p-(Trifluoromethoxy)phenyl isocyanate → N-{7-cyano-6-[3-({[4-(trifluoromethoxy)phenyl]carbamoyl}amino)phenoxy]-1,3-benzothiazol-2-yl}acetamide

Participants

Reaction Steps

N-[6-(3-Aminophenoxy)-7-cyano-1,3-benzothiazol-2-yl]acetamide (150 mg, 0.462 mmol) produced in Example 12(ii) was dissolved in N,N-dimethylformamide (2 mL), 1-isocyanato-4-(trifluoromethoxy)benzene (91 μL, 0.60 mmol) was added, and the mixture was stirred at room temperature for 12 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 residue was purified by silica gel column chromatography (ethyl acetate/n-hexane=80/20→100/0), and the obtained solution was concentrated under reduced pressure. The residue was crystallized from diisopropyl ether to give the title compound (147 mg, 60%) as a white powder.

Provenance & Evidence