1,4-Dihydropyridazino[4,5-c]pyridazinones were prepared by a novel one-pot cyclization and dehydrogenation from hydrazinopyridazinones and dimethyl acetylenedicarboxylate.
T. Yamasaki, E. Kawaminami, T. Yamada, T. Okawara and M. Furukawa, J. Chem. Soc., Chem. Commun., 1990, 645 DOI: 10.1039/C39900000645
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