Direct preparation of benzylic manganese reagents from benzyl halides, sulfonates, and phosphates and their reactions: applications in organic synthesis
作者:YoungSung Suh、Jun-sik Lee、Seoung-Hoi Kim、Reuben D Rieke
DOI:10.1016/s0022-328x(03)00500-x
日期:2003.11
The use of highly active manganese (Mn)*, prepared by the Rieke method, was investigated for the direct preparation of benzylic manganese reagents. The oxidative addition of the highly active manganese to benzylic halides was easily completed under mild conditions. Moreover, benzylic manganese sulfonates and phosphates were prepared by direct oxidative addition of Mn* to the carbon–oxygen bonds of
Palladium-Catalyzed Denitrative α-Arylation of Ketones with Nitroarenes
作者:Zhirong Li、Yonggang Peng、Tao Wu
DOI:10.1021/acs.orglett.0c04104
日期:2021.2.5
The palladium-catalyzed α-arylation of ketones with readily available nitroarenes and nitroheteroarenes provides access to useful α-aryl and α-heteroaryl ketones. The use of the Pd/BrettPhos catalysts was critical to achieve high efficiency for these transformations, whereas other catalysts led to decreased yields or no conversions. The intramolecular type substrate was also applied in this methodology
Stabilization of Ketone and Aldehyde Enols by Formation of Hydrogen Bonds to Phosphazene Enolates and Their Aldol Products
作者:Kristopher J. Kolonko、Hans J. Reich
DOI:10.1021/ja804221x
日期:2008.7.1
the benzyl ketones 1a and 1b, the acetophenone 2, the arylacetaldehyde 1c, and the methyl arylacetate 1d formed the expected "naked" (P4H+) enolates 3 and 7. However, at a half-equivalent of base the ketones 1a and 1b as well as the aldehyde 1c formed solutions of stable hydrogen-bonded dimeric (enol-enolate) structures (4). The acetophenone 2, on the other hand, forms only traces of the H-bonded dimer
Thianthrenation-Enabled α-Arylation of Carbonyl Compounds with Arenes
作者:Xiao-Xue Nie、Yu-Hao Huang、Peng Wang
DOI:10.1021/acs.orglett.0c02913
日期:2020.10.2
The Pd-catalyzed α-arylation of carbonylcompounds with simple arenes enabled by site-selective thianthrenation has been demonstrated. This one-pot process using thianthrenium salts as the traceless arylating reagents features mild conditions and a broad substrate scope. In addition, this protocol could also tolerate the heterocyclic carbonylcompounds and complex bioactive molecules, which is appealing
Abstract α-Arylated ketones were obtained in moderate to good yields by one-step electroreductive coupling of α-chloroketones and arylhalides in DMF and in the presence of a Al- or Zn-sacrificial anode and a catalytic amount of a nickel complex.