反应详情

A solution of 20.1 g (0.1 m) of gamma-chloro-p-fluorobutyrophenone, 30 g (0.2 m) of 4-methyl-4-methoxy-piperidine and 0.1 g. of potassium iodide in 150 ml of toluene is heated in a glass autoclave for 15 hours at 100°-110° C. The KI and the 4-methyl-4-methoxy-piperidine hydrochloride formed in the reaction are separated by filtration and the solvent removed from the filtrate by evaporation under a vacuum on a steam bath. The obtained base is dissolved in ether and the hydrochloride is precipitated with alcoholic HCl. The reaction product is purified by recrystallization from ethanol-ether. Yield 22 g. Melting point 182° C.