Potassium Carbonate → 4-[3-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)1-piperidinyl]propoxy]-3-methoxybenzamide

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Reaction Steps

A mixture of 6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole (2.2 g, 10.0 mmoles), K2CO3 (2.0 g) and 4-(3-bromopropoxy)-3-methoxybenzamide (2.32 g, 8.0 mmoles) in acetonitrile i80 ml) was heated at reflux for 5 hours. At the end of the reaction the solvent was evaporated. The residue was extracted into dichloromethane. The inorganic insolubles were filtered off. The dichloromethane was concentrated again. The crude residue was purified by flash chromatography over a silica gel column (55 g, SiO2, eluted with 1% methanol in dichloromethane, 1 l; 2% methanol in dichloromethane, 1 l). The material thus obtained weighed 2.93 g (84%) as white crystals. Recrystallization from hot ethanol (60 ml) gave 2.2 g of 4-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propoxy]-3-methoxy-benzamide as white crystals, m.p.=163°-164° C.

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