General procedure for the synthesis of 2-amino-4,6-dimethyl-5-bromopyrimidine from 2-amino-4,6-dimethylpyrimidine: To a stirred solution of 150 mL of acetonitrile containing 4.3 g (34.75 mmol) of 2-amino-4,6-dimethylpyrimidine, 6.15 g (52.12 mmol) of N-bromosuccinimide was added. The reaction mixture was stirred under argon protection at room temperature for 3 hours. Upon completion of the reaction, the precipitate formed was collected by filtration and dried to afford the target product 2-amino-4,6-dimethyl-5-bromopyrimidine as a white solid in a yield of 5.93 g (83% yield). The structure of the product was confirmed by 1H-NMR (CDCl3) δ 5.19 (br, 2H), 2.44 (s, 6H) and 13C-NMR (CDCl3) δ 166.28, 160.73, 109.60, 24.70.
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