Water → 2-Chloro-1-[4-[4-[5-(2,6-difluorophenyl)-4,5-dihydro-3-isoxazolyl]-2-thiazolyl]-1-piperidinyl]ethanone

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Reaction Steps

To a mixture of 4-[4-[5-(2,6-difluorophenyl)-4,5-dihydro-3-isoxazolyl]-2-thiazolyl]piperidine (i.e. the product of Example 1, Step D) (4.2 g, 12.0 mmol) and N,N-diisopropylethylamine (1.63 g, 12.6 mmol) in methylene chloride (25 mL) at 0° C. was added a solution of 2-chloroacetyl chloride (1.43 g, 1.26 mmol) in dichloromethane (3 mL), after which time the reaction mixture was allowed to warm to room temperature. After 4 h, the reaction mixture was poured into water and the layers were separated. The organic layer was washed with aqueous hydrochloric acid solution (1 N), saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, dried over magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by medium pressure liquid chromatography on silica gel (0 to 100% gradient of ethyl acetate in hexanes as eluant) to provide the title compound as a tan solid (2.8 g).

Provenance & Evidence