反应详情

To a suspension of 4-bromo-pyridine-2-carboxylic acid (1.00 g, 5.00 mmol) in dimethylformamide (10 mL) was added 1-methylmorpholine (1.1 mL, 10 mmol) and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyl-uronium hexafluorophosphate (HATU) (2.37 g, 6.23 mmol). The mixture became an orange solution after 10 minutes. Aniline (0.5 mL, 5.5 mmol) was added and the solution was stirred at room temperature for 66 hours. The dimethylformamide was evaporated in vacuo and the residue was partitioned between water and ethyl acetate. The separated water layer was extracted with ethyl acetate. The combined ethyl acetate extract was washed with water and saturated sodium bicarbonate. The organic layer was dried (MgSO4), filtered and evaporated to crude 2. Chromatography on silica gel (40 g) applied in dichloromethane and eluted with hexanes:ethyl acetate (1:1) gave the title compound (0.986 g, 71%).

1. customafter 10 minutes
2. customThe dimethylformamide was evaporated in vacuo
3. customthe residue was partitioned between water and ethyl acetate
4. extractionThe separated water layer was extracted with ethyl acetate
5. extractionThe combined ethyl acetate extract
6. washwas washed with water and saturated sodium bicarbonate
7. dry with materialThe organic layer was dried (MgSO4)
8. filtrationfiltered
9. customevaporated to crude 2
10. washeluted with hexanes:ethyl acetate (1:1)