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0 °C

The title compound 4-(1H-pyrazolo[3,4-d]-pyrimidin-1-yl)phenol (22) was prepared by the following procedure: To a solution of 1-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)-1H-pyrazolo[3,4-d]pyrimidine (22C) (100 mg, 0.31 mmol) in THF (5 mL) was added NaOH (0.248 mL, 0.621 mmol) and hydrogen peroxide (0.048 mL, 0.466 mmol). The mixture was stirred at 0° C. for 30 minutes The reaction mixture was concentrated and the residue was dissolved water (8 mL). The aqueous solution was acidified with diluted HCl. The white precipitate was collected, washed with water and dried to provide the title compound 4-(1H-pyrazolo[3,4-d]pyrimidin-1-yl)phenol (22): 1H NMR (400 MHz, DMSO-D6) δ ppm 9.75 (1H, s), 9.44 (1H, s), 9.09 (1H, s), 8.59 (1H, s), 7.82-7.99 (2H, m), 6.83-7.05 (2H, m).

1. customThe title compound 4-(1H-pyrazolo[3,4-d]-pyrimidin-1-yl)phenol (22) was prepared by the following procedure
2. concentrationwas concentrated
3. dissolutionthe residue was dissolved water (8 mL)
4. customThe white precipitate was collected
5. washwashed with water
6. customdried