Ammonium Hydroxide → 6-Chloro-2-methylpyrimidin-4-amine

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A stirred suspension of 4,6-dichloro-2-methylpyrimidine (39.5 g, 244 mmol) in 1,2-dimethoxyethane (50 mL) in a sealable pressure reaction vessel was treated with concentrated aqueous ammonium hydroxide (40 mL). The mixture was vigorously stirred at 23° C. for 14 days in the sealed vessel. The mixture was then diluted with water and filtered. The isolated white solids were rinsed with water and dried in vacuo to afford 6-chloro-2-methyl-4-aminopyrimidine (20.94 g, 146 mmol, 60% yield): mp 191°-192° C.; Rf 0.49 (EtOAc); 1H NMR (DMSO-D6, 200 MHz)δ7.09 (br s, 2H, NH), 6.24 (s, 1H), 2.26 (s, 3H).

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