SCHEDULED MAINTENANCE
1-Alkyl-5-amino-3-aryl-4-cyanopyrazoles, useful intermediates for fused heterocyclic systems, are synthesised by a one-pot three-step procedure from acid chlorides, malononitrile and alkylhydrazines. The regiochemistry of the hydrazine incorporation was proved in each case by X-ray crystallography and NMR spectroscopy.
U. Hanefeld, C. W. Rees, A. J. P. White and D. J. Williams, J. Chem. Soc., Perkin Trans. 1, 1996, 1545 DOI: 10.1039/P19960001545
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