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

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Reaction Steps

To a 100 mL flask, 1-(3,5-dichloropyridin-2-yl)-3-(prop-2-ynyloxy)-1H-pyrazole-5-carboxylic acid (0.2 g, 0.64 mmol), dichloromethane (10 mL) and oxalyl dichloride (0.16 g, 1.2 mmol) were added. After five drops of N,N-dimethyl formamide were added, a large number of gas was released. After being stirred for 8 hours at room temperature, the reaction mixture was evaporated to dryness at reduced pressure. Then 100 mL toluene was added, and the reaction mixture was concentrated again under reduced pressure to give the product (0.21 g) as yellow solid in 100% yield.

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