Triethylamine → benzyl (3R)-4-(3-cyanophenoxy)-3-[4-(1-t-butoxycarbonyl-4-piperidyloxy)benzoylamino]butyrate

Participants

Reaction Steps

1.46 g (3.56 mmol) of benzyl (3R)-3-(t-butoxycarbonyl)amino-4-(3-cyanophenoxy)butyrate was dissolved in 10 ml of 4 N dioxane hydrochloride and 5 ml of dioxane, and the solution was stirred for 15 hours. The solvent was evaporated, and the residue was dissolved in 20 ml of dichloromethane. 1.14 g (3.56 mmol) of 4-(1-t-butoxycarbonyl-4-piperidyloxy)benzoic acid, 2.48 ml (17.8 mmol) of triethylamine, 748 mg (3.92 mmol) of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and 529 mg (3.92 mmol) of 1-hydroxybenzotriazole were added to the solution, and they were stirred for 16 hours. The reaction liquid was diluted with water. After the extraction with ethyl acetate, the organic layer was successively washed with water, 1 N sodium hydroxide and saturated aqueous NaCl solution, and then dried over anhydrous magnesium sulfate. The solvent was evaporated, and the residue was treated by the silica gel column chromatography to obtain the title compound.

Provenance & Evidence