Ethyl 4,4,4-trifluoroacetoacetate → HCID 178516595, compound

Participants

Reaction Conditions

Reaction Steps

Ethyl trifluoroacetoacetate (1.50 g, 8.15 mmol) was added to a solution of 3-{1-[5-(trifluoromethyl)pyridin-2-yl]piperidin-4-yl}-1H-pyrazol-5-amine (880 mg, 2.83 mmol) produced in Reference Example 10 in acetic acid (10 mL), and the mixture was stirred at 60° C. for 2 hours. A saturated sodium bicarbonate aqueous solution was added to the reaction solution, followed by extraction with ethyl acetate three times. The obtained organic layer was washed with brine and dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The obtained residue was purified by silica gel column chromatography [NH-silica gel column, elute: ethyl acetate/methanol=100/0-96/4 (gradient)] and further purified by silica gel column chromatography [elute: hexane/ethyl acetate=60/40-0/100 (gradient)] to obtain the title compound (610 mg, yield: 48%).

Provenance & Evidence