Potassium Iodide → 3-(1-Allyl-4-piperidyl)-6-chloro-1,2-benzisoxazole hydrochloride

Participants

Reaction Steps

A suspension of 3.55 g of 3-(4-piperidyl)-6-chloro-1,2-benzisoxazole, 2.0 g of allyl bromide, 2.0 g of potassium carbonate and some crystals of potassium iodide in 47 ml of dimethylformamide was stirred under nitrogen at 85°-90° for 5 hrs. The reaction mixture was cooled and filtered. The crystals were washed with dichloromethane. The combined organic solvents (dimethylformamide+dichloromethane) were distilled in vacuo and to the residue was added with 30 ml ethanol and 500 ml half-saturated sodium chloride, prepared by diluting saturated sodium chloride with an equal volume of water. After 16 hrs, the crystals were filtered, washed with water and dried, yielding base. The base was dissolved in 50 ml of ethanol and 1.2 ml of conc hydrochloric acid. The mixture was heated to 50°. The solvents were evaporated in vacuo. Benzene (60 ml) was added and distilled in vacuo. The residue was triturated with ether, filtered and twice recrystallized from isopropanol-ether, giving 3.0 g (63.9%) of product as the hydrochloride, mp, 178°-180°.

Provenance & Evidence