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Synthesis 1986; 1986(1): 78-80
DOI: 10.1055/s-1986-31486
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1,3-Dipolar Cycloadditions of 2-Diazopropane to 1-Phenyl-bis-s-triazolo[4,3-b:3′,4′-f]pyridazine. The Synthesis of 11,11-Dimethyl-11 H-pyrazolo [3,4-d]bis-s-triazolo[4,3-b:3′,4′-f]pyridazines, Derivatives of a Novel Heterocyclic System

Borut Furlan* , Branko Stanovnik, Miha Tišler
  • *Department, of Chemistry, Edvard Kardelj University of Ljubljana, Yu-61000 Ljubljana, Yugoslavia
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Publikationsdatum:
20. August 2002 (online)

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Diazopropane (2) undergoes [3 + 2]-cycloaddition with 1-phenyl-bis-s-triazole[4, 3-b:3′,4′-f]pyridazine (1), which is a derivative of a heteroaromatic 14π-electron system, to give a 1:1 mixture of 11,11-dimethyl-6-phenyl-(3a) and 11,11-dimethyl-3-phenyl-11 H-pyrazolo[3,4-d]-bis-s-triazolo[4, 3-b:3′,4′-f]pyridazine (3b). These compounds represent derivatives of a novel heterocyclic system. The structures of the products were determined by independent syntheses.