Phosphorus, sulfur, and silicon and the related elements · 2002 · 31 citations · 16 references
Natural SciencesChemistryMedicinal ChemistryDrug DiscoveryOrganic ChemistrySynthetic Medicinal ChemistryHeterocycle SynthesisHeterocyclic ChemistryOrganic SynthesisAcid Dissociation ConstantsHammett AnalysisThiadiazole ChemistryThiazole ChemistryTriazole Chemistry
Two synthetic approaches were developed for the title compounds 8a-g via coupling of diazotized anilines with 7-acetyl-6-methyl-3-phenyl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazine 7 , and reaction of N-aryl 2-oxopropanehydrazonoyl chlorides 9 with 4-amino-3-mercapto-5-phenyl-1,2,4-triazole 1 . The tautomeric structures of 8 were elucidated by their spectral analyses and correlation of their acid dissociation constants with Hammett equation.
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A.V. Bogatskii, S Andronati, Z.I. Zhilina et al. · 1975 · 1.2K citations
The structures of some 5-pyrazolones and derived 4-arylazo-5-pyrazolones
R. Norman Jones, Anthony J. Ryan, S Sternhell et al. · Tetrahedron · 1963 · 88 citations