The synthesis of 5-substituted proline derivatives and of 5-substituted pyrrole-2-carboxylates by 5-endo cyclisations featuring a method for effectively favouring these with respect to 5-exo cyclisations
allyl ethyl carbonates with isocyanides in the presence of a catalytic amount of Pd(OAc)2 provided ketenimines through β‐hydride elimination of the allyl imidoylpalladium intermediates. The insertion of the isocyanide into the π‐allyl Pd complex proceeded via an unusual η1‐allyl Pd species. The resulting ketenimines were hydrolyzed to β,γ‐unsaturated carboxamides during purification by flash column chromatography
Direct Allylation of In Situ Generated Aldehyde Acyl Anions by Synergistic NHC and Palladium Catalysis
作者:Milind M. Ahire、Santosh B. Mhaske
DOI:10.1002/anie.201400623
日期:2014.7.1
The direct regioselective allylation of in situgeneratedaldehydeacylanions has been achieved by synergisticNHC and Pd catalysis. It provides an efficient access to valuable β,γ‐unsaturated ketones under mild reaction conditions starting from easily accessible allylic carbonates and aldehydes without any preactivation. The synergisticcatalysis method demonstrated herein adds a new dimension to
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
[EN] A PROCESS FOR THE SYNTHESIS OF beta, ƴ UNSATURATED KETONES<br/>[FR] PROCÉDÉ POUR LA SYNTHÈSE DE CÉTONES beta , ƴ INSATURÉES
申请人:COUNCIL SCIENT IND RES
公开号:WO2014037963A1
公开(公告)日:2014-03-13
The present invention disclose Pd/N-Heterocyclic carbene catalyzed one step process for synthesis of β,ƴ-unsaturated ketones by direct acylation of allylic Carbons with aldehydes.