Methyl iodide → 1-[(4-{3-[2-(5-methyl-4H-1,2,4-triazol-3-yl)ethyl]-5-(trifluoromethyl)phenyl}-1,3-thiazol-2-yl)methyl]-1H-pyrazole-4-carboxylic acid

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Reaction Steps

To a solution (3 mL) of the compound (300 mg, 0.64 mmol) obtained in Example 96c in acetone was added iodomethane (0.20 mL, 3.2 mmol), and the mixture was stirred at room temperature overnight. The solvent was evaporated under reduced pressure, and to a solution (4 mL) of the residue in ethanol was added acetylhydrazine (240 mg, 3.2 mmol), and the mixture was stirred at 80° C. for 6 hr. The solvent was evaporated under reduced pressure, and a solution (6 mL) of the residue in xylene was stirred at 150° C. overnight. The solvent was evaporated under reduced pressure, and to an ethanol/tetrahydrofuran mixed solution (v/v=1/1, 4 mL) of the residue was added 2N aqueous sodium hydroxide solution (0.45 mL, 0.91 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. The obtained aqueous layer was neutralized with 1N hydrochloric acid, 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 purified by HPLC and recrystallization (hexane-ethyl acetate) to give the title compound (2 mg, 0.7%) as colorless crystals.

Provenance & Evidence