To a solution consisting of 5-(3-chloropropyl)-3-(2-fluorophenyl)-6,7-dihydro-1,2-benzisoxazol-4(5H)-one (1.36 g) and DMF (40 ml) was added anhydrous potassium carbonate (0.3 g), diisopropylethyl amine (0.8 ml), 3-piperazinyl-1,2-benzisothiazol (1.26 g) and potassium iodide (27 mg) at room temperature with stirring. The flask was flushed with nitrogen and warmed to 80° C. for 12 hours. Upon cooling to room temperature, water and ethyl acetate were added to the reaction mixture. The layers were separated and the aqueous phase was extracted three times with ethyl acetate. The combined organic layers were washed with brine and dried (MgSO4). Filtration and concentration gave the crude product. Purification via flash column chromatography (silica gel, 20% triethylamine/ether) afforded 1.0 g of 5-[3-[4-(1,2-benzisothiazol-3-yl)-1-piperazinyl]propyl]-3-(2-fluorophenyl)-6,7-dihydro-1,2-benzisoxazol-4(5H)-one as a foam. The product was flushed through alumina with dichloromethane. The hydrochloride was prepared by dissolving the free amine with menthanol and adding ethereal HCl. The salt was filtered and washed with pentane, m.p. 215° C. (dec.).
