Hydrochloric Acid → (R)-1-[4-(4-fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid

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A solution of 1.27 g (3.7 mmol) of (R)-1-[4-(4-fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid methyl ester in 77 ml of dioxane is treated with 8.64 ml of hydrochloric acid (37%). The mixture is heated at 52° C. for 18 h in a closed flask. For the working-up, the solution is evaporated under reduced pressure to yield the crude acid as a yellowish solid. For purification, the crude acid is triturated at −5° C. in 10 ml of ethyl acetate. The solid is collected on a filter funnel and then dried under high vacuum to yield 0.624 g (51% of theory) of (R)-1-[4-(4-fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid as a white solid; MS: m/e=330 (M+H)+.

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