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Communication | Regular issue | Vol 23, No. 1, 1985, pp.1-4
Published online, 1st January, 1970
DOI: 10.3987/R-1985-01-0001
1,3-Dipolar Cycloaddition of 2-Diazopropane to Pyrimido[1,2-b]pyridazun-4-one Derivatives. The Synthesis of Pyrazolo[4,3-d]pyrimido[1,2-b]pyridazin-4(10H)-ones, Derivatives of a Novel Heterocyclic System

Branko Stanovnik,* Breda Boznar, Bozidar Koren, Sasa Petricek, and Miha Tisler

*Department of Chemistry, E. Kardelj University, Murnikova 6, 61000 Ljubljana, Slovenia

Abstract

Facile regiospecific cycloaddition of 2-diazopropane (2) to the pyrimido[1,2-b]pyridazin-4-ones (1a-d), derivatives of 10Π-electron heteroaromatic bicyclic system, give the pyrazolo[4,3-d]pyrimido[1,2-b]pyridazin-4(10H)-ones (4a-d) in 32-52% yields.