Hydrochloric Acid → N-isobutyloxycarbonyl-N-{3-isobutyl-4-[1-methoxy-2,2,2-trifluoro-1-(trifluoromethyl)ethyl]phenyl}-1,3,5-trimethylpyrazole-4-carboxamide

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Reaction Steps

Sodium hydride (29 mg, 60%, 0.73 mmol) was suspended in tetrahydrofuran (10 ml), and a solution of N-{3-isobutyl-4-[1-methoxy-2,2,2-trifluoro-1-(trifluoromethyl)ethyl]phenyl}-1,3,5-trimethylpyrazole-4-carboxamide (260 mg, 0.48 mmol) in tetrahydrofuran (5 ml) was added dropwise. After stirring at room temperature for 30 min, a solution of isobutyl chlorocarbonate (100 mg, 0.73 mmol) in tetrahydrofuran (2 ml) was added, and the mixture was stirred for one day. The reaction mixture was poured into diluted hydrochloric acid and extracted with ethyl acetate. The organic layer was washed with water, dried over magnesium sulfate and concentrated under reduced pressure, and the obtained residue was purified by silica gel column chromatography (hexane:ethyl acetate=1:1) to give the desired compound (280 mg).

Provenance & Evidence