Potassium Carbonate → ethyl 5-bromo-3-(trifluoromethyl)-1H-pyrazole-1-acetate

Participants

Reaction Conditions

Reaction Steps

A suspension of 5-bromo-3-(trifluoromethyl)-1H-pyrazole (i.e. the product of Example 11, Step B) (2.73 g, 12.7 mmol) and potassium carbonate (2.0 g, 14.5 mmol) in N,N-dimethylformamide (20 mL) was treated with ethyl iodoacetate (3.0 ml, 25.3 mmol), and the resulting mixture was stirred at 95° C. for 3 h. The resulting mixture was diluted with ethyl acetate, washed with water, and dried (MgSO4). The reaction mixture was concentrated in vacuo and further purified by medium-pressure liquid chromatography using 0-50% of ethyl acetate in hexanes as eluant to give 2.84 g of the title compound as a brown oil.

Provenance & Evidence