A mixture of tert-butyl 4-(2-chloro-5-methylpyrimidin-4-yl)piperazine-1-carboxylate (0.15 g, 0.48 mmol), 4-amino-3-nitrobenzoic acid (97 mg, 0.53 mmol), BrettPhos-Pd Admixture (20 mg, 0.015 mmol), and cesium carbonate (470 mg, 1.44 mmol) in tBuOH (2.4 mL) was heated in a sealed tube at 100° C. overnight. The mixture was diluted with EtOAc, filtered through a celite plug, loaded onto silica gel and purified using 0-10% MeOH/DCM gradient to give the title compound (75 mg, 34%). MS (ES+) C21H26N6O6 requires: 458. found: 459 [M+H]+
