Potassium Carbonate → 4-[4-(6-Fluoro-1,2-benzisoxazol-3-yl)-1-piperidinyl]butyl acetate fumarate

A mixture of 6-fluoro-3-(4-piperidinyl)-1,2-benzisoxazole (9.5 g, 41 mmol), K2CO3 (7.2 g, 51 mmol), and 4-bromobutyl acetate (10 g, 51 mmol) in acetonitrile (200 ml) was heated at reflux for 3.5 hours. At the end of the reaction, the solution was cooled and filtered. The inorganic salt was washed with DCM (50 ml). The organic solvent was removed. The residue was purified on a flash chromatography column (packed with Sorbsil C30 silica gel, 100 g, eluted with DCM, 1 liter, increasing methanol from 2 to 4%, 2.51). The material thus purified weighed 12.92 g (89%). A small sample (1.67 g) was dissolved in ethanol and treated with 1 equivalent of fumaric acid (580 mg) in ethanol to yield white crystals: 1.8 g, m.p.=142°-143° C.

1. temperaturewas heated
2. temperatureat reflux for 3.5 hours
3. customAt the end of the reaction
4. temperaturethe solution was cooled
5. filtrationfiltered
6. washThe inorganic salt was washed with DCM (50 ml)
7. customThe organic solvent was removed
8. customThe residue was purified on a flash chromatography column (packed with Sorbsil C30 silica gel, 100 g, eluted with DCM, 1 liter, increasing methanol from 2 to 4%, 2.51)
9. customThe material thus purified
10. dissolutionA small sample (1.67 g) was dissolved in ethanol
11. customto yield white crystals

ORD record

ord-5873c92b049b4318b833f195e5d9b571

Source dataset

uspto-grants-1997_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05624927