Additive-Free Pd-Catalyzed α-Allylation of Imine-Containing Heterocycles
作者:Marko Kljajic、Johannes G. Puschnig、Hansjörg Weber、Rolf Breinbauer
DOI:10.1021/acs.orglett.6b03407
日期:2017.1.6
An additive-free Pd-catalyzed alpha-allylation of different imino-group-ontaining heterocycles is reported. The activation of alpha-CH pronucleophiles (pK(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.