反应详情

To a suspension of 4,6-diphenyl-5-(4-pyridyl)-1H-pyrazolo[3,4-b]pyridine (0.10 g, 0.3 mmol, obtained in example 2) in acetone (1 mL), KOH (21 mg, 0.4 mmol) was added under argon atmosphere. Then, a solution of iodomethane (47 mg, 0.3 mmol) in acetone (0.1 mL) was added and stirred overnight at room temperature. Water was added and extracted with CHCl3. The organic phase was dried over Na2SO4 and concentrated to dryness. The crude product obtained was purified by chromatography on silica gel using hexane-EtOAc mixtures of increasing polarity as eluent, to afford 47 mg of 2-methyl-4,6-diphenyl-5-(4-pyridyl)pyrazolo[3,4-b]pyridine (yield: 47%) and 38 mg of 1-methyl-4,6-diphenyl-5-(4-pyridyl)pyrazolo[3,4-b]pyridine (yield: 38%).

1. additionwas added under argon atmosphere
2. extractionextracted with CHCl3
3. dry with materialThe organic phase was dried over Na2SO4
4. concentrationconcentrated to dryness
5. customThe crude product obtained
6. customwas purified by chromatography on silica gel
7. temperatureof increasing polarity as eluent