Sodium;3-oxidodioxaborirane;tetrahydrate → 1-(tetrahydro-2H-pyran-2-yl)-3-(trifluoromethyl)-1H-indazol-5-ol

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To a solution of 1-(tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3-(trifluoromethyl)-1H-indazole (415 mg, 1.047 mmol) in THF (4 mL) and water (4.00 mL) was added sodium perborate tetrahydrate (483 mg, 3.14 mmol). The reaction mixture was heated at 50° C. for 2 h. The organic solvents were evaporated, extracted with EtOAc and washed with water and brine solution, then dried over Na2SO4 and concentrated. The crude product was purified by flash chromatography on silica gel using 50% EtOAc/Petroleum Ether to give 1-(tetrahydro-2H-pyran-2-yl)-3-(trifluoromethyl)-1H-indazol-5-ol (255 mg, 85%). 1HNMR 400 MHz, CDCl3: 6 ppm 1.68-1.75 (m, 4H), 2.05-2.17 (m, 2H), 2.46-2.52 (m, 1H), 3.71-3.77 (m, 1H), 3.98-4.01 (m, 1H), 4.89 (s, 1H), 5.74 (dd, J=2.40, 9.00 Hz, 1H), 7.08 (dd, J=2.40, 9.00 Hz, 1H), 7.13 (d, J=0.80 Hz, 1H), 7.59 (d, J=0.40 Hz, 1H).

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