Hydrochloric Acid → 4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl-2-propanone hydrochloride

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Reaction Steps

A mixture of 4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (7.45 g, 33.4 mmol), K2CO3 (5.5 g) and bromo-2,2-dimethoxypropane (6.84 g, 37.6 mmol) in acetonitrile (200 ml) was heated and stirred at reflux for 4 hours. An additional charge of bromo-2,2-dimethoxypropane (5.1 g, 28 mmol) was added and the mixture was refluxed overnight. After being cooled to room temperature, the mixture was filtered, and the solvent was removed on a rotary evaporator. The residue was purified by flash chromatography over a silica gel column (SiO2, 100 g; eluted with dichloromethane, DCM, and 1%CH3OH in DCM). The oil product thus obtained weighed 2.2 g (24%). The oil product was dissolved into ethanol (10 ml) then was treated with HCl in ether solution (1M, 9 ml) at room temperature. The crystals were collected, 2.08 g, m.p.=220°-223° C. dec.

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