反应详情

A suspension of 6-(3-{[3-(trifluoromethyl)benzoyl]amino}phenoxy)imidazo[1,2-b]pyridazine-2-carboxylic acid (111 mg, 0.25 mmol), diphenylphosphoryl azide (103 mg, 0.375 mmol), triethylamine (51 mg, 0.5 mmol) and tert-butanol (5.0 mL) was stirred at room temperature for 5 min, heated to 100° C. and stirred overnight. After allowing the reaction mixture to cool to room temperature, ethyl acetate was added to the mixture, and the mixture was washed with saturated aqueous sodium hydrogencarbonate solution, dried over anhydrous magnesium sulfate, and filtrated. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/19→ethyl acetate alone) to give the title compound (79 mg, 39%) as a white solid.

1. temperatureheated to 100° C.
2. stirringstirred overnight
3. temperatureto cool to room temperature
4. washthe mixture was washed with saturated aqueous sodium hydrogencarbonate solution
5. dry with materialdried over anhydrous magnesium sulfate
6. filtrationfiltrated
7. customThe solvent was evaporated under reduced pressure
8. customthe residue was purified by silica gel column chromatography (ethyl acetate/hexane=1/19→ethyl acetate alone)