Triethylamine → 2-[5-Bromo-3-(trifluoromethyl)-1h-pyrazol-1-yl]-1-[4-[4-(4,5-dihydro-5-phenyl-3-isoxazolyl)-2-thiazolyl]-1-piperidinyl]ethanone

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Reaction Steps

To a solution of 5-bromo-3-(trifluoromethyl)-1H-pyrazole-1-acetic acid (i.e. the product of Example 11, Step D) (0.12 g, 0.61 mmol) in dichloromethane (5 mL) was added N,N-dimethylformamide (1 drop) followed by oxalyl chloride (0.25 mL, 2.86 mmol). The reaction mixture was stirred at room temperature for 1 h and then concentrated under reduced pressure. The residue containing crude acid chloride was taken up in dichloromethane (5 mL), and the solution was added dropwise to a mixture of 4-[4-(4,5-dihydro-5-phenyl-3-isoxazolyl)-2-thiazolyl]-1-piperidine hydrochloride (i.e. the intermediate product of Example 10, Step F) (0.15 g, 0.43 mmol) and triethylamine (0.25 mL, 1.8 mmol) in dichloromethane (5 mL) at 0° C. The reaction mixture was allowed to warm to room temperature, and then stirred overnight at room temperature. The mixture was then partitioned between 1.0 N aqueous hydrochloric acid solution and dichloromethane. The organic layer was washed with water, dried (MgSO4), concentrated under reduced pressure, and purified by medium-pressure liquid chromatography using ethyl acetate in hexanes as eluant to give 90 mg of the title product, a compound of the present invention, as an amorphous solid.

Provenance & Evidence