highly diastereo- and enantioselective aerobic oxidation–Michael–carbocyclization cascadetransformations by integrated heterogeneous Pd(0)-CPG nanoparticle/chiral amine relay catalysis are disclosed. The heterogeneous Pd(0)-CPG nanoparticle catalysts were efficient for both the sequential aerobic oxidation and dynamic kinetic asymmetric Michael–carbocyclization transformations, resulting in 1) oxidation
Enantioselective Heterogeneous Synergistic Catalysis for Asymmetric Cascade Transformations
作者:Luca Deiana、Lorenza Ghisu、Samson Afewerki、Oscar Verho、Eric V. Johnston、Niklas Hedin、Zoltan Bacsik、Armando Córdova
DOI:10.1002/adsc.201400291
日期:2014.8.11
AbstractA modular design for a novel heterogeneous synergistic catalytic system, which simultaneously activates the electrophile and nucleophile by the combined activation modes of a separate metal and non‐metal catalyst, for asymmetric cascade transformations on a solid surface is disclosed. This modular catalysis strategy generates carbocycles (up to 97.5:2.5 er) as well as spirocyclic oxindoles (97.5:2.5 to >99:0.5 er), containing all‐carbon quaternary centers, in a highly enantioselective fashion via a one‐pot dynamic relay process.magnified image