Copper-Catalyzed Three-Component Cascade Michael Addition/Heck-Type Alkylation/Annulation: Accessing Fully Substituted 1,3-Dihydro-2<i>H</i>-pyrrol-2-ones

Abstract

We report a highly efficient copper-catalyzed three-component reaction of alkylamines, acetylenedicarboxylates, and α-bromocarbonyls for the assembly of fully substituted 1,3-dihydro-2<i>H</i>-pyrrol-2-ones. A variety of alkylamines and ammonium salt are functionalized with acetylenedicarboxylates and α-bromocarbonyls. <i>N</i>-aryl enaminoesters are also successfully alkylated with α-bromocarbonyls. This protocol is understood to proceed through radical Heck-type coupling of in-situ-generated bulky trisubstituted alkenes with bulky tertiary alkyl bromides, which is realized for the first time.