Iridium(I)-Catalyzed Regio- and Enantioselective Decarboxylative Allylic Amidation of Substituted Allyl Benzyl Imidodicarbonates
摘要:
The first Ir(I)-catalyzed decarboxylative allylic amidation of allyl benzyl imidodicarbonates is described. The reaction requires Ir(I), chiral phosphoramidite ligand, and DBU as well as proton sponge, and proceeds with excellent regio- and enantioselectivities to afford the branched 1-(aryl/alkyl)-1-benzyloxycarbonylaminoprop-2-ene in good to excellent yields. The scope, mechanism, and synthetic applications of the developed catalytic reaction are discussed.
Iridium(I)-Catalyzed Regio- and Enantioselective Decarboxylative Allylic Amidation of Substituted Allyl Benzyl Imidodicarbonates
摘要:
The first Ir(I)-catalyzed decarboxylative allylic amidation of allyl benzyl imidodicarbonates is described. The reaction requires Ir(I), chiral phosphoramidite ligand, and DBU as well as proton sponge, and proceeds with excellent regio- and enantioselectivities to afford the branched 1-(aryl/alkyl)-1-benzyloxycarbonylaminoprop-2-ene in good to excellent yields. The scope, mechanism, and synthetic applications of the developed catalytic reaction are discussed.
Ir(I)-catalyzed decarboxylative allylic amidation of chiral branched benzyl allyl imidodicarboxylates has been shown to proceed with complete retention of enantiomeric purity and configuration. The transformation is stereospecific and appears to be quite general, accommodating a wide range of R groups.
Iridium(I)-catalyzed regio- and enantioselective allylic amidation
作者:Om V. Singh、Hyunsoo Han
DOI:10.1016/j.tetlet.2007.08.009
日期:2007.10
Ir(I)-catalyzed intermolecularallylic amidation of ethyl allylic carbonates with soft nitrogen nucleophiles under completely "salt-free" conditions is described. A combination of [Ir(COD)Cl](2), a chiral phosphoramidite ligand L*, and DBU as a base in THF effects the reaction. The reaction appears to be quite general, accommodating a wide variety of R-groups and soft nitrogen nucleophiles, and proceeds