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A solution of HCl in dioxane (4N, 5 mL) was added to tert-butyl 4-[3-(acetylamino)phenyl]-1-piperidinecarboxylate (660 mg) in dry dichloromethane (15 mL). The reaction mixture was stirred at room temperature overnight and concentrated in vacuo, giving the desired product (550 mg): mp 102–104° C.; 1H NMR (CDCl3) δ 2.02 (d, J=13.2 Hz, 2H), 2.11–2.45 (m, 5H), 2.67–2.77 (m, 1H), 3.00–3.10 (m, 2H), 3.51 (d, J=10.5 Hz, 2H), 6.94 (d, J=7.5 Hz, 1H), 7.20–7.46 (m, 3H), 7.60 (s, 1H); Anal. Calcd. For C13H19N2OCl+0.86 CH2Cl2: C, 50.78; H, 6.37; N, 8.55. Found: C, 50.80; H, 7.55; N, 7.01.

1. concentrationconcentrated in vacuo