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It is found that 1,2-dihydropyridine derivatives: 6-aryl-2,3-dihydro-6aH-imidazo[1,2-a]pyrido[1,2-c][1,3,5]triazin-5(6H)-ones and 3,6,7,8a-tetrahydro-2H-diimidazo[1,2-c:1',2'-e]pyrido[1,2-a][1,3,5]triazine underwent Diels-Alder reactions with highly reactive azadienophiles: 4phenyl-1,2,4-triazoline-3,5-dione and phthalazine-1,4-dione. The structures of the products were confirmed by IR, 1 H– 13 C heterocorrelated 2D NMR spectra HSQC and HMBC, mass spectra as well as single crystal X-ray crystallography.