To a solution consisting of 5-(3-chloropropyl)-6,7-dihydro-3-methyl-1,2-benzisoxazol-4(5H)-one (0.85 g) and DMF (20 ml) was added anhydrous potassium carbonate (0.52 g) diisopropylethyl amine (0.33 ml), 4-(4-fluorobenzoyl)piperidine (0.92 g) and potassium iodide (62 mg) at room temperature with stirring. The flask was flushed with nitrogen and warmed to 80° C. for 24 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 3 times with ethyl acetate. The combined organic layers were washed with water twice, then brine. The organic phase was then dried (MgSO4), filtered, and concentrated to give the crude product. Purification via flash column chromatography (silica gel, 2% triethylamine/ether) afforded 0.70 g of 6,7-dihydro-5-[3-(4-(4-fluorobenzoyl)-1-piperidinyl)-propyl]-3-methyl -1,2-benzisoxazol-4(5H)-one as an oil which solidified on standing. The product was dissolved and flushed through alumina with dichloromethane. Recrystallization with ether/hexane gave the product as a solid, m.p. 81°-83° C.
