反应详情

A mixture of N-[6-(3-fluoro-5-nitrophenoxy)[1,2,4]triazolo[1,5-a]pyridin-2-yl]cyclopropanecarboxamide (130 mg, 0.364 mmol), reduced iron (150 mg), concentrated hydrochloric acid (300 μL), ethanol (3 mL) and water (3 mL) was stirred under refluxing conditions for 1 hr. The reaction mixture was filtered through celite, and the filtrate was concentrated under reduced pressure. The residue was dissolved in N,N-dimethylacetamide (3 mL). 1,3-Dimethyl-1H-pyrazole-5-carbonyl chloride (69.3 mg, 0.437 mmol) was added thereto with stirring under ice-cooling, and the mixture was stirred at room temperature for 15 hr. The reaction mixture was diluted with saturated aqueous sodium hydrogen carbonate solution and extracted with ethyl acetate. The organic layer was washed with water and saturated brine, dried over anhydrous magnesium sulfate and filtrated. The filtrate was concentrated under reduced pressure, and the residue was purified by column chromatography (NH silica gel, ethyl acetate) and recrystallized from ethyl acetate to give the title compound (45.0 mg, 28%) as a white solid.

1. filtrationThe reaction mixture was filtered through celite
2. concentrationthe filtrate was concentrated under reduced pressure
3. dissolutionThe residue was dissolved in N,N-dimethylacetamide (3 mL)
4. stirringwith stirring under ice-
5. temperaturecooling
6. stirringthe mixture was stirred at room temperature for 15 hr
7. extractionextracted with ethyl acetate
8. washThe organic layer was washed with water and saturated brine
9. dry with materialdried over anhydrous magnesium sulfate
10. filtrationfiltrated
11. concentrationThe filtrate was concentrated under reduced pressure
12. customthe residue was purified by column chromatography (NH silica gel, ethyl acetate)
13. customrecrystallized from ethyl acetate