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An efficient synthesis of novel 3-(piperidin-4-yl)isoxazolo[4,5-d]pyrimidine scaffold has been designed and deveopled. A series of 5-phenylurea derivatives was synthesized using this method. Their cytotoxic activities against breast cancer cell line BT-474 were evaluated by CCK-8 assay. Most of them showed potent anti-proliferative activities, of which compound 20 and 21 exhibited IC50s of 1.565μmol/L...
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