Hydrochloric Acid → 1-(N-benzyloxycarbonyl-2(S)-aminobutyryl)-L-proline

Participants

Reaction Steps

A solution of 2.1395 g of L-proline (18.6 mmol) and 1.56 g of NaHCO3 (18.6 mmol) in water (20 ml) is treated with a solution of 4.138 g of the succinimide ester of N-benzyloxycarbonyl-2(S)-aminobutyric acid (12.4 mmol) prepared as in Example 3 b), in dimethoxyethane (25 ml). After 5 hours, 12.4 ml of water are added, the resulting mixture is acidified to pH=2 with concentrated HCl and is extracted with ethyl acetate. The extracts are dried and are evaporated, which leads to a syrup.

Provenance & Evidence