Ethyl bromoacetate → ethyl 5-chloro-3-(trifluoromethyl)-1H-pyrazole-1-acetate

Participants

Reaction Steps

To a suspension of 5-chloro-3-(trifluoromethyl)-1H-pyrazole (i.e. the product of Example 10, Step C) (2.1 g, 12.3 mmol) and potassium carbonate (3.6 g, 26.0 mmol) in 20 mL of N,N-dimethylformamide was added ethyl bromoacetate (2.1 mL, 18.8 mmol), and the resulting mixture was stirred at room temperature for 12 h. The resulting mixture was diluted with ethyl acetate, washed with water, and dried (MgSO4). The reaction mixture was concentrated under reduced pressure and further purified by medium-pressure liquid chromatography using 0-50% of ethyl acetate in hexanes as eluant to give 940 mg of the title compound as an oil.

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