Treatment of 6-alkylamino-uracils with excess of diethyl azodicarboxylate gave the respective xanthine derivatives; reaction of 6-amino-5-(1,2-diethoxycarbonyl-hydrazino)-1,3-dimethyluracil with aryl aldehydes also gave the corresponding xanthine derivatives.
F. Yoneda, S. Matsumoto and M. Higuchi, J. Chem. Soc., Chem. Commun., 1975, 146 DOI: 10.1039/C39750000146
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