Hydrochloric Acid → 3-({2-[(Cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)benzoic acid

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To a solution of methyl 3-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)benzoate (225 mg, 0.64 mmol) in tetrahydrofuran (5.0 mL) was added 1N sodium hydroxide (2.5 mL), and the mixture was stirred at room temperature for 24 hr. 1N Hydrochloric acid was added to the mixture (pH=3), and the aqueous layer was extracted three times with ethyl acetate/tetrahydrofuran. Combined organic layer was washed with saturated brine, dried over anhydrous sodium sulfate, and filtrated. The solvent was evaporated under reduced pressure, and the residue was filtrated, and washed with ethyl acetate/hexane to give the title compound (150 mg, 69%) as a white powder.

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