Methyl iodide → 7-Amino-4-methylthiopyrido[4,3-d]pyrimidine

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NEt3 (6 mL, 43 mmol) is added to a solution of 7-amino-4-thiono-3H-pyrido[4,3-d]pyrimidine (0.77 g, 4,3 mmol) in DMSO (7 mL) stirred under N2 at 25° C. After the two phases have been stirred for 20 min, MeI (0.26 mL, 4.2 mmol) is added. After 2 h, the reaction mixture is poured onto stirring ice-water. Solid forms instantly. After further cooling at 0° C., the solid is collected by suction filtration and dried in a vacuum oven to give 7-amino-4-methylthiopyrido[4,3-d]pyrimidine (0.564 g, 68%). 1H NMR (DMSO) δ 8.98 (1H, s), 8.71 (1H, s), 6.94 (2H, brs), 6.49 (1H, s) 2.63 (3H, s).

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