[CH:1]1([CH2:7][N:8](C)[C:9](=O)OC(C)(C)C)[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1.[ClH:17].C(OCC)(=O)C>C(OCC)(=O)C>[ClH:17].[CH:1]1([CH2:7][NH:8][CH3:9])[CH2:6][CH2:5][CH2:4][CH2:3][CH2:2]1To a solution of tert-butyl N-(cyclohexylmethyl)-N-methylcarbamate (370 mg, 1.6 mmol) in 4.0 mL of ethyl acetate was added 4 M HCl-ethyl acetate (4 mL). After being stirred at room temperature for 1.5 h, the reaction mixture was concentrated in vacuo, and the residue was rinsed with hexane to obtain the title compound (266 mg, 100%).
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