Water → 1-({4-[4-chloro-3-(trifluoromethyl)phenyl]-1,3-thiazol-2-yl}methyl)-1H-pyrazole-4-carboxylic acid

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Reaction Steps

To a mixed solution of the compound (270 mg, 0.66 mmol) obtained in Example 40a in ethanol/tetrahydrofuran (v/v=1/1, 8 ml) was added 2N aqueous sodium hydroxide solution (2.0 mL, 4.0 mmol), and the mixture was stirred at room temperature overnight. Water was added to the reaction mixture, and the aqueous layer was washed with diethyl ether, neutralized with 1N aqueous hydrochloric acid solution, and the mixture was extracted with ethyl acetate. The obtained organic layer was washed with saturated brine, and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure. The resulting crude title compound was recrystallized (ethanol-hexane) to give the title compound (67 mg, 18%) as pale-yellow crystals.

Provenance & Evidence