Aerobic copper-catalyzed synthesis of (E)-alkenyl sulfones and (E)-β-halo-alkenyl sulfones via addition of sodium sulfinates to alkynes
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2014.01.071
日期:2014.3
(E)-alkenyl sulfones. When a CuCl catalyst was employed, the hydrosulfonylation proceeded syn-selectively, and (E)-alkenyl sulfones were synthesized in excellent yields. In contrast, the reaction using CuI catalyst produced (E)-β-haloalkenyl sulfones anti-selectively in the presence of potassium halides. Furthermore, the (E)-β-bromoalkenyl sulfones are possible to convert into various alkenyl sulfones by Suzuki–Miyaura
Stereoselective Synthesis of (E)-Alkenyl Sulfones from Alkenes or Alkynes via Copper-Catalyzed Oxidation of Sodium Sulfinates
作者:Nobukazu Taniguchi
DOI:10.1055/s-0030-1260544
日期:2011.6
Alkenyl sulfones can be stereoselectively synthesized from alkenes or alkynes using sodium sulfinates. The reaction can be performed by a copper-catalyzedoxidation of sodium sulfinates in air. The reaction of alkenes gives (E)-alkenyl sulfones via anti addition of sulfonyl cation and elimination process. Furthermore, the employment of alkynes produces (E)-β-haloalkenyl sulfones in the presence of
Visible-Light-Mediated Photoredox-Catalyzed Regio- and Stereoselective Chlorosulfonylation of Alkynes
作者:Prashant Chakrasali、Kyuneun Kim、Young-Sik Jung、Hyejin Kim、Soo Bong Han
DOI:10.1021/acs.orglett.8b03273
日期:2018.12.7
Herein, a one-step chlorosulfonylation of alkynes via a photocatalytic redox process is described. A variety of commercially available sulfonylchlorides can be applied for the generation of sulfonyl radical species under visible-light irradiation. Regio- and stereoselective addition of the sulfonyl radical and chloride leads to the efficient formation of (E)-selective β-chlorovinyl sulfones from a
Cobalt-catalyzed stereoselective iodosulfonylation and diiodination of alkynes via oxidation of potassium iodide in air
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2018.02.004
日期:2018.3
Cobalt-catalyzed iodosulfonylation of alkynes can be achieved using sodium sulfinates in the presence of KI. This procedure produces numerous stereoselective (E)-β-iodoalkenyl sulfones with good yields and suppresses the formation of diiodoalkenes. Furthermore, when this reaction is performed in the absence of sodium sulfinates, the expected (E)-diiodoalkenes are obtained.
Copper-Catalyzed Oxidative Hydrosulfonylation of Alkynes Using Sodium Sulfinates in Air
作者:Nobukazu Taniguchi
DOI:10.1055/s-0031-1290934
日期:2012.5
Copper-catalyzed hydrosulfonylations of alkynes can be carried out using sodium sulfinates in air. The procedure affords syn-selectively (E)-alkenyl sulfones in good yields. Then, both terminal and internal alkynes are available.