Journal of Fluorine Chemistry p. 253 - 256 (1994)
Update date:2022-08-11
Topics:
Guillaume, Michel
Janousek, Zdenek
Viehe, Heinz G.
Wynants, Chantal
Declercq, Jean-Paul
Tinant, Bernard
Ethyl 2-diazo-4,4,4-trifluoroacetoacetate reacts with N,N-diethylamino-prop-1-yne via an unusual pathway: the ynamine first reacts with the carbonyl adjacent to CF3, leading to a non-isolated vinyldiazomethane, which undergoes intramolecular cyclisation and then a <1,5>-shift to afford a pyrazole. - Keywords: Trifluoromethylated pyrazoles; Intramolecular cyclisation; Ynamine reaction; NMR spectroscopy; IR spectroscopy
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