Phosphorus tribromide → 3-(bromomethyl)-4-chloro-1-methyl-1H-pyrazole

Participants

Reaction Steps

To a solution of (4-chloro-1-methyl-1H-pyrazol-3-yl)methanol (680 mg, 4.7 mmol) in anhydrous dichloromethane (25 mL) was added dropwise a solution of tribromophosphane (450 μL, 4.7 mmol) in anhydrous dichloromethane (5 mL) at 0° C. The mixture was stirred for 1 hour at room temperature and then was evaporated to yield 3-(bromomethyl)-4-chloro-1-methyl-1H-pyrazole, which was used in the next step without further purification.

Provenance & Evidence