Treatment of 6-aminopyrimidines with 4-phenyl-1,2,4-triazoline-3,5-dione gave the Michael-type adducts, 6-amino-5-(4-phenylurazol-1-yl)pyrimidines; fusion of these adducts with several aryl aldehydes gave the corresponding 8-arylpurines.
F. Yoneda, S. Matsumoto and M. Higuchi, J. Chem. Soc., Chem. Commun., 1974, 551 DOI: 10.1039/C39740000551
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