthesis of chromeno[3,4-b]xanthones and (benzo[c]cromenyl)chromones

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Resumo:Following previous reports dealing with the reactivity of chromone derivatives in Diels-Alder reactions, series of novel (E)-2-[2-(prop-2-yn-1-yloxy)styryl]chromones and of 2-{(1E,3E)-4-[2- (prop-2-yn-1-yloxy)phenyl]buta-1,3-dien-1-yl}chromones were designed and synthesized through aldol condensation of 2-methylchromones with 2-propargyloxy(benzaldehyde and cinnamaldehyde), respectively. Both chromone derivatives were used as substrates in microwave-assisted intramolecular Diels-Alder reactions, affording chromeno[3,4-b]xanthones and (benzo[c]chromenyl)chromones. This is the first report involving chromone derivatives in intramolecular Diels-Alder reactions for the synthesis of new oxygen heterocycles, namely xanthones and flavones [1-2].
Autores principais:Albuquerque, Hélio
Outros Autores:Santos, Clementina M.M.; Cavaleiro, José; Silva, Artur
Assunto:Propargyloxychromones Intramolecular Diels-Alder Flavones Xanthones MW - assisted organic transformations
Ano:2017
País:Portugal
Tipo de documento:documento de conferência
Tipo de acesso:acesso aberto
Instituição associada:Instituto Politécnico de Bragança
Idioma:inglês
Origem:Biblioteca Digital do IPB

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