Chloroacetyl chloride → 1-(2-Chloroacetyl)piperidine-4-carbonitrile

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 4-piperidinecarbonitrile (200 g, 1.80 mol) and 40% aqueous potassium carbonate solution (342 g, 0.99 mol) in dichloromethane (1 L) was cooled to −10° C., and a solution of chloroacetyl chloride (210 g, 1.86 mol) in dichloromethane (300 mL) was added over about 75 minutes while maintaining the reaction mixture at −10 to 0° C. After the addition was complete, the reaction mixture was separated, the upper aqueous phase was extracted with dichloromethane (2×300 mL), and the combined organic phases were concentrated under reduced pressure to give 312 g of the title compound as a liquid which slowly crystallized on standing. This compound was of sufficient purity to use in subsequent reactions.

Herkunft & Nachweise