Convenient synthesis of α-trifluoromethyl amines via aminofluoroalkylation of arenes with N-trimethylsilyl α-trifluoroacetaldehyde hemiaminal

Aminofluoroalkylation of various heteroarenes or substituted benzenes with the N-trimethylsilyl hemiaminals, prepared from 1,1,1,3,3,3-hexamethyldisilazane and gaseous trifluoroacetaldehyde, smoothly underwent at room temperature in the presence of a Lewis acid. (1-Aryl-2,2,2-trifluoro)ethyl]amines or bis(1-aryl-2,2,2-trifluoro)ethyl]amines were afforded in moderate to high yields.