Sodium Iodide → 4-(4-bromo-5-cyano-2-ethyl-2H-pyrazol-3-yl)butyl acetate

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Potassium acetate (1.69 g, 17.2 mmol), sodium iodide (255 mg, 1.7 mmol), and DMF (17 mL) were added to 4-bromo-5-(4-chlorobutyl)-1-ethyl-1H-pyrazole-3-carbonitrile (1.0 g, 3.4 mmol, prepared as described in Parts A-E of Example 19), and the reaction was heated at 100° C. for two hours under a nitrogen atmosphere and allowed to cool to ambient temperature. Water was added, and the resulting mixture was extracted with diethyl ether. The combined extracts were washed with brine, dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by chromatography on a HORIZON HPFC system (40+M cartridge, eluting with hexanes/ethyl acetate in a gradient from 90:10 to 60:40) to provide 0.86 g of 4-(4-bromo-5-cyano-2-ethyl-2H-pyrazol-3-yl)butyl acetate.

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