Potassium Carbonate → 1-[3,5-Dibromo-4-[3-[4-(6-fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]propoxy]phenyl]ethanone

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Reaction Steps

A stirred mixture of 6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole (2.0 g, 9.0 mmol). K2CO3 (1.3 g), and 1-[4-(3-bromopropoxy)-3,5-dibromophenyl]ethanone (2.65 g, 9.0 mmol) and acetonitrile (50 ml) was heated at reflux for 3 hours. At the end of the reaction, the solvent was evaporated and the residue wax extracted into dichloromethane (150 ml). The insolubles were filtered off. -De dichloromethane solution was concentrated down to an oil. The purification was done by flash chromatography on a silica gel column (SiO2, 47 g: eluted with dichloromethane, 300 ml; 1% methanol in dichloromethane, 600 ml). The material thus purified as a colorless oil, solidified on standing. Recrystallization from ethanol gave 1-[3,5-dibromo-4-[3-[4-(6-fluoro-1,2- benzisoxazol-3-yl)-1-piperidinyl]propoxy]phenyl]ethanone as white crystals (2.93 g, 57%), m.p.=102°-10 3° C.

Provenance & Evidence