Hydrogen Peroxide → 1-[[2-(Trimethylsilyl)ethoxy]methyl]-1H-pyrazol-4-ol

Participants

Reaction Steps

To a solution of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1-((2-(trimethylsilyl)ethoxy)methyl)-1H-pyrazole (compound 280.1, 9.7 g, 30.0 mmol) in THF (100 mL) was added 2M sodium hydroxide (aq.) (30 mL) dropwise. To this was added H2O2 (30%) (22.7 mL) dropwise at 0° C. The reaction mixture was stirred for 2 h at room temperature, then quenched with 50 mL of water. The aqueous phase was extracted with 2×150 mL of ethyl acetate and the combined organic layers were dried over anhydrous sodium sulfate and concentrated under reduced pressure. This resulted in 4.3 g (67%) of the title compound as a white solid.

Provenance & Evidence