Reactions of pyryliums with mono- and asym-di-substituted hydrazines

Abstract
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.

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