The reaction of amidrazones 1 with \alpha-haloesters 2 formed 1,3,5-substituted 4,5-dihydro-1,2,4-triazin-6-ones (4a-z) rather than 1,2,4-triazin-5-one derivatives (5a-z). The microanalysis and spectral data of the synthesized compounds are in full agreement with their molecular structure.
DALLOUL, HANY M. and BOYLE, PETER H. (2007) "Synthesis of Nitrogen-Containing Heterocycles from the Reaction of Amidrazones with \alpha-Haloesters," Turkish Journal of Chemistry: Vol. 31: No. 2, Article 4. Available at: https://journals.tubitak.gov.tr/chem/vol31/iss2/4