To a solution of (2-bromo-5-chloro-phenyl)methanamine (500 mg, 2.27 mmol) in dry DCM (10 mL), under argon, was added TEA (0.35 ml, 2.49 mmol) and BOC anhydride (593.89 mg, 2.72 mmol) and the solution was stirred at room temperature overnight. The reaction mixture was washed with water (2x10 mL). The organic layer was dried over Na2SO4 and evaporated under vacuum to obtain the product 704 mg (96.8%) of tert-butyl methyl]carbamate as a white solid.