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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...
A novel chlorin derivative of Meso-tris(pentafluorophenyl)-4-pyridylporphyrin: ...
Maestrin,Ana Paula J.; Ribeiro,Anderson O.; Tedesco,Antonio Cláudio; Neri,Cláudio R.; Vinhado,Fábio S.; Serra,Osvaldo A.; Martins,Patrícia R.Photodynamic therapy (PDT) is based on the accumulation of a photosensitizer, such as a porphyrin or a chlorin, in a malignant tissue after its administration. Chlorins exhibit photophysical properties similar to those of the porphyrin macrocycles, but with intensified and red-shifted Q bands, making chlorin-containing systems even better candidates for PDT. In this contribution, we report the synthesis of 5,10...
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