Acetonitrile → Benzyl 2-[4-(tert-butoxycarbonylamino)piperidin-1-yl]ethylcarbamate

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A mixture of phenylmethyl (2-bromoethyl)carbamate (12.9 g, 50 mmol) (prepared from phenylmethyl (2-bromoethyl)carbamate and phenylmethyl chloridocarbonate according to the method of A. J. Brouwer and R. M. J. Liskamp, European Journal of Organic Chemistry (2005), (3), 487-495), 1,1-dimethylethyl 4-piperidinylcarbamate (10 g, 50 mmol), potassium carbonate (6.9 g, 50 mmol), acetonitrile (100 ml) and DMF (30 ml) was heated at 40° C. for 2.5 days. The solvents were decanted from inorganic residues and evaporated. The residue was partitioned between ethyl acetate and dilute brine. The organic extract was dried (MgSO4) and evaporated affording a white solid (17.6 g, 93%).

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