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A simple and effective method for the synthesis of unknown 1-methyl-7-arylfuro[3,2- g ]pteridine-2,4(1 H ,3 H )-diones by dehydration of the corresponding 1-methyl-6-phenacyl-pteridine-2,4,7(1 H ,3 H ,8 H )-triones is reported in the article. It was shown that their alkylation by butyl chloroacetate in basic medium proceeded by the N 3 -atom of the heterocycle. The structure and purity of the synthesized compounds were confirmed by IR,  1 H,  13 C NMR spectroscopy, gas chromatography-mass spectrometry, mass spectrometry, as well as X-ray diffraction analysis. The proposed mechanism of the dehydration reaction was discussed.

A Simple and Convenient Method for the Synthesis of 1-Methyl-7-arylfuro[3,2-g]pteridine-2,4(1H,3H)-diones and Their Substituted Derivatives