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- W2015148436 abstract "We have previously reported that a series of 4-[4-(N-substituted (thio)carbamoyl)-1-piperazinyl]-6,7-dimethoxyquinazoline derivatives were potent and selective inhibitors of platelet-derived growth factor receptor (PDGFR) phosphorylation and demonstrated several biological effects such as suppression of neointima formation following balloon injury in rat carotid artery by oral administration. Here, we investigated structure-activity relationships of the 6,7-dimethoxyquinazolinyl moiety. In regard to 6,7-dimethoxy groups, ethoxy analogues showed potent activity (IC(50) of 16b is 0.04 microM; IC(50) of 17a is 0.01 microM) and further extension of the alkyl group reduced activity. Interestingly, methoxyethoxy (IC(50) of 16j is 0.02 microM; IC(50) of 17h is 0.01 microM) and ethoxyethoxy (IC(50) of 17j is 0.02 micro M) analogues showed the most potent activity, suggesting that the inserted oxygen atom significantly interacts with beta-PDGFR. Among tricyclic quinazoline derivatives, the 2-oxoimidazo[4,5-e]quinazoline derivative 21a showed potent activity (IC(50) = 0.10 microM). Regarding replacements of quinazoline by other heterocyclic rings, pyrazolo[3,4-d]pyrimidine (39a, IC(50) = 0.17 microM) and quinoline (IC(50) of 40a is 0.18 microM; IC(50) of 40b is 0.09 microM) derivatives showed potent activity. Isoquinoline and some pyridopyrimidine derivatives were completely inactive; therefore, 1-aza has an important role. Also 7-aza and 8-aza substitution on the parent quinazoline ring has a detrimental effect on the interaction with beta-PDGFR. We also demonstrated that the substituents on the quinazoline ring possess major consequences for metabolic polymorphism. Although there existed extensive metabolizers and poor metabolizers in Sprague-Dawley rats administrated 6,7-dimethoxyquinazoline derivatives (1b and 1c), 6-(2-methoxy)ethoxy-7-methoxyquinazoline analogue 16k showed no metabolic polymorphism." @default.
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- W2015148436 date "2003-10-14" @default.
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- W2015148436 title "Potent and Selective Inhibitors of Platelet-Derived Growth Factor Receptor Phosphorylation. 3. Replacement of Quinazoline Moiety and Improvement of Metabolic Polymorphism of 4-[4-(<i>N</i>-Substituted (thio)carbamoyl)-1-piperazinyl]-6,7-dimethoxyquinazoline Derivatives" @default.
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- W2015148436 doi "https://doi.org/10.1021/jm020505v" @default.
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