A new reagent 2-(trifluoromethylsulfonyloxy)pyridine (TFOP) was prepared by the reaction of sodium salt of 2-pyridinol with trifluoromethylsulfonyl chloride in dioxane. The compound TFOP in trifluoroacetic acid has been found to intermolecularly dehydrate from benzoic acid and aromatic hydrocarbons to give the corresponding benzophenones in high yield. It was further elucidated, in the reaction of
<i>N</i>-Acylimidazoles–Trifluoroacetic Acid System as the Acylating Agent for Aromatic Hydrocarbons
作者:Takashi Keumi、Hiroshi Saga、Hidehiko Kitajima
DOI:10.1246/bcsj.53.1638
日期:1980.6
aliphatic carboxylic acids or substituted benzoic acids with an electron-donating group gave ketones in high yields. The above-mentioned aromatic compounds were also acylated with N-trifluoroacetylimidazole and free carboxylic acids in trifluoroaceticacid. The mechanism for these reactions was assumed to proceed via a mixed anhydride between trifluoroaceticacid and carboxylic acid.