Dimethylformamide → HCID 57505514, compound

Participants

Reaction Steps

To a solution of 1,5-dimethyl-1H-pyrazole-3-carboxylic acid (109 mg, 0.78 mmol) in tetrahydrofuran (4.0 mL) were added N,N-dimethylformamide (30 μL, 0.39 mmol) and oxalyl chloride (135 μL, 1.55 mmol), and the mixture was stirred at room temperature for 1 hr. The solvent was evaporated under reduced pressure, and a solution of the residue in tetrahydrofuran (2.0 mL) was added dropwise to a solution of N-[6-(3-aminophenoxy)imidazo[1,2-b]pyridazin-2-yl]cyclopropylcarboxamide (200 mg, 0.65 mmol) and triethylamine (360 μL, 2.59 mmol) in tetrahydrofuran (4.0 mL). After stirring at room temperature for 2 hr, water was added to the reaction mixture, and the mixture was extracted with ethyl acetate/tetrahydrofuran, 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 (hexane/ethyl acetate=1/4→ethyl acetate) and precipitated from hexane/ethyl acetate to give the title compound (118 mg, 42%) as a white powder.

Provenance & Evidence