反应详情

A solution of tert-butyl (Z)-4-({2-[(1H-pyrazolo[3,4-b]pyridin-3-yl)methylene]-3-oxo-2,3-dihydrobenzofuran-7-yl}methyl)piperazine-1-carboxylate (0.0292 g, 0.0633 mmol) in methylene chloride (3 mL) was added with a 4 M solution of hydrogen chloride in 1,4-dioxane (2 mL), and the mixture was stirred at room temperature for 2 hours. The reaction mixture was concentrated, the resulting residue was added with saturated aqueous sodium hydrogencarbonate, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, then the solvent was evaporated, and the resulting residue was purified by silica gel column chromatography (aminopropyl silica was used, chloroform/methanol) to obtain (Z)-2-[(1H-pyrazolo[3,4-b]pyridin-3-yl)methylene]-7-(piperazin-1-ylmethyl)benzofuran-3(2H)-one (0.0132 g, 58%).

1. concentrationThe reaction mixture was concentrated
2. additionthe resulting residue was added with saturated aqueous sodium hydrogencarbonate
3. extractionthe mixture was extracted with ethyl acetate
4. dry with materialThe organic layer was dried over anhydrous sodium sulfate
5. customthe solvent was evaporated
6. customthe resulting residue was purified by silica gel column chromatography (aminopropyl silica was used, chloroform/methanol)