Sodium Carbonate → 6-[1-(1-Ethoxyethyl)-1H-pyrazol-4-yl]-1,2,4-triazin-3-amine

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Sodium carbonate (510 mg, 4.8 mmol) in water (1 mL) was added to a mixture of 6-bromo-1,2,4-triazin-3-amine (0.420 g, 2.40 mmol), 1-(1-ethoxyethyl)-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.766 g, 2.88 mmol), and tetrakis(triphenylphosphine)palladium (100 mg, 0.1 mmol) in toluene (7 mL) and ethanol (5 mL). The resulting mixture was heated at 110° C. for 2 h. The mixture was cooled to RT, diluted with water, and extracted with chloroform. The combined organic layers were dried over Na2SO4, filtered, and concentrated. The residue was treated with CH2Cl2/Et2O and filtered to give the desired product (0.39 g, 69%). LCMS: (M+H)=235.4.

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