1-Bromo-2-Chloroethane → 4-Bromo-1-(2-chloroethyl)-1H-pyrazole

Participants

Reaction Conditions

Reaction Steps

4-bromopyrazole (700 mg, 4.76 mmol, available from Aldrich), cesium carbonate (2328 mg, 7.14 mmol) and 1-bromo-2-chloroethane (0.592 ml, 7.14 mmol, available from Acros) were suspended in N,N-Dimethylformamide (DMF) (14 ml) and heated to 60° C. under microwave conditions in an Emrys Optimiser for 1 hour. The mixture was partitioned between water (20 ml) and ethyl acetate (60 ml). The aqueous layer was run off and the organic washed (water 3×10 ml), brine (10 ml)), dried (magnesium sulfate) and evaporated to dryness to give the desired product (868 mg).

Provenance & Evidence