A copper-catalyzed multicomponent reaction of sulfonyl azides, alkynes, and allylamines affording 2,3-dihydro-1H-imidazo-[1,2-a]indoles in moderate yields is reported. Four C–N bonds are constructed by way of azide-alkyne cycloaddition (CuAAC) and double Ullmann-type coupling reactions in a one-pot process.
Key words
multicomponent reaction - copper catalysis - azide-alkyne cycloaddition - Ullmann coupling reaction - 2,3-dihydro-1
H-imidazo[1,2-
a]indoles