Process for the preparation of cyclic enamides

Details Process for the preparation of cyclic enamides Process for the preparation of cyclic enamides

C - Chemistry, Metallurgy

07

D

260/294, 260/316

C07D 211/70 (2006.01) C07D 211/76 (2006.01) C07D 223/10 (2006.01) C07D 243/08 (2006.01)

Patent

CA 1099711

Abstract of the disclosure: Special cyclic enamides I are prepared by splitting off alcohols catalytically from the corresponding cyclic amides II, in the presence of at least one tetraalkylammonium and/or alkali metal salt of tetrafluoroboric acid and/or of hexafluorophos- phoric acid as the catalyst, at a temperature of from about 120 to 250°C, distilling off the detached alcohol and iso- lating the formed enamide I in known manner. Those cyclic amides II are particularly preferred starting compounds, which have been obtained by anodic alkoxylation of corre- sponding cyclic N-compounds III in an alcohol in the presen- ce of supporting electrolytes which are identical with the catalysts subsequently used for splitting off the alcohol, and by distilling off the alcohol from the reaction batch. The enamides I are valuable starting products and inter- mediates for various syntheses, for example of prosta- glandins and of other pharmaceuticals.

302006

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