An enantioselective alkoxycarbonylation-amination cascade process of terminalallenes with CO, methanol, and arylamines has been developed. It proceeds under mild conditions (room temperature, ambient pressure CO) via oxidative Pd(II) catalysis using an aromatic spiroketal-based diphosphine (SKP) as a chiral ligand and a Cu(II) salt as an oxidant and affords a wide range of α-methylene-β-arylamino
Spiroketal-Based Diphosphine Ligands in Pd-Catalyzed Asymmetric Allylic Amination of Morita–Baylis–Hillman Adducts: Exceptionally High Efficiency and New Mechanism
atom of allyl moiety as a Lewisbase, and an alternative P atom coordinates to Pd atom. The cooperative action of organo- and organometallic catalysis discovered in the present catalytic system is most likely responsible for its high activity, as well as excellent regio- and enantioselectivities. The mechanism disclosed in the present catalytic system is distinct from most of the currently recognized mechanisms
Enantioselective and<i>α</i>-Regioselective Allylic Amination of Morita-Baylis-Hillman Acetates with Simple Aromatic Amines Catalyzed by Planarly Chiral Ligand/Palladium Catalyst
作者:Yan Wang、Tao Zhang、Li Liu
DOI:10.1002/cjoc.201200771
日期:2012.10.30
An asymmetric allylic amination of Morita‐Baylis‐Hillman acetates with simple aromatic amines catalyzed by planarly chiral ligand/palladium‐catalyst was developed in good yield with excellent α‐regioselectivity (α/γ up to 30:1) and moderate enantioselectivity (up to 70% ee).