反应详情

To a stirred solution of 1-(4-aminophenyl)-3-(3-pyridyl)-5-cyanopyrazole (130 mg, 0.5 mmol) in acetic acid (2 mL) and MeOH (6 mL) at room temperature was added 2-chloro-6-fluorobenzaldehyde (79 mg, 0.5 mmol), followed by sodium cyanoborohydride (79 mg, 1.25 mmol). The reaction mixture was stirred at room temperature for 16 h and then concentrated under a stream of nitrogen. The residue was diluted with water, extracted into ethyl acetate, washed with sodium bicarbonate solution and water, and dried (MgSO4). The residue obtained on concentration was flash chromatographed on silica gel (eluent, gradient of 20-30% EtOAc in CH2Cl2) to provide the title compound (103 mg, 51%). NMR (CDCl3, 400 MHz): 9.1 (s, 1H); 8.7 (br, 1H); 8.3 (d, 1H); 7.6-7.5 (overlapping m, 3H), 7.6-7.5 (overlapping m, 4H), 7.05 (m, 1H); 6.9 (d, 2H), 4.6 (s, 2H).

1. concentrationconcentrated under a stream of nitrogen
2. additionThe residue was diluted with water
3. extractionextracted into ethyl acetate
4. washwashed with sodium bicarbonate solution and water
5. dry with materialdried (MgSO4)
6. customThe residue obtained on concentration
7. customchromatographed on silica gel (eluent, gradient of 20-30% EtOAc in CH2Cl2)