反应详情

温度

-20 °C

Into a 2 L, four-necked RB flask was charged 1250 ml of ethyl acetate and 25 g of N-acetyl-O-methyl-D-serine under nitrogen atmosphere. The reaction mass was cooled to −20° C. and added 16.5 g of N-methylmorpholine. Isobutyl chloroformate (22.3 g) was slowly added to the reaction mass. After stirring for 30 min benzylamine (17.5 g) was slowly added to the reaction mass and stirred for 30 min. Temperature of the reaction mass was raised to 25-30° C. and stirred for 1 h. Reaction mass was quenched with 100 ml of 1N HCl and transferred into a separating funnel. Organic layer was washed with brine and dried over sodium sulphate. Solvent was partially distilled of from the mass under vacuum. The residue was kept under stirring and filtered the solid. The wet solid was recrystallized from ethyl acetate to get 35 g of pharma grade lacosamide. Chiral HPLC purity is >99.9% and the related impurities are <0.5%.

1. additionwas slowly added to the reaction mass
2. temperatureTemperature of the reaction mass was raised to 25-30° C.
3. stirringstirred for 1 h
4. customReaction mass
5. customwas quenched with 100 ml of 1N HCl
6. customtransferred into a separating funnel
7. washOrganic layer was washed with brine
8. dry with materialdried over sodium sulphate
9. distillationSolvent was partially distilled of from the mass under vacuum
10. stirringunder stirring
11. filtrationfiltered the solid
12. customThe wet solid was recrystallized from ethyl acetate