Selected N-alkyl ketoimines having at least one methyl group at the imino carbon were reacted in a Stork enamine reaction with 22-difluoro-2-fluorosulfonylacetyl fluoride to yield enaminones carrying one fluorosulfonyldifluoromethylene function. In the case of N-tertbutyl methyl aldimine two of these groups were present in a triketone derivative. Taking a ethylene bis(imine) also a ring closure reaction was observed, proven by X-ray structure analysis. (C) 2010 Elsevier B.V. All rights reserved.
Ito, Kunio; Miyajima, Shingo, Journal of Heterocyclic Chemistry, 1992, vol. 29, # 5, p. 1037 - 1044