[CH2:1]([OH:5])[CH2:2][CH2:3][CH3:4].[H-].[Na+].Cl[C:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[N:12]=[C:11]2[N:19]([C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][N:24]=3)[N:20]=[C:21]([CH3:22])[C:10]=12>O1CCCC1>[CH2:1]([O:5][C:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[N:12]=[C:11]2[N:19]([C:23]3[CH:28]=[CH:27][CH:26]=[CH:25][N:24]=3)[N:20]=[C:21]([CH3:22])[C:10]=12)[CH2:2][CH2:3][CH3:4]To an ice-cold solution of 1-butanol (5.0 g, 68 mmol) in tetrahydrofuran (15 mL), sodium hydride (oiliness, content 60%, 0.41 g, 17 mmol) was added at room temperature and the mixture was stirred for 15 minutes. Subsequently, 4-chloro-3-methyl-1-(2-pyridinyl)-1H-pyrazolo[3,4-b]quinoline (1.0 g, 3.39 mmol) was added to the mixture at 0° C., and the mixture was heated under reflux for another 1 hour. After the reaction solution was cooled to room temperature, the reaction solvent was concentrated and evaporated under reduced pressure. To the reaction mixture was added iced water and the mixture was neutralized by the addition of dilute hydrochloric acid, and the organic matter was extracted with ethyl acetate. 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 silica gel column chromatography (ethyl acetate) to give the title compound (0.29 g, 26% yield).
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