To a solution of 2-chloro-3-(1-cyanocyclopropyl)benzoic acid (0.11 g, 0.5 mmol) produced in Example C62(ii) in oxalyl chloride (0.5 mL) was added N,N-dimethylformamide (40 μL), and the mixture was stirred at room temperature for 30 min, and concentrated to dryness under reduced pressure. This was dissolved in a mixture of N,N-dimethylacetamide (1 mL) and tetrahydrofuran (1 mL), and the solution was added dropwise to a solution of N-[5-(5-amino-2-fluorophenoxy)[1,3]thiazolo[5,4-b]pyridin-2-yl]acetamide (0.11 g, 0.33 mmol) produced in Example C73(vi) in N,N-dimethylacetamide (1 mL) under ice-cooling. The reaction mixture was stirred at room temperature for 3 hr, and poured into water (100 mL), and the mixture was extracted with ethyl acetate (100 mL×2). The ethyl acetate layers were combined, and dried over anhydrous sodium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (ethyl acetate/hexane=0/100→100/0), and recrystallized from methanol to give the title compound (50 mg, 29%) as colorless crystals.
