Reaction of 5-amino-1,3-dimethyl-6-phenylpyr-rolo[2,3-d]pyrimidine-2,4(1H,3H)-diones with lead tetraacetate gave 1,3-dimethyl-5-hydroxy-7-phenylpyrimido[4,5-d]pyrimidine-2,4(1H,3H)-diones.
F. Yoneda and M. Higuchi, J. Chem. Soc., Chem. Commun., 1972, 402 DOI: 10.1039/C39720000402
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