[Cl:1][C:2]1[C:7]([O:8][CH3:9])=[C:6]([O:10][CH3:11])[CH:5]=[CH:4][C:3]=1[CH2:12][CH2:13][NH2:14].C(N(CC)CC)C.Cl[C:23]([O:25][CH2:26][CH3:27])=[O:24]>ClCCl>[Cl:1][C:2]1[C:7]([O:8][CH3:9])=[C:6]([O:10][CH3:11])[CH:5]=[CH:4][C:3]=1[CH2:12][CH2:13][NH:14][C:23](=[O:24])[O:25][CH2:26][CH3:27]To the solution of 2-(2-chloro-3,4-dimethoxyphenyl)ethanamine (2.8 g, 12.98 mmol) in dichloromethane (DCM) (40 mL) at 0° C. was added triethylamine (1.990 mL, 14.28 mmol) and ethyl chloroformate (1.371 mL, 14.28 mmol). The reaction mixture was stirred at room temperature for 12 hours. The resulting mixture was washed with water, brine, dried over magnesium sulfate and chromatographed to give ethyl 2-chloro-3,4-dimethoxyphenethylcarbamate (1.7 g, 5.91 mmol, 97% yield). LCMS (M+H)+: 288.1
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