SCHEDULED MAINTENANCE
The reactions of enaminones (6-aminouracils) 1a–c and 4 with cyano olefins 2a–b and 5a–f led to the formation of pyrido[2,3-d]pyrimidines 3a–f and 6a–f in good yield, while the treatment of 4-amino-2-thiouracil 4 with aromatic aldehydes afforded pyridodipyrimidines 7a–c.
S. Youssif, S. El-Bahaie and E. Nabih, J. Chem. Res. (S), 1999, 112 DOI: 10.1039/A806513F
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