Chloroacetonitrile → 6-Fluoro-3-(1-cyanomethyl-4-piperidyl)-1,2-benzisoxazole

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Reaktionsschritte

A mixture of 4-(6-fluoro-1,2-benzisoxazol-3-yl)piperidine (11 g, 50 mmol), K2CO3 (8.5 g, 61.6 mmol) and 2-chloroacetonitrile (5.5 g, 73 mmol) in acetonitrile (250 ml) was heated at reflux for 24 hours. The insolubles were filtered off and rinsed with methylene chloride (DCM). During concentration of the solvents on the rotary evaporator, crystals appeared. The crystals were collected and weighed 5.79 g. The product in the mother liquor was further purified by flash chromatography over a silica gel column (SiO2, 70 g; eluted with DCM, and 1% CH3OH in DCM). The second crop of product thus obtained weighed 5.2 g. The total yield was 10.9 g. The sample was recrystallized once more form ethanol, m.p. 130°-132° C.

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