Sodium Azide → trans-{3-Azidomethyl-1-[2-(4-fluoro-phenyl)-ethyl]-piperidin-4-yl}-benzyl-methylamine

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A mixture of crude methanesulfonic acid trans-4-(benzyl-methyl-amino)-1-[2-(4-fluorophenyl)-ethyl]-piperidin-3-ylmethyl ester (139 mg, 294 μmol) and sodium azide (58 mg, 882 μmol) in N,N-dimethylformamide (2 mL) was heated at 60° C. for 20 hours, then cooled to room temperature. The mixture was diluted with ethyl acetate, washed three times with water, dried over sodium sulfate, and concentrated under vacuum to provide a gum (106 mg, 95%) which was used without purification. 1H NMR (300 MHz, CDCl3) δ7.33 (m, 5H), 7.16 (m, 2H), 6.99 (t, J=9 Hz, 2H), 3.70 (m, 2H), 3.52 (d, J=13 Hz, 1H), 3.41 (m, 1H), 3.20 (m, 2H), 2.83 (m, 2H), 2.61 (m, 2H), 2.42 (m, 1H), 2.3-1.8 (m, 4H), 2.19 (s, 3H), 1.75 (m, 1H).

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