The reaction of 5-bromo-1,3-dimethyluracil (1) with active methylene compounds in the presence of base gave 5,6-disubstituted 5,6-dihydrouracil derivative (2), 2,4-diazabicyclo[4.1.0]heptane derivatives (4), and 2,4-diazabicyclo[4.3.0]nonane derivative (5), the formation of which was significantly dependent on the nature of the carbaions.
K. Hirota, H. Sajiki, Y. Maki, H. Inoue and T. Ueda, J. Chem. Soc., Chem. Commun., 1989, 1659 DOI: 10.1039/C39890001659
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