SCHEDULED MAINTENANCE
Hydrazine adds to allenic or acetylenic nitriles to give 3-alkyl-substituted 5-aminopyrazoles in excellent yields. Conjugated and unconjugated enaminic nitriles may be isolated from the Michael addition of phenylhydrazine to allenic nitriles and ring-closed to give 3-alkyl-5-amino-N-phenylpyrazoles and 3H-indoles.
Z. T. Fomum, S. R. Landor, P. D. Landor and G. W. P. Mpango, J. Chem. Soc., Perkin Trans. 1, 1981, 2997 DOI: 10.1039/P19810002997
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