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0.50 g (2.3 mmol) of t-butyl 3-amino-4-hydroxypiperidin-1-carboxylate (product of PREPARATION 83) and 0.32 mL, (2.3 mmol) of triethylamine was dissolved in 30 mL of methylene chloride, and 0.34 mL, (2.3 mmol) of 4-trifluoromethyl benzylchloride was dropwise added thereto while stirring at 0° C. for 1 hour, followed by addition of 100 mL of ethylacetoacetate and then washing with water. An organic layer dried over anhydrous magnesium sulfate. The reaction solution was filtered off and distilled off under reduced pressure, then the residue was purified by column chromatography to give 0.48 g (1.2 mmol) of the title compound in a total yield of 54%.

1. washwashing with water
2. dry with materialAn organic layer dried over anhydrous magnesium sulfate
3. filtrationThe reaction solution was filtered off
4. distillationdistilled off under reduced pressure
5. customthe residue was purified by column chromatography