A mixture of 4-((4-(4-(tert-butoxycarbonyl)piperazin-1-yl)-5-methylpyrimidin-2-yl)amino)-3-nitrobenzoic acid (0.075 g, 0.164 mmol), 1-methylpiperidin-4-amine (37 mg, 0.33 mmol), HATU (140 mg, 0.37 mmol), and DIEA (0.1 mL, 0.6 mmol) in DMF (3.0 mL) was stirred at room temperature overnight. The reaction mixture was diluted with EtOAc, washed with aqueous saturated sodium bicarbonate solution and saturated brine solution. The crude mixture was loaded onto silica gel and purified using 0-10% MeOH/DCM gradient containing 10% NH4OH to give the title compound (73 mg, 80%). MS (ES+) C27H38N8O5 requires: 554. Found: 555 [M+H]+
