[C:1]([C:3]1[CH:4]=[N:5][N:6]([CH:20]([CH3:22])[CH3:21])[C:7]=1[NH:8][C:9](=O)[C:10]1[CH:15]=[CH:14][C:13]([N+:16]([O-:18])=[O:17])=[CH:12][CH:11]=1)#[N:2].C([OH:25])C.OO.Cl>[OH-].[Na+]>[CH:20]([N:6]1[C:7]2=[N:8][C:9]([C:10]3[CH:15]=[CH:14][C:13]([N+:16]([O-:18])=[O:17])=[CH:12][CH:11]=3)=[N:2][C:1]([OH:25])=[C:3]2[CH:4]=[N:5]1)([CH3:22])[CH3:21]A suspension of N-(4-cyano-1-isopropyl-1H-pyrazol-5-yl)-4-nitrobenzamide (1.3 g, 4.3 mmol) in 1 M aqueous sodium hydroxide solution (9 mL) was made into a homogeneous mixture by the addition of approximately 40 mL of ethanol. Aqueous hydrogen peroxide solution (30%, 5 mL) was added and the mixture was slowly heated to reflux, at which state it remained overnight. After the mixture was allowed to cool to room temperature, it was treated with concentrated hydrochloric acid (5 mL), precipitating a light yellow solid. The solid was collected via Buchner filtration, washed with water, and dried under house vacuum to provide 1-isopropyl-6-(4-nitrophenyl)-1H-pyrazolo[3,4-d]pyrimidin-4-ol as a pale yellow solid (0.76 g, 58%). MS (ES+): 299.8 (M+H)+
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