Methanol → 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylic acid

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Reaction Steps

To a mixture of 1.32 g of methyl 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylate and 15 ml of methanol was added 5 ml of a 2N aqueous sodium hydroxide solution. The resulting mixture was stirred at room temperature for 3 hours. Water was poured into the reaction mixture, and the mixture was washed with methyl tert-butyl ether. The aqueous layer was adjusted to pH 2 by an addition of 6N hydrochloric acid and then extracted with methyl tert-butyl ether two times. The organic layers were combined, washed with an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to obtain 1.18 g of 1-(3-chloro-2-pyridinyl)-3-[1,1,2-trifluoro-2-(trifluoromethoxy)ethoxy]-1H-pyrazole-5-carboxylic acid of the formula:

Provenance & Evidence