反应详情

To a solution of 2-methyl-5-(trifluoromethyl)-1,3-oxazole-4-carboxylic acid (241 mg, 1.23 mmol) in tetrahydrofuran (5 mL) were added N,N-dimethylformamide (2 drops) and oxalyl chloride (268 μL, 3.08 mmol), and the mixture was stirred at room temperature for 3 hr. The reaction mixture was concentrated under reduced pressure, and the residue was dissolved in N,N-dimethylacetamide (6 mL). The mixture was stirred at room temperature, N-[6-(3-amino-4-methylphenoxy)[1,2,4]triazolo[1,5-a]pyridin-2-yl]cyclopropanecarboxamide (200 mg, 0.619 mmol) was added thereto, and the mixture was stirred at room temperature for 62 hr. Methanol (5 mL), tetrahydrofuran (5 mL), water (5 mL) and sodium carbonate solution (2 mL) were added to the reaction mixture, and the mixture was stirred at room temperature for 2 hr. The reaction solution was concentrated under reduced pressure, and ethyl acetate was added to the residue. A white precipitate was collected by filtration, and the filtrate was washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over anhydrous magnesium sulfate and filtrated. The filtrate was concentrated under reduced pressure, and a white precipitate obtained above was added to the residue. The mixture was recrystallized from ethanol to give the title compound (252 mg, 81%) as a white solid.

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. dissolutionthe residue was dissolved in N,N-dimethylacetamide (6 mL)
3. stirringThe mixture was stirred at room temperature
4. stirringthe mixture was stirred at room temperature for 62 hr
5. stirringthe mixture was stirred at room temperature for 2 hr
6. concentrationThe reaction solution was concentrated under reduced pressure, and ethyl acetate
7. additionwas added to the residue
8. filtrationA white precipitate was collected by filtration
9. washthe filtrate was washed with saturated aqueous sodium hydrogen carbonate solution and saturated brine
10. dry with materialdried over anhydrous magnesium sulfate
11. filtrationfiltrated
12. concentrationThe filtrate was concentrated under reduced pressure
13. customa white precipitate obtained
14. additionabove was added to the residue
15. customThe mixture was recrystallized from ethanol