4-(2-Cyanoacetamido)-5-nitropyrimidines cyclise smoothly in aqueous dilute sodium hydroxide at 40 °C to give high yields of the hitherto unknown 6-cyano-pteridin-7(8H)-one 5-N-oxides, whereas under reflux, the product are the corresponding pteridin-6(5H),7(8H)-diones or their 5-N-hydroxy derivatives.
G. Tennant and C. W. Yacomeni, J. Chem. Soc., Chem. Commun., 1975, 819 DOI: 10.1039/C39750000819
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