Literature data on the title reactions are reviewed and further examples given particularly with dialkylhydrazines and hydrazones. Compounds derived from 2-ethoxycarbonyl-4,6-diphenylpyrylium tend to cyclise and new examples of the dihydropyrazoloquinoline (27) and oxidopyrido[1,2-b]pyridazinium [(62)–(64)] ring systems are described.
A. R. Katritzky, P. Ballesteros and A. T. Tomas, J. Chem. Soc., Perkin Trans. 1, 1981, 1495 DOI: 10.1039/P19810001495
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