Hydrochloric Acid → (R)-1-[4-(3-Fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid methoxy-methyl-amide

Participants

Reaction Conditions

Reaction Steps

(R)-1-[4-(3-Fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidine-3-carboxylic acid (0.200 g, 0.001 mol) was dissolved in dry N,N-dimethylformamide (1 ml) under argon and the solution cooled to 0° C. 1,1′-Carbonyl-diimidazole (0.108 g, 0.001 mol) was added to the mixture and the reaction stirred for one hour while the temperature rose from 0° C. to room temperature. After the addition of N,O-dimethylhydroxylamine hydrochloride (0.063 g, 0.001 mol) and pyridine (0.053 ml, 0.001 mmol), the reaction was stirred for two hours at room temperature. Water (10 ml) and hydrochloric acid (0.1 N) was added and the mixture extracted with ethyl acetate. The organic phase was washed with a solution of sodium carbonate (1 M) and extracted again with ethyl acetate to yield 0.225 g (99% of theory). The crude product obtained in this way was used in the next step without further purification. MS: m/e=373.4(M+H)+.

Provenance & Evidence