[Cl:1][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[C:6](Cl)[C:5]([CH3:12])=[C:4]([CH3:13])[N:3]=1.C(N(CC)CC)C.[NH2:21][CH2:22][CH2:23][NH:24][C:25](=[O:31])[O:26][C:27]([CH3:30])([CH3:29])[CH3:28]>CN(C)C=O.C(OCC)(=O)C>[Cl:1][C:2]1[C:7]([N+:8]([O-:10])=[O:9])=[C:6]([NH:21][CH2:22][CH2:23][NH:24][C:25](=[O:31])[O:26][C:27]([CH3:29])([CH3:28])[CH3:30])[C:5]([CH3:12])=[C:4]([CH3:13])[N:3]=1A solution of 2,4-dichloro-5,6-dimethyl-3-nitropyridine (60 g, 271 mmol) in anhydrous N,N-dimethylformamide (600 mL) was cooled to 0° C. Triethylamine (44.8 mL, 326 mmol) was added drop wise followed by tert-butyl 2-aminoethylcarbamate (52.2 g, 326 mmol). After 30 minutes the ice bath was removed and the reaction mixture was heated to 60° C. The reaction was heated at 60° C. overnight and then it was concentrated under reduced pressure to provide an orange oil. The oil was dissolved in ethyl acetate (1 L), washed with water (3×500 mL), dried over magnesium sulfate and then concentrated under reduced pressure to provide a yellow oil. The oil was triturated with methanol (˜100 mL). The resulting solid was isolated by filtration and washed with cold methanol to provide 72.3 g of tert-butyl 2-[(2-chloro-5,6-dimethyl-3-nitropyridin-4-yl)amino]ethylcarbamate as a solid.
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