Formic Acid → HCID 86646005, 화합물

Formic acid (2.5 mL, 66.3 mmol) and acetic anhydride (5 mL, 52.9 mmol) were mixed, and stirred with heating at 50° C. for 3 hr. The reaction mixture was cooled to room temperature, diluted with tetrahydrofuran (50 mL), and cooled to 0° C. A solution of N-(3-aminophenyl)-3-(trifluoromethyl)benzamide (5.65 g, 20.2 mmol) in tetrahydrofuran (50 mL) was added to the reaction mixture, and the mixture was stirred at the same temperature for 16 hr, during which the reaction temperature was allowed to gradually warm to room temperature. The reaction solution was concentrated under reduced pressure, and the residue was dissolved in tetrahydrofuran (50 mL) and ethyl acetate (250 mL). The solution was washed with saturated aqueous sodium hydrogen carbonate solution (150 mL×2) and saturated aqueous ammonium chloride solution (150 mL), and dried over anhydrous magnesium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure to give N-[3-(formylamino)phenyl]-3-(trifluoromethyl)benzamide as a yellow amorphous substance. To a solution of N-[3-(formylamino)phenyl]-3-(trifluoromethyl)benzamide produced above in tetrahydrofuran (100 mL) was added a 1.9M solution (21 mL, 39.9 mmol) of borane-dimethylsulfide complex in tetrahydrofuran, and the mixture was stirred at room temperature for 1.5 hr. Since the starting materials were not completely consumed, a 1.9M solution (2 mL, 3.8 mmol) of borane-dimethylsulfide complex in tetrahydrofuran was added, and the mixture was further stirred at room temperature for 1 hr. Methanol (30 mL) and acetic acid (10 mL) were added to the reaction solution, the mixture was stirred at room temperature for 14 hr, and the reaction solution was concentrated under reduced pressure. The residue was dissolved in ethyl acetate (250 mL), and the solution was washed with saturated aqueous sodium hydrogen carbonate solution (100 mL×2) and saturated brine (100 mL), and dried over anhydrous magnesium sulfate. The insoluble material was filtered off, and the filtrate was concentrated under reduced pressure. The residue was recrystallized from ethyl acetate and hexane to give the title compound (5.54 g, total yield of 2 steps 93%) as yellow crystals.