反应详情

To a solution of 3-({2-[(cyclopropylcarbonyl)amino]imidazo[1,2-b]pyridazin-6-yl}oxy)benzoic acid (121 mg, 0.358 mmol) in N,N-dimethylformamide (5.0 mL) were added 1,3-dimethyl-1H-pyrazol-5-amine (47.8 mg, 0.43 mmol), 1-hydroxybenzotriazole (58 mg, 0.43 mmol), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (82.4 mg, 0.43 mmol) and triethylamine (45 mg, 0.43 mmol), and the mixture was stirred at room temperature for 24 hr. The solvent was evaporated under reduced pressure, ethyl acetate, tetrahydrofuran and water were added to the residue, 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 purified by silica gel column chromatography (ethyl acetate/hexane=20/80→90/10, then methanol/ethyl acetate=0/100→15/85), and precipitated from ethyl acetate/hexane to give the title compound (116 mg, 75%) as a white powder.

1. customThe solvent was evaporated under reduced pressure, ethyl acetate, tetrahydrofuran and water
2. additionwere added to the residue
3. extractionthe aqueous layer was extracted three times with ethyl acetate/tetrahydrofuran
4. washCombined organic layer was washed with saturated brine
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltrated
7. customThe solvent was evaporated under reduced pressure
8. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=20/80→90/10
9. custommethanol/ethyl acetate=0/100→15/85), and precipitated from ethyl acetate/hexane