Lewis acid-catalysed intramolecular nucleophilic attack of a hydrazonyl group onto aldehyde and ketone groups gives pyrazoles and dihydropyrazoles. Pyrazolo[1,5-a]indoles and related pyrazolo compounds have also been prepared.
J. Shen, H. Katayama, N. Takatsu and I. Shiro, J. Chem. Soc., Perkin Trans. 1, 1993, 2087 DOI: 10.1039/P19930002087
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