1-Hydroxybenzotriazole → ethyl (3R)-1-(4-((4,4,4-trifluoro-1-(2-methyl-4-(5-(trifluoromethyl)pyridin-2-yl)phenyl)butyl)amino)benzoyl)piperidine-3-carboxylate

Participants

Reaction Steps

A solution of 4-((4,4,4-trifluoro-1-(2-methyl-4-(5-(trifluoromethyl)pyridin-2-yl)phenyl)butyl)amino)benzoic acid obtained in step H, ethyl (3R)-piperidine-3-carboxylate (5.05 mL), 1-hydroxybenzotriazole (4.43 g), 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride (6.28 g), diisopropylethylamine (5.72 mL) in dimethylformamide (91 mL) was stirred at room temperature overnight. The reaction mixture was added to water, and the mixture was extracted with ethyl acetate. The extract was washed with water and saturated brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (hexane/ethyl acetate) to give the title compound (15.9 g).

Provenance & Evidence