反应详情

A mixture of 6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole (2.2 g, 10.0 mmol), K2CO3 (2.0 g) and 4-(3bromopropoxy)-3-methoxybenzamide (2.32 g, 8.0 mmol) in acetonitrile (80 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-methoxybenzamide as white crystals, m.p.=163-164° C.

1. temperaturewas heated
2. temperatureat reflux for 5 hours
3. customAt the end of the reaction the solvent
4. customwas evaporated
5. extractionThe residue was extracted into dichloromethane
6. filtrationThe inorganic insolubles were filtered off
7. concentrationThe dichloromethane was concentrated again
8. customThe 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)
9. customThe material thus obtained
10. customRecrystallization from hot ethanol (60 ml)