Triethylamine → HCID 58375893, compound

Participants

Reaction Steps

To a solution of [(2R,5R)-5-[[(benzyloxy)carbonyl](isopropyl)amino]-1-(tert-butoxycarbonyl)-piperidin-2-yl]acetic acid (8.0 g) in tetrahydrofuran (100 mL) was added triethylamine (7.7 mL), and thereto was added ethyl chloroformate (3.5 mL) under ice-cooling. After the mixture was stirred under ice-cooling for one hour, the insoluble materials were removed by filtration. To the filtrate was added dropwise a solution of sodium borohydride (3.5 g) in water (30 mL) under ice-cooling with stirring. Then, the mixture was stirred at room temperature for one hour. To the mixture was added an aqueous potassium hydrogen sulfate solution under ice-cooling, the mixture was extracted with ethyl acetate. The organic layer was washed with a saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel chromatography to give the title compound (6.7 g) as a colorless oil.

Provenance & Evidence