Dimethylformamide → N-(3-{[2-(acetylamino)-7-cyano-1,3-benzothiazol-6-yl]oxy}phenyl)-2-(3-bromophenyl)-2-methylpropanamide

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To a solution of 2-(3-bromophenyl)-2-methylpropionic acid (89 mg, 0.361 mmol) in tetrahydrofuran (1 mL) were added oxalyl chloride (40 μL, 0.466 mmol) and N,N-dimethylformamide (10 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 (1 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 1 hr. The reaction mixture was diluted with ethyl acetate (12 mL), washed successively with 5% aqueous sodium hydrogen carbonate solution (6 mL) and saturated brine (6 mL), and dried over anhydrous sodium sulfate. 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/n-hexane=30/70→80/20), and the obtained solution was concentrated under reduced pressure. The residue was crystallized from ethanol to give the title compound (136 mg, 81%) as a white powder.

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