A new strategy, a transient homocoupling dimer strategy, for direct catalytic oxidative cross-enolate coupling reactions is developed. Cross-enolate coupling products bearing a (contiguous) tetrasubstituted carbon center were obtained chemoselectively without the need for stoichiometric amounts of strong bases/metal oxidants, and thus, the present catalysis provides a general method for the synthesis
Asymmetric Synthesis of Multi‐Substituted Tetrahydrofurans via Palladium/Rhodium Synergistic Catalyzed [3+2] Decarboxylative Cycloaddition of Vinylethylene Carbonates
作者:Siliang Ming、Saira Qurban、Yu Du、Weiping Su
DOI:10.1002/chem.202102024
日期:2021.9.6
efficient synergistic catalysis for the diastereo- and enantioselectivesynthesis of multi-substituted tetrahydrofuran derivatives has been developed. Under mild reaction conditions, a series of target molecules with three consecutive stereocenters were synthesized by a palladium(0)/rhodium(III) bimetal-catalyzed asymmetricdecarboxylative [3+2]-cycloaddition of vinylethylene carbonates with α,β-unsaturated
Oxidative annulations via double CH bond cleavages: Approach to quinoline derivatives
作者:Zhenghui Liu、Shien Guo、Peng Wang、Zhenzhong Yan、Tiancheng Mu
DOI:10.1002/aoc.6156
日期:2021.4
system via oxidative annulations was proposed. A systematic exploration was completed. All kinds of reaction parameters were determined. And 55 kinds of target molecules were obtained with moderate to high yields. Combination of double oxidants made the conversion proceed smoothly. A clear reaction mechanism was put forward. Adjacent π systems might provide assistance for realizing the activation of relatively
of methyl aluminum complexes bearing chiral biphenol-type ligands were found to be highly active catalysts in the asymmetric reduction of heterocyclic ketones (S/C = 100 - 500, ee up to 99%). The protocol is suitable for a wide range of substrates and has a high tolerance to functional groups. The formed 2-heterocyclic-alcohols are valuable buildingblocks in drug discovery or can be used as ligands
Enantioselective Synthesis of Multisubstituted Spirocyclopentane Oxindoles Enabled by Pd/Chiral Rh(III) Complex Synergistic Catalysis
作者:Qian Wan、Liang Chen、Shiwu Li、Qiang Kang、Yaofeng Yuan、Yu Du
DOI:10.1021/acs.orglett.0c03588
日期:2020.12.18
2]-cycloaddition reaction of α,β-unsaturated 2-acyl imidazoles with spirovinylcyclopropanyl-2-oxindoles catalyzed synergistically by an achiral palladium(0) catalyst and a chiral-at-metal rhodium(III) complex has been developed. A series of biologically important 3-spirocyclopentane-2-oxindoles with four contiguous stereocenters were synthesized in high yields (up to 99%) with excellent stereoselectivities