Pinacol → 1-Phenyl-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

(1-Phenyl-1H-pyrazol-5-yl)boronic acid (25.0 g) was dissolved in toluene (700 mL), pinacol (18.0 g) was added at room temperature, and the mixture was stirred at 40° C. for 2 days. The reaction mixture was diluted with dichloromethane, washed successively with water and saturated brine, dried over anhydrous sodium sulfate and filtered, and the filtrate was concentrated. The resulting solid was collected by filtration, and washed with hexane to give the title compound (19.8 g).

Provenance & Evidence