A method for the nucleophilic trifluoromethylation of salicyl aldimines, which do not contain an activating group at the nitrogen atom, has been described. The reaction proceeds through the initial generation of intramolecular boron complex followed by interaction with Me3SiCF3 activated by sodium acetate.
BF<sub>3</sub>-Promoted Aromatic Substitution of<i>N</i>-Alkyl<i>α</i>-Trifluoromethylated Imine: Facile Synthesis of 1-Aryl-2,2,2-trifluoroethylamines
作者:Yuefa Gong、Katsuya Kato、Hiroshi Kimoto
DOI:10.1246/bcsj.75.2637
日期:2002.12
The aromaticsubstitution of three representative N-alkyl trifluoromethyl imines 1a–c (R: a, benzyl; b, benzhydryl; c, methyl), obtained from primary alkyl amines and trifluoroacetaldehyde ethyl hemiacetal, was used to investigate the preparation of 1-aryl-2,2,2-trifluoroethylamines. In the presence of BF3·OEt2, the reaction of imine 1 with various aromaticcompounds proceeded smoothly at room temperature