Facile access to fluoroalkylated 2-aminopyridines by Cu-catalyzed [3 + 3] couplings of oxime esters with β-CF3 acrylonitrile

Abstract

Copper catalyzed the [3 + 3] coupling of the oxime esters with β-CF3-acrylonitrile toward divergent fluoroalkyl-substituted 2-aminopyridines was described. This redox-neutral coupling conditions with the acrylonitrile affording the trifluoromethylated 2-aminopyridines, respectively, under the reductive conditions, difluoromethylated 2-aminopyridines were obtained. The reactions occurred under mild conditions with high functional-group compatibility and excellent regioselectivity.