Triethylamine → (S)-Methyl 1-((S)-2-(((benzyloxy)carbonyl)amino)-3-methylbutanoyl)pyrrolidine-2-carboxylate

Participants

Reaction Steps

To a solution of N-Cbz-valine (2.5 g, 10 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide (1.6 g, 11 mmol) and triethylamine (2.0 g, 20 mmol) in DMF (10 mL) is added dropwise a solution of proline methyl ester hydrochloride (1.8 g, 11 mmol) in DMF (5 mL). The solution is stirred at room temperature and the reaction monitored by TLC until the disappearance of N-Cbz-valine. The reaction solution is then diluted with dichloromethane (30 mL) and the organic layer is extracted with 0.1 N HCl (20 mL), water (20 mL), then dried over Na2SO4. The solvent is removed in vacuo to afford the desired compound.

Provenance & Evidence