A highly efficient and regioselectivedirectC–H trifluoromethylation of pyridine based on an N-methylpyridine quaternary ammonium activation strategy has been developed. A variety of trifluoromethylpyridines can be obtained in good yield and excellent regioselectivity by treating the pyridinium iodide salts with trifluoroacetic acid in the presence of silver carbonate in N,N-dimethylformamide. The
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-Position-Selective C–H Perfluoroalkylation of Quinoline Derivatives
作者:Takahiro Shirai、Motomu Kanai、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.8b00339
日期:2018.3.16
We developed 2-position-selective, direct C–H trifluoromethylation, pentafluoroethylation, and heptafluoropropylation of quinolinederivatives. Regioselective transformation was achieved without derivatization of the quinolines. The reaction proceeded at room temperature with high functional group tolerance, even in gram scale. Notably, the reaction was applicable to substrates containing a functional
New Regiospecific Synthesis of 2-Trifluoromethyl-1,5 Diazapentadiene Compounds and of 2-Trifluoromethylquinolines, Their Cyclization Products
作者:Salem El Kharrat、Myriem Skander、Abdelkader Dahmani、Philippe Laurent、Hubert Blancou
DOI:10.1021/jo050586d
日期:2005.10.1
2-Trifluoromethylquinolines 5 are synthesized in high yields using a perfluoroalkylated gemiodoacetoxy derivative 3 and arylamines 4. The intermediate of this reaction, 2-trifluoromethyl-1,5-diazapentadiene compound 6, was isolated. The procedures are easy, and yields are in general high. This sequence represents a valuable new synthesis of substituted 2-trifluoromethylquinolines and of 2-trifluoromethyl-diazapentadienes (vinamidine compounds).