[Cl:1][C:2]1[N:7]=[C:6](Cl)[C:5]([N+:9]([O-:11])=[O:10])=[CH:4][N:3]=1.[CH2:12]([NH2:14])[CH3:13]>C1COCC1.CC(O)C>[Cl:1][C:2]1[N:7]=[C:6]([NH:14][CH2:12][CH3:13])[C:5]([N+:9]([O-:11])=[O:10])=[CH:4][N:3]=1To a solution of 5.82 g (30 mmol) of 2,4-dichloro-5-nitropyrimidine (N. Whittaker, J. Chem. Soc., 1951:1565–1570) in 100 mL THF at −78° C. is added dropwise over 5 minutes a solution of 3.87 g (60 mmol) of 70% aqueous ethylamine in 20 mL of 2-propanol. After being stirred at −78° C. for 15 minutes, the reaction mixture is allowed to warm to room temperature, and the solvent is removed under vacuum. The residue is worked up in EtOAc and chromatographed on silica, eluting with hexane/EtOAc (92:8), to give 4.90 g (81%) of the title compound: mp (hexane) 64–66° C.
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