反应详情

To an ice-cold solution of 3-methyl-1-(2-pyridinyl)-1,9-dihydro-4H-pyrazolo[3,4-b]quinolin-4-one (1.11 g, 4.0 mmol) in N,N-dimethylformamide (16 mL), sodium hydride (oiliness, content 60%, 0.19 g, 4.8 mmol) was added and the mixture was stirred at room temperature for 1 hour. Subsequently, iodomethane (2.5 mL, 40.2 mmol) was added thereto at 0° C., and the mixture was stirred at room temperature for additional 16 hours. To the mixture was added iced water, and the mixture was made basic by the addition of an aqueous sodium hydroxide solution, and the organic matter was extracted with chloroform. The extract was washed with saturated brine and water, and dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The residue thus obtained was purified by basic silica gel column chromatography (hexane:ethyl acetate:chloroform=3:1:1) to give the title compound (0.47 g, 40% yield).

1. stirringat 0° C., and the mixture was stirred at room temperature for additional 16 hours
2. extractionthe organic matter was extracted with chloroform
3. washThe extract was washed with saturated brine and water
4. dry with materialdried over anhydrous magnesium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe residue thus obtained
7. customwas purified by basic silica gel column chromatography (hexane:ethyl acetate:chloroform=3:1:1)