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A series of 2-substituted 7-methylpyrimido[4,5-d]pyrimidin-4(3H)-ones have been synthesized in good yields by reaction of 4-amino-2-methylpyrimidine-5-carboxamide with aromatic aldehydes in the presence of three heteropolyacids, H3PMo12O40, H3PW12O40, and H5PV2Mo10O40. In this reaction the catalytic activity of H3PMo12O40 and H3PW12O40 was lower than that of H5PV2Mo10O40. All the synthesized compounds...
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