Acetyl chloride → Sembragiline

Participants

Reaction Conditions

Reaction Steps

A suspension of 11.3 mmol of (S)-4-amino-1-[4-(3-fluoro-benzyloxy)-phenyl]-pyrrolidin-2-one hydrochloride in 86 ml of dichloromethane was treated with 23.8 mmol of triethylamine and cooled to 0° C. To this solution, 12.5 mmol of acetylchloride were added and stirring at 0° C. was continued for 15 min. For the working-up, the reaction mixture was extracted twice with 100 ml of water. The organic layer was separated, dried over sodium sulfate and evaporated under reduced pressure. The crude product was triturated in 100 ml of toluene, then the solid collected on a filter funnel. In a second step, the product was triturated in 200 ml of tert-butylmethylether at RT. Again, the solid product was collected on a filter funnel and dried under high vacuum. There was obtained (S)-N-{1-[4-(3-fluoro-benzyloxy)-phenyl]-5-oxo-pyrrolidin-3-yl}-acetamide as a white solid. MS: m/e=343 (M+H)+; enantiomeric excess: >99.5%.

Provenance & Evidence