Additive-Free Pd-Catalyzed α-Allylation of Imine-Containing Heterocycles

Abstract

High Resolution Image Download MS PowerPoint Slide An additive-free Pd-catalyzed α-allylation of different imino-group-ontaining heterocycles is reported. The activation of α-CH pronucleophiles (p K a (DMSO) > 25) occurs without the addition of strong bases or Lewis acids using only the Pd/Xantphos catalyst system. The reaction scope has been studied for various 5- and 6-membered nitrogen-containing heterocycles (yields up to 96%). Mechanistic investigations suggest an initial allylation of the imine- N followed by a Pd-catalyzed formal aza-Claisen rearrangement.