反应详情

温度

100 °C

To a solution of 2-(4-fluorophenyl)-2,3-dihydro-5-methyl-4H-1,2,3-triazol-4-one (i.e. the product of Step C, 3.1 g, 16 mmol) in N,N-dimethylformamide (70 mL) was added anhydrous potassium carbonate (6.2 g, 45 mmol) under an atmosphere of nitrogen. 4-Chloro-2-trifluoromethyl-pyridine (2.9 g, 16 mmol) was added and the mixture was heated to 100° C. for 20 h. The reaction mixture was diluted with water, then extracted with diethyl ether. The organic layer was washed successively with water and saturated aqueous sodium chloride solution, dried (MgSO4), filtered, and concentrated under reduced pressure. The crude material was purified by chromatography on silica gel eluting with 0 to 20% ethyl acetate in hexanes to obtain the title compound (4.2 g) as a viscous light yellow oil that solidified upon standing to form an off-white solid.

1. extractionextracted with diethyl ether
2. washThe organic layer was washed successively with water and saturated aqueous sodium chloride solution
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude material was purified by chromatography on silica gel eluting with 0 to 20% ethyl acetate in hexanes