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
Copper-Catalyzed Addition of Halide and Sulfide Groups to Alkynes Utilizing Disulfides with Tetrabutylammonium Halides
作者:Nobukazu Taniguchi
DOI:10.1055/s-2008-1042903
日期:2008.4
A copper-catalyzed addition of halide and sulfide groups to internal alkynes was carried out using disulfides with N-Bu 4 NX (X = Br, I or Cl) in air. The present reaction can selectively prepare the corresponding ANTI-configured haloalkenyl sulfide, and uses both sulfide groups of the disulfide reagent.
Nitric Acid Promoted Metal-Free Bromothiolation of Internal Alkynes with Hydrobromic Acid and Disulfides
作者:Xiao-Cheng Huang、Han Sun、Zhi-Xiang Yao、Hui Su
DOI:10.1055/s-0040-1719934
日期:2022.9
A novel, metal-free bromo-thiolation of internal alkynes with hydrobromicacid and disulfides has been developed. The reaction is promoted by commercial-grade nitricacid and is used to construct a series of unexplored β-bromoalkenyl sulfides in moderate to good yield. Most products were obtained with high stereoselectivity as syn-configured tetrasubstituted alkenes. Both sulfide groups of the disulfide
Controlling Selectivity in Shuttle Hetero‐difunctionalization Reactions: Electrochemical Transfer Halo‐thiolation of Alkynes
作者:Xichang Dong、Martin Klein、Siegfried R. Waldvogel、Bill Morandi
DOI:10.1002/anie.202213630
日期:2023.1.9
Shuttle catalysis is emerging as a potent strategy to unleash unprecedented synthetic flexibility in organic synthesis. Herein, we disclose a rare example of shuttle hetero-difunctionalization to transfer two distinct functional groups between β-halosulfides and alkynes with excellent chemo-, regio-, and stereoselectivity via a paired electrolysis process. This unfolds new opportunities for selective