Triethylamine → HCID 68741257, compound

Participants

Reaction Conditions

Reaction Steps

A suspension of 2-benzyloxycarbonylamino-2-methyl-propionic acid (2.37 g), 1-isopropylpiperazine (1.54 g), 1-hydroxybenzotriazole (1.49 g), 1-ethyl-3-(3-dimethyl-aminopropyl)carbodiimide hydrochloride (2.88 g) and triethylamine (2.79 mL) in N,N-dimethylformamide (20 mL) was stirred at 50° C. overnight. The reaction mixture was poured into water, and the resulting mixture was extracted with ethyl acetate. The extract was washed with water, a saturated aqueous ammonium chloride solution, water, 0.5 mol/L aqueous sodium hydroxide solution, water and brine successively, and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure. The residue was washed with a mixed solvent of n-hexane and ethyl acetate (2/1), and dried under reduced pressure to give 1-(2-benzyloxycarbonylamino-2-methylpropionyl)-4-isopropyl-piperazine (1.83 g). This material was dissolved in methanol (20 mL). To the solution was added 10% palladium-carbon powder (0.60 g), and the mixture was stirred at room temperature under a hydrogen atmosphere for 3 hours. The insoluble material was removed by filtration, and the solvent was removed under reduced pressure. The residue was crystallized from a mixed solvent of n-hexane and ethyl acetate, and the crystals were collected by filtration. The crystals were washed with n-hexane, and dried under reduced pressure to give the title compound (0.76 g).

Provenance & Evidence