Oxalyl chloride → 1-(3,5-dichloropyridin-2-yl)-3-(trifluoromethyl)-1H-pyrazole-5-carbonyl chloride

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Reaction Steps

To a 100 mL flask, 1-(3,5-dichloropyridin-2-yl)-3-(trifluoromethyl)-1H-pyrazole-5-carboxylic acid (0.40 g, 1.22 mmol), dichloromethane (10 mL) and oxalyl dichloride (0.31 g, 2.44 mmol) were added sequentially. After five drops of N,N-dimethyl formamide were added, a large amount of gas was released. After being stirred for 8 hours at room temperature, the reaction mixture was concentrated under reduced pressure. Then toluene (30 mL) was added, and was concentrated again under vacuum to give the product (0.42 g) as yellow solid in 100% yield.

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