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Tetrahydroquinazoline-substituted chromones from Diels–Alder reaction of (E)-2-...
Patoilo, Diana; Silva, Artur; Pinto, Diana; Santos, Clementina M.M.; Tomé, Augusto; Cavaleiro, JoséThe Diels-Alder reaction of (E)-2-styrylchromones with a pyrimidine ortho-quinodimethane is reported for the first time. These cycloaddition reactions afford mixtures of two regioisomeric tetrahydroquinazoline-substituted chromones in moderate to excellent global yields. Irrespectively of the substituents on the 2-styrylchromones, the 2-(7-aryl-4-methoxy-2-methyl-5,6,7,8-tetrahydroquinazolin-6-yl)chromone deriv...
Synthesis of Benzo[a]naphtho[2,3-c]xanthones from 2-styrylchromones
Tomé, Sara; Patoilo, Diana; Santos, Clementina M.M.; Silva, Artur2-Styrylchromones, a small group of natural occurring chromones vinylogues of flavones (2-phenylchromones) have been ex tensively studied (both by synthesis and transformations)111 due to their known important biological activities. 121 Following our interest in 2-styrylchromones and exploiting its reactivity as synthons in the preparation of other type of compounds, we studied their reactivity as dienophile in...
Síntese e transformações de Diels-Alder de 2-estirilcromonas: síntese de flavon...
Patoilo, Diana TorrãoNa primeira parte desta dissertação reporta-se a síntese de 2-estirilcromonas, 5-hidroxi-2-estirilcromonas e benziloxi-2-estirilcromonas; e de precursores de dienos do tipo o-quinodimetanos, 2,2-dióxido de 1,3-di-hidrobenzo[c]tiofeno, 2,2-dióxido de 4,7-dimetoxi-1,3-di-hidrobenzo[c]tiofeno e 6,6-dióxido de 2- metil-4-metoxi-5,7-di-hidrotieno[3,4-d]pirimidina. Na segunda parte desta dissertação reportam-se os es...
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