Visible-Light-Mediated Regioselective Chlorosulfonylation of Alkenes and Alkynes: Introducing the Cu(II) Complex [Cu(dap)Cl<sub>2</sub>] to Photochemical ATRA Reactions
photocatalyzed protocol utilizing copper–phenanthroline-based catalysts has been developed that can convert a large number of olefins into their chlorosulfonylated products. Besides the Cu(I) complex [Cu(dap)2]Cl, now well-established in photo-ATRA processes, the corresponding Cu(II) complex [Cu(dap)Cl2] proved to be often even more efficient in the title reaction, being advantageous from an economic point of view
已经开发出一种利用铜-菲咯啉基催化剂的可见光介导的光催化方案,该方案可以将大量烯烃转化为其氯磺酰化产物。除了现在在光ATRA工艺中已经确立的Cu(I)络合物[Cu(dap)2 ] Cl之外,相应的Cu(II)络合物[Cu(dap)Cl 2 ]常常在光催化ATRA工艺中更有效。标题反应,从经济角度来看是有利的,但也为光氧化还原催化开辟了新途径。此外,由于它们通过内球机理稳定或与瞬态自由基相互作用的能力,铜配合物的性能优于常用的钌,铱或有机染料基光催化剂。化学计量的Na 2 CO 3的使用与不需要添加剂的活性烯烃相反,发现与铜光催化剂组合使用对将未活性烯烃转化为所需产物是必不可少的。如适当的对照实验所建议的,Na 2 CO 3的作用归因于防止催化剂中毒。
Iron(III) Chloride-Mediated Regio- and Stereoselective Chlorosulfonylation of Alkynes and Alkenes with Sodium Sulfinates
The atom‐economic and one‐pot regio‐ and stereoselective addition of sodiumarenesulfinates to either alkynes or alkenes can be achieved with an iron(III) chloride hexahydrate [FeCl3⋅6 H2O] catalytic system to afford β‐haloalkenyl and β‐chloroalkyl sulfones in moderate to good yields.
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
Iron-Catalyzed Regio- and Stereoselective Chlorosulfonylation of Terminal Alkynes with Aromatic Sulfonyl Chlorides
作者:Xiaoming Zeng、Laurean Ilies、Eiichi Nakamura
DOI:10.1021/ol203446t
日期:2012.2.3
Terminal alkynes react with aromatic sulfonyl chlorides in the presence of an iron(II) catalyst and a phosphine ligand to give (E)-β-chlorovinylsulfones with 100% regio- and stereoselectivity. Various functional groups, such as chloride, bromide, iodide, nitro, ketone, and aldehyde, are tolerated under the reaction conditions. Addition of tosyl chloride to a 1,6-enyne followed by radical 5-exo-trig
Phosphine Evaluation on a New Series of Heteroleptic Copper(I) Photocatalysts with dpa Ligand [Cu(dpa)(
<i>P,P</i>
)]BF
<sub>4</sub>
作者:Marco A. Henriquez、Sebastian Engl、Pablo Jaque、Ivan A. Gonzalez、Mirco Natali、Oliver Reiser、Alan R. Cabrera
DOI:10.1002/ejic.202100634
日期:2021.10.14
lifetimes that depend on the nature of the P,P ligand. The photocatalytic performance of copper(I) complexes C1-5 was evaluated for their use as photoredox catalysts in ATRA reactions, decarboxylative coupling and an Appel-type reaction. The use of readily available dpa as N,N ligand constitutes an attractive alternative to the well-established phenanthroline ligands typically used in photocatalysis.