General procedure for the synthesis of 5-bromo-2,6-bis(1H-pyrazol-1-yl)pyrimidin-4-amine from pyrazole and 5-bromo-6-chloro-2-(1H-pyrazol-1-yl)pyrimidin-4-amine: to a 3 mL DMF solution containing 0.15 g (0.55 mmol) of 5-bromo-6-chloro-2-(1H-pyrazol-1-yl)pyrimidin-4-amine (Intermediate 5). 0.11 g (1.64 mmol) of 1H-pyrazole and 0.18 g (0.55 mmol) of cesium carbonate were added sequentially. The reaction mixture was stirred at 85°C for 24 hours. After completion of the reaction, the solvent DMF was removed by distillation under reduced pressure. the crude product was washed with water and dried to give 0.13 g (77% yield) of the target compound.1H NMR (300 MHz, DMSO-d6) δ: 6.57 (dd, 1H), 6.60 (dd, 1H), 7.52 (s, 1H), 7.81 (d, 1H), 7.87 (d, 1H) , 8.41 (s, 1H), 8.51 (d, 1H), 8.60 (d, 1H).
