A Trial toward the Synthesis of γ-Fluorinated β-Amino-α-thiohydroxyamino Acid: A Finding of Desulfurizative C−C Bond Formation in Thio-Wittig-Type Rearrangement of S-(N-Aryltrifluoroacetimidoyl)thioglycolates
converted to trifluoromethylated indoles by the tin-radical promoted homolysis of the carbon–iodine bond followed by intramolecular cyclization. The photolysis of trifluoroacetimidoyl iodides enabled both intra- and intermolecular cyclization to indoles and quinolines. Likewise, thermal reactions of N-(2,2,2-trifluoro-1-tritylazoethylidene)anilines provided trifluoromethylatedquinolines and indoles
Trifluoroacetimidoyl chlorides 1 were obtained in 80-90 % yields when a mixture of trifluoroacetic acid and a primary amine was heated in carbon tetrachloride in the presence of triphenylphosphine and triethylamine. The corresponding bromides 2 were obtained when carbon tetrabromide was used instead of carbon tetrachloride. Imidoyl iodides 3 were prepared by substitution of the chloro group of 1 by iodide ion in acetone.