Three-component cyclization of 4-aryl-1,4-dihydrobenzo[4,5]imidazo[1,2- a][1,3,5]triazin-2-amines with formaldehyde and primary amines gave the corresponding 6-unsubstituted or 6-aryl-2-alkyl-2,3,4,6-tetrahydro-1 H-[1,3,5]triazino[1′,2′:3,4][1,3,5]triazino[1,2- a]benzimidazoles.