Methanol → 4-Hydroxy-L-proline methyl ester hydrochloride

Participants

Reaction Steps

To a solution of (2S,4R)-4-hydroxy-2-pyrrolidinecarboxylic acid hydrochloride (1.0 g, 7.6 mmol) in methanol (25 mL) at 0° C. was added thionyl chloride (0.83 mL, 11.4 mmol). The reaction was warmed to room temperature and heated at reflux overnight. After cooling to room temperature, the reaction mixture was concentrated to dryness to give the title compound (1.2 g, 92%) as a white solid.

Provenance & Evidence