The reaction of iminium triflates 2 and 7 with various aromaticamines were investigated. The 2-Rf-substituted quinolines 3 and 8 were prepared in excellent yields by the reaction of 2 and 7, respectively, with substituted anilines. The reactions of 2 and 7 with diarylamines proceeds, suprisingly, to afford the corresponding 3-Rf-substituted cinnamaldehydes 4 and 9.
2-(Trifluoromethyl)quinolines from anilines: A novel mode of isomerization and cyclization
作者:Holger Keller、Manfred Schlosser
DOI:10.1016/0040-4020(96)00168-8
日期:1996.3
in the presence of phosphoryl trichloride, the resulting 4-anilino-1,1,1-trifluorobut-3-en-2-ones undergo an N → ortho shift of the side chain followed by cyclization and dehydration to afford 2-(trifluoromethyl)quinolines.