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Mannich-type reaction of 5-amino-1,2,4-triazole 1, containing guanidine substructure, with the arylphosphonyl dichloride and aromatic aldehyde using cation exchange resin (D72, Amberlyst-15) to afford 6-phospha-4,5,6-trihydroimidazolo[2,3-e]1,2,4-triazole 4 is described. The microanalytical data, IR 1H NMR, 31P NMR and mass spectra of 6-phospha-4,5,6-trihydroimidazolo[2,3-e]1,2,4-triazole 4 are reported. The mechanism of the reaction is discussed.
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