To a solution of 3-(1,1,2,2-tetrafluoroethoxy)benzoic acid (44 mg, 0.185 mmol) in pyridine (2.0 mL) was added O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (70 mg, 0.185 mmol), and the mixture was stirred at room temperature for 10 min. N-[5-(5-Amino-2-methylphenoxy)[1,3]thiazolo[5,4-b]pyridin-2-yl]cyclopropanecarboxamide (60 mg, 0.176 mmol) produced in Example C47(i) was added to the obtained solution, and the mixture was stirred at 70° C. for 20 hr. After the reaction mixture was cooled to room temperature, water (2 mL) was added, and the obtained precipitate was collected by filtration, washed with water and ethyl acetate, and dried to give the title compound (55 mg, 56%) as a colorless powder.
