Water → 1-Aminocarbonyl-4-(2,3,4,5,6-pentafluorophenoxy)piperidine

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A solution of 4.0 g of 4-(2,3,4,5,6-pentafluorophenoxy)piperidine in 100 ml of 95% ethanol was treated with 1.73 g of nitrourea and then stirred at 65° C. for five hours. After cooling to room temperature, the reaction mixture was poured into water and extracted with ethyl acetate. The organic layer was washed with water followed by a saturated sodium chloride solution and dried over anhydrous magnesium sulfate. Filtration, followed by evaporation of the solvents afforded a residue which was purified by means of high pressure liquid chromatography (silica gel; elution with 5% methanol/dichloromethane). The resultant solid was recrystallized from hot isopropanol to yield 3.41 g (73.3%) of 1-aminocarbonyl-4-(2,3,4,5,6-pentafluorophenoxy)piperidine, m.p. 170°-172° C.

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