Ethanol → N-(4-methoxyphenyl)-N,2-dimethylpteridin-4-amine

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4-Chloro-2-methyl-pteridine. A mixture of 6-chloro-2-methyl-pyrimidine-4,5-diamine (37 mg, 0.233 mmol) and 1,4-dioxane-2,3-diol (32 mg, 0.266 mmol) in 0.8 mL of absolute ethanol was stirred at room temperature for 2 h. The reaction mixture was evaporated to dryness and the residue was purified by column chromatography (50% ethyl acetate/hexane) to give the title compound (41 mg, 0.227 mmol, 97%). 1H NMR (CDCl3): 9.24 (d, J=1.8, 1H), 9.05 (d, J=1.5, 1H), 2.99 (s, 3H).

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