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0 °C

To a suspension of N-(5-((2-aminopyridin-4-yl)oxy)pyridin-2-yl)-1,5-dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxamide (0.25 g, 0.6 mmol) in DCM (20 mL) was added pyridine (0.65 mL, 6 mmol). The suspension was cooled to 0° C., followed by slowly addition of a solution of phenylcarbonochloridate (98 mg, 0.63 mmol) in DCM (5 mL). The reaction was stirred at rt for 2 hours, diluted with DCM (20 mL), and then washed with water (25 mL×2), followed by washing with brine (25 mL). The organic solution was dried over anhydrous Na2SO4, then concentrated in vacuo, and the residue was purified by a silica gel column chromatography (DCM/MeOH (v/v)=100/1) to give the title compound as a white solid (134 mg, 42%).

1. washwashed with water (25 mL×2)
2. washby washing with brine (25 mL)
3. dry with materialThe organic solution was dried over anhydrous Na2SO4
4. concentrationconcentrated in vacuo
5. customthe residue was purified by a silica gel column chromatography (DCM/MeOH (v/v)=100/1)