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0 °C

To a solution of tert-butyl [4-({2-[(cyclopropylcarbonyl)amino][1,3]thiazolo[5,4-b]pyridin-5-yl}oxy)-3-fluorophenyl]carbamate (0.50 g, 1.12 mmol) in trifluoroacetic acid (10 mL) was added anisole (0.5 mL), and the mixture was stirred at 0° C. for 2 hr. Trifluoroacetic acid was evaporated under reduced pressure, ethyl acetate was added to the residue, and the mixture was washed with saturated aqueous sodium hydrogen carbonate and saturated brine in this order, dried over anhydrous magnesium sulfate and filtered. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1→1/9) to give the title compound (294 mg, 76%) as a white solid.

1. customTrifluoroacetic acid was evaporated under reduced pressure, ethyl acetate
2. additionwas added to the residue
3. washthe mixture was washed with saturated aqueous sodium hydrogen carbonate and saturated brine in this order
4. dry with materialdried over anhydrous magnesium sulfate
5. filtrationfiltered
6. customThe solvent was evaporated under reduced pressure
7. customthe residue was purified by silica gel column chromatography (hexane/ethyl acetate=1/1→1/9)