Hydrochloric Acid → 5-(4-chlorophenyl)-N-(2-cyclohexyl-2-oxoethyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxamide

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Reaction Steps

To a tert-butyl 2-cyclohexyl-2-oxoethylcarbamate (228 mg, 0.946 mmol) in DCM (5 mL) was added 4M HCl in 1,4-dioxane (5 mL) at room temperature. The reaction continued for an hour at room temperature. The volatiles were removed under vacuum. To the residue (2-amino-1-cyclohexylethanone hydrochloric acid), 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboxylic acid (361 mg, 0.946 mmol), EDCI (272 mg, 1.429 mmol), HOBt (192 mg, 1.429 mmol) in DMF (9 mL) was added NMM (1.0 mL, 9.46 mmol) at room temperature. The reaction mixture was stirred at room temperature overnight. The residue was purified by reverse-phase prep HPLC to afford the title compound (232 mg, 49%).

Provenance & Evidence