Chemical properties of the 5-methyl-7-phenyl-4,7-dihydro-1,2,4-triazolo-[1,5-a]pyrimidin-6-carbaldehyde and its derivatives

Reactions of 5-methyl-7-phenyl-4,7-dihydro-1,2,4-triazolo-[1,5-a]pyrimidin-6-carbaldehyde with different oxidizing reagents, nitrogen containing nucleophiles and CH-acids have been studied. The structure of the synthesized compounds was determined on the basis of 1H, 13C NMR, IR, and MS spectroscopic data and confirmed by the X-ray analysis of the 5-methyl-6-nitro-7-phenyl[1,2,4]triazolo[1,5-a]pyrimidine, 5-dibromomethyl-6-brom-7-phenyl[1,2,4]triazolo-[1,5-a]pyrimidine, and 5-((4,7-dihydro-5-methyl-7-phenyl-[1,2,4]triazolo[1,5-a]pyrimidin-6-yl)methylene)pyrimidine-2,4,6(1H,3H,5H)-trione.