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Paper | Special issue | Vol 40, No. 2, 1995, pp.661-680
Published online, 1st January, 1970
DOI: 10.3987/COM-94-S55
Heterocyclisation of 3-Trifluoroacetyllactams by Hydrazines

Jean-Philippe Bouliion, Anne-Marie Frisque-Hesbain, Zdenek Janousek, and Heinz G. Viehe

*Laboratoire de Chimie Organique, Université de Louvain, Place Louis Pasteur 1, B-1348 Louvain-la-Neuve, Belgium


3-Trifluoroacetyllactams may heterocyclize with hydrazine or with its methyl or phenyl derivative either without ring opening to annelated trifluoromethylpyrazoles or by Ring Opening - Ring Closure (RORC) reaction to zwitterionic salts of 4-ω-alkylamino-5-hydroxy-3-trifluoromethylpyrazoles.