[CH3:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][C:10]=1[CH3:11])[C:7](=[O:12])[N:6]([C:13]1[CH:14]=[N:15][CH:16]=[CH:17][CH:18]=1)[C:5]2=[O:19].[BH4-].[Na+].O>CO.O1CCCC1>[CH3:11][C:10]1[CH:9]=[C:8]2[C:4](=[CH:3][C:2]=1[CH3:1])[C:5](=[O:19])[N:6]([C:13]1[CH:14]=[N:15][CH:16]=[CH:17][CH:18]=1)[CH:7]2[OH:12]The product of above-mentioned (7-a) (0.50 g, 2.0 mmol) was suspended in methanol (10 ml) and tetrahydrofuran (10 ml), and sodium borohydride (75 mg, 2.0 mmol) was added by portions thereto with stirring under ice cooling, followed by stirring at the same temperature for 30 minutes. To the reaction solution was added water, and the precipitated crystals were collected by filtration, washed with water, followed by drying to give 0.40 g of 5,6-dimethyl-3-hydroxy-2-(3-pyridyl)isoindolin-1-one.
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