Dimethylformamide → N-(3-{[2-(acetylamino)-7-cyano-1,3-benzothiazol-6-yl]oxy}phenyl)-4-chloro-3-(1-cyano-1-methylethyl)benzamide

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To a solution of 4-chloro-3-(1-cyano-1-methylethyl)benzoic acid (83 mg, 0.370 mmol) in tetrahydrofuran (2 mL) were added oxalyl chloride (40 μL, 0.462 mmol) and N,N-dimethylformamide (5 μL), and the mixture was stirred at room temperature for 1 hr. The reaction mixture was concentrated under reduced pressure, and the residue was dissolved in N,N-dimethylacetamide (2 mL). N-[6-(3-Aminophenoxy)-7-cyano-1,3-benzothiazol-2-yl]acetamide (100 mg, 0.308 mmol) produced in Example 12(ii) was added to the solution, and the mixture was stirred at room temperature for 10 hr. The reaction mixture was diluted with ethyl acetate (10 mL), washed successively with 5% aqueous sodium hydrogen carbonate solution (5 mL) and saturated brine (5 mL), and dried over anhydrous sodium sulfate. Insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The obtained residue was crystallized from ethyl acetate to give the title compound (108 mg, 66%) as a white powder.

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