Sodium Bicarbonate → N-[5-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)-2-fluorophenyl]-1,3-dimethyl-1H-pyrazole-5-carboxamide

Participants

Reaction Steps

To a solution of N-[6-(3-amino-4-fluorophenoxy)imidazo[1,2-b]pyridazin-2-yl]cyclopropanecarboxamide (100 mg, 0.306 mmol) in N,N-dimethylacetamide (4.0 mL) was added a solution of 1,3-dimethyl-1H-pyrazole-5-carbonyl chloride (51 mg, 0.321 mmol) in N,N-dimethylacetamide (1.0 mL) under ice-cooling, and the mixture was stirred at room temperature for 30 min. Under ice-cooling, aqueous sodium hydrogencarbonate solution was added to the reaction mixture, and the mixture was extracted with ethyl acetate, washed with saturated brine, dried over anhydrous magnesium sulfate, and filtrated. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (methanol/ethyl acetate=0/100→5/95) and recrystallized from methanol/ethyl acetate to give the title compound (88.8 mg, 65%) as pale-yellow crystals. melting point 237° C.

Provenance & Evidence