Ammonium iodide-induced sulfonylation of alkenes with DMSO and water toward the synthesis of vinyl methyl sulfones
作者:Xiaofang Gao、Xiaojun Pan、Jian Gao、Huawen Huang、Gaoqing Yuan、Yingwei Li
DOI:10.1039/c4cc07606k
日期:——
A novel ammonium iodide-induced sulfonylation of alkenes with DMSO and water toward the synthesis of vinyl methylsulfones is described. The process proceeded smoothly under metal-free conditions with high stereoselectivity and good functional group tolerance. The reaction mechanism was revealed to proceed through a domino reaction of oxidation and elimination after the radical addition to alkenes
CuSO<sub>4</sub>·5H<sub>2</sub>O-<i>H</i>-Phosphonate-Catalyzed Intermolecular C-S Bond Formation: Synthesis of (<i>E</i>)-Vinyl Alkylsulfones from Alkynes and DMSO
A CuSO4·5H2O-H-phosphonate-catalyzedsynthesis of (E)-vinylalkylsulfonesfromalkynes and widely available DMSO was developed. The present protocol provides an alternative approach to various vinyl sulfones, with the advantages of cheap catalysts, readily available starting materials, operational simplicity and high stereo- and regioselectivity.
Eosin Y (EY) Photoredox-Catalyzed Sulfonylation of Alkenes: Scope and Mechanism
作者:Andreas Uwe Meyer、Karolína Straková、Tomáš Slanina、Burkhard König
DOI:10.1002/chem.201601000
日期:2016.6.13
Alkyl‐ and aryl vinyl sulfones were obtained by eosin Y (EY)‐mediated visible‐light photooxidation of sulfinate salts and the reaction of the resulting S‐centered radicals with alkenes. Optimized reaction conditions, the sulfinate and alkene scope, and X‐ray structural analyses of several reaction products are provided. A detailed spectroscopic study explains the reactionmechanism, which proceeds
A photocatalyst-free visible-light-mediated solvent-switchable route to stilbenes/vinyl sulfones from β-nitrostyrenes and arylazo sulfones
作者:Ruchi Chawla、Shefali Jaiswal、P. K. Dutta、Lal Dhar S. Yadav
DOI:10.1039/d1ob01028j
日期:——
protocol for the arylation/sulfonylation of β-nitrostyrenes employing arylazo sulfones (bench-stable photolabile compounds) in a switchable solvent-controlled manner. Arylazo sulfones served as the aryl and sulfonyl radical precursors under blue LED irradiation for the synthesis of trans-stilbenes and (E)-vinylsulfones in CH3CN and dioxane/H2O 2 : 1, respectively. The absence of any metal, photocatalyst
无光催化剂的可见光介导反应基于起始材料本身中存在可见光吸收官能团,以排除通常昂贵、危险、可降解且难以去除或回收的光氧化还原催化剂。最近势头强劲。我们采用这种方法开发了一种无脱硝光催化剂可见光介导的协议,用于以可切换的溶剂控制方式使用芳基偶氮砜(实验室稳定的光不稳定化合物)对 β-硝基苯乙烯进行芳基化/磺酰化。芳基偶氮砜在蓝光 LED 照射下作为芳基和磺酰基自由基前体,用于在 CH 3 CN 和二恶烷/H 2 中合成反式二苯乙烯和 ( E )-乙烯基砜O 2 : 1,分别。不含任何金属、光催化剂和添加剂;优异的选择性(E-立体化学)和溶剂可转换性;可见光和环境温度的使用是所开发方法的主要资产。此外,我们报告了第一个无光催化剂的可见光驱动路线,从容易获得的 β-硝基苯乙烯合成二苯乙烯和乙烯基砜。
Photocatalyst-free visible light driven synthesis of (E)-vinyl sulfones from cinnamic acids and arylazo sulfones
作者:Ruchi Chawla、Shefali Jaiswal、P.K. Dutta、Lal Dhar S. Yadav
DOI:10.1016/j.tetlet.2020.151898
日期:2020.5
decarboxylative sulfono functionalization protocol has been explored for the synthesis of (E)-vinylsulfonesfrom cinnamic acids and bench-stable arylazo sulfones. The latter have been utilized as sulfonyl radical precursors under blue LED irradiation along with Cs2CO3, air and KI to obtain the vinyl aryl sulfones as well as vinyl alkyl sulfones in moderate to excellent yields. Besides the non-photocatalytic conditions
已经探索了一种无光催化剂的可见光介导的脱羧磺酰基官能化方案,用于从肉桂酸和稳定的芳基偶氮砜合成(E)-乙烯基砜。后者已与Cs 2 CO 3,空气和KI一起在蓝色LED辐射下用作磺酰基自由基前体,以中等至极好的收率获得了乙烯基芳基砜和乙烯基烷基砜。除了非光催化条件外,高生态可持续性,低成本,易于操作和易于获得乙烯基烷基砜等也是该开发方法必不可少的特性。