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Pyrimidine-diones, Caffeine Metabolites, Synthesis 5-Acetylamino-6-amino-3-methyluracil (AAMU) and 5-acetylamino-6-formylamino-3-methyluracil (AFMU) have been prepared by simple chemical transformations starting from thiourea and ethyl cyanoacetate. These compounds AAMU and AFMU are required as standard materials for qualitative identification and quantitative determination in connection with the metabolism of caffeine.

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Synthesis of the Caffeine Metabolites 5-Acetylamino-6-formylamino- 3-methyluracil (AFMU) and 5-Acetylamino-6-amino-3-methyluracil (AAMU) on a Preparative Scale