Copper-Catalyzed Enantioselective β-Boration of Acyclic Enones
作者:Hak-Suk Sim、Xinhui Feng、Jaesook Yun
DOI:10.1002/chem.200802150
日期:2009.2.9
Josi or Mandy? Asymmetric conjugate addition of diboron to acyclicenones catalyzed by copper affords chiral organoboronates that possess a boronate group at the β stereocenter with excellent chemical yields and enantioselectivities (see scheme). This method accommodates the structural variation of acyclicenones and provides access to highly functionalized chiral organoboronates in one step.
Microwave-Assisted, Rhodium(III)-Catalyzed N-Annulation Reactions of Aryl and α,β-Unsaturated Ketones with Alkynes
作者:Hyejeong Lee、Yong-Kyun Sim、Jung-Woo Park、Chul-Ho Jun
DOI:10.1002/chem.201302699
日期:2014.1.3
New RhIII‐catalyzed, one‐pot N‐annulation reactions of aryl and α,β‐unsaturated ketones with alkynes in the presence of ammonium acetate have been developed. Under microwave irradiation conditions, the processes lead to rapid formation of the respective isoquinoline and pyridine derivatives with efficiencies that are strongly dependent on the steric nature of the aryl ring and enone substituents. By
that permits ring-closingmetathesis and bifunctional chiral amine (thio)urea-catalyzed Michael addition reactions to proceed in a one-pot fashion. The process offers an alternative approach to the synthesis of structurally diverse chiral cyclopentanes in good yields and good enantioselectivities. A relay strategy is described that permits ring-closingmetathesis and bifunctional chiral amine (thio)urea-catalyzed
The reagent of the title was found to promote the oxidation of alcohols to give the corresponding carbonyl compounds in good yields. The copper(II) oxidizing agent was easily prepared by the reaction of copper(II) bromide with lithium t-butoxide in THF.
Alkyl Cyclopropyl Ketones in Catalytic Formal [3 + 2] Cycloadditions: The Role of SmI2 Catalyst Stabilization
作者:Jack I. Mansell、Song Yu、Muze Li、Emma Pye、Chaofan Yin、Frédéric Beltran、James A. Rossi-Ashton、Ciro Romano、Nikolas Kaltsoyannis、David J. Procter
DOI:10.1021/jacs.4c03073
日期:2024.5.8
the use of SmI2 as a catalyst in combination with substoichiometric amounts of Sm0; the latter likely acting to prevent catalyst deactivation by returning SmIII to the catalytic cycle. In the absence of Sm0, background degradation of the SmI2 catalyst can outrun product formation. For the most recalcitrant alkyl cyclopropyl ketones, catalysis is “switched-on” using these new robust conditions, and otherwise