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A solution comprising 10 g (33.7 mmol) of 1,4-dibenzyl-2-hydroxymethylpiperazine (prepared in accordance with the process described by Jucker and Rissi in Helv. Chem. Acta, 1962, 45, 2383-2402) in 9.5 ml (2.8 equivalents; 94.4 mmol) of triethylamine and 95 ml of dichloromethane (CH2Cl2) is placed in a 500 ml ground-necked conical flask on which is fitted an addition funnel, and is cooled in an ice bath. After dropwise addition of 6.4 g (1.25 equivalents; 42 mmol) of phenyl chlorocarbonate dissolved in 95 ml of CH2Cl2, the mixture is stirred at 0° C. for one hour and then at room temperature for 10 hours. At the end of the reaction, the solution is washed once with saturated sodium bicarbonate (NaHCO3), solution and then with water until a neutral pH is obtained, and it is dried over magnesium sulfate (MgSO4). After filtration on paper and evaporation of the CH2Cl2, the residue is chromatographed on a column of silica gel, using dichloromethane as eluent. 8 g of 1,4-dibenzyl-2-phenoxycarbonyloxymethylpiperazine are thus obtained in the form of a viscous product. Yield: 57%. Rf=0.52 (2/98 v/v MeOH/CH2Cl2,).

1. customprepared in accordance with the process
2. customis fitted an addition funnel
3. temperatureis cooled in an ice bath
4. waitat room temperature for 10 hours
5. customAt the end of the reaction
6. washthe solution is washed once with saturated sodium bicarbonate (NaHCO3), solution
7. customwith water until a neutral pH is obtained
8. dry with materialit is dried over magnesium sulfate (MgSO4)
9. filtrationAfter filtration
10. customon paper and evaporation of the CH2Cl2
11. customthe residue is chromatographed on a column of silica gel