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
Catalytic and direct methyl sulfonylation of alkenes and alkynes using a methyl sulfonyl radical generated from a DMSO, dioxygen and copper system
作者:Yaojia Jiang、Teck-Peng Loh
DOI:10.1039/c4sc01901f
日期:——
This paper describes an efficient method to β-keto methyl sulfones and (E)-vinyl methyl sulfones using DMSO as the substrate. The methyl sulfonyl radical generated from DMSO in the presence of catalytic Cu(I) under O2 atmosphere is believed to be involved in this reaction. Isotopic labeling and 18O2 experiments were performed to investigate the reaction mechanism.
本文介绍了一种有效的方法,以DMSO为底物,制备β-酮甲基砜和(E)-乙烯基甲基砜。据信在O 2气氛下在催化性Cu(I)存在下由DMSO产生的甲基磺酰基自由基参与了该反应。进行同位素标记和18 O 2实验以研究反应机理。
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.
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。
Direct C–H Methylsulfonylation of Alkenes with the Insertion of Sulfur Dioxide
methylsulfonylation of alkenes using inorganic sodium metabisulfite as the sulfurdioxide surrogate is described. This method provides convenient access to (E)-2-methyl styrenyl sulfones in good yields. In general, the in situ generated methyl radical from di-tert-butyl peroxide undergoes a methylsulfonylation process with the combination of sulfurdioxide.