Reaktion #2554

Reaktionsgleichung

4-(4-fluorobenzoyl)-1-(2-hydroxyethyl)piperidine

DMF

thionyl chloride

→

title compound

Ausbeute 96.3%

1-(2-Chloroethyl)-4-(4-fluorobenzoyl)piperidine hydrochloride

Ausbeute 96.3%

Lösungsmittel

methylene chloride

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturwith cooling in an ice bath
2. 2
   Sonstigethe solvent was removed by evaporation
3. 3
   workup.DISTILLATIONthe resulting residue was subjected to azeotropic distillation
4. 4
   WaschenThereafter, the thus obtained residue was washed with an ether-methylene chloride (4:1) mixture solution (30 ml)

Vorschrift

In an atmosphere of dry air, 4-(4-fluorobenzoyl)-1-(2-hydroxyethyl)piperidine (1.96 g, 7.8 mmol) was dissolved in methylene chloride (10 ml) to which, with cooling in an ice bath, were subsequently added dropwise DMF (0.1 ml) and thionyl chloride (2.5 ml, 34.2 mmol). After 7 hours of stirring at room temperature, the solvent was removed by evaporation, and the resulting residue was subjected to azeotropic distillation using benzene (15 ml×2). Thereafter, the thus obtained residue was washed with an ether-methylene chloride (4:1) mixture solution (30 ml) to obtain 2.3 g (96.3%) of the title compound in the form of light beige powder.

Quelle