To a stirred solution of amine (1.0 equiv.) in dry DCM (0.05 M) at 0°C was added dropwise NEt3 (1.2 equiv.). After 10 min, Boc2O was added, the reaction mixture was allowed to warm up to room temperature and stirred for 1 h. After this time, a saturated aqueous solution of NaHCO3 was added to the mixture and it was extracted with DCM. The combined organic layers were dried over MgSO4 and concentrated under reduced pressure. The crude residue was purified by flash chromatography on silica gel affording the desired protected amine.