反应详情

A solution of 3-methyl-1-(2-pyridinyl)-1H-pyrazolo[3,4-b]quinoline-4-carbonitrile (0.30 g, 1.1 mmol) and conc. sulfuric acid (1.0 mL) in acetic acid (6.0 mL) was heated under reflux for 31.5 hours. The solution was allowed to cool to room temperature, and poured into iced water. The resulting solution was neutralized with an aqueous sodium hydroxide solution, and extracted with chloroform. The extract was washed with saturated brine and dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue thus obtained was recrystallized from methanol/isopropylether to give the title compound (0.14 g, 44% yield).

1. temperatureunder reflux for 31.5 hours
2. extractionextracted with chloroform
3. washThe extract was washed with saturated brine
4. dry with materialdried over anhydrous sodium sulfate
5. customthe solvent was evaporated under reduced pressure
6. customThe residue thus obtained
7. customwas recrystallized from methanol/isopropylether