2-(Substituted amidino)-2-aminoacetamides were cyclised with 1,2-dicarbonyl reagents to 3-(substituted amino)pyrazine-2-carboxamides which were converted, where possible, into the corresponding 1-substituted pteridin-4(1H)-ones and 1-substituted pteridine-2,4(1H)-diones.
W. F. Keir, A. H. MacLennan and H. C. S. Wood, J. Chem. Soc., Perkin Trans. 1, 1977, 1321 DOI: 10.1039/P19770001321
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