Water → (1S*,2R*)-2-[1-(Tetrahydro-2H-pyran-2-yl)-1H-pyrazol-4-yl]cyclohexanol

Participants

Reaction Steps

To a solution of the 4-cyclohex-1-en-1-yl-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazole (775 mg, 3.34 mmol) prepared in Example 33a in THF (4 mL), a borane-THF complex (0.95 M; 3.4 mL, 3.23 mmol) was added with cooling on ice, and the reaction solution was stirred for 30 minutes with cooling on ice. To the reaction solution, a borane-THF complex (0.95 M; 3.4 mL, 3.23 mmol) was added again, and the mixture was stirred at room temperature for 90 minutes. To the reaction solution, water (5 mL) and subsequently sodium perborate tetrahydrate (1.00 g, 6.50 mmol) were added, and the mixture was stirred for 5 hours. To the reaction solution, sodium thiosulfate (2.0 g) was added, followed by extraction with ethyl acetate (50 mL). The thus obtained organic layer was dried over anhydrous sodium sulfate. After vacuum concentration, the residue was purified with column chromatography (dichloromethane/methanol=97:3) to yield the title compound (590 mg, 71%) as a colorless oil.

Provenance & Evidence