Hydrogen chloride-ethyl acetate → Hydrochloric Acid

Participants

Reaction Steps

A solution of (S)-benzyl 2-((S)-2-((tert-butoxycarbonyl)amino)propanamido)-3-(4-methoxyphenyl)propanoate (29.0 g, 63.6 mmol) in 3 N HCl-EtOAc (150 mL) was stirred for 1 h at ambient temperature. The mixture was concentrated and the residue was washed with petroleum ether (100 mL) to afford (S)-benzyl 2-((S)-2-aminopropanamido)-3-(4-methoxyphenyl)propanoate as an HCl salt (quant.), which was used directly in the next step without further purification.

Provenance & Evidence