Synthesis of diaryl-substituted 3,4-dimethyl-2-oxo-1,2,3,6-tetrahydropyrimidine-5-carboxamides

In the H NMR spectra of compounds I–V, alongside the signals of aromatic protons and groups attached to the aromatic ring, there are two singlets at 3.05–3.10 and 1.91–2.27 ppm belonging to the CH3 groups, the doublets of СН proton at 5.22–5.64 ppm, and of the NH proton at 7.60–7.96 ppm (J1,6 2.95– 3.33 Hz), the singlet of the amide protons in the range of 9.02–9.43 ppm. The splitting of signals of the H protons of the pyrimidine ring indicates that the DOI: 10.1134/S1070363213040324