2,4-Dimethoxybenzonitrile → 1H-Purine, 8-(2,4-dimethoxyphenyl)-

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A mixture of 2 g of 4,5-diamino-pyrimidine, 4 g of 2,4-dimethoxy-benzonitrile, 6 g of p-toluene sulfonic acid hydrate, and 40 ml of benzene was heated, whereby the benzene was distilled off. The residue was heated for 30 minutes at 120° C. After cooling the residue was triturated with 2 N ammonia and extracted with ethyl acetate. The ethyl acetate phase was extracted with 2 N hydrochloric acid, the aqueous phase was neutralized and again extracted with ethyl acetate, and subsequently the organic phase was extracted with 2 N sodium hydroxide solution. When the aqueous phase was neutralized, the product was precipitated and recrystallized from water.

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