2-Nitrophenacylidene phenylhydrazones (2) undergo base-catalysed cyclisation by intramolecular nucleophilic displacement of the nitro-group by the ortho-side-chain, providing an efficient general route to 3-substituted 1-phenylcinnolin-4(1H)-ones (3).
A. A. Sandison and G. Tennant, J. Chem. Soc., Chem. Commun., 1974, 752 DOI: 10.1039/C39740000752
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