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.
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 Photoexcitation of Xanthate Anions for Deoxygenative Alkenylation of Alcohols
作者:Hong-Mei Guo、Bin-Qing He、Xuesong Wu
DOI:10.1021/acs.orglett.2c00889
日期:2022.5.6
In this report, we identify xanthate salts as a unique class of visible-light-excitable alkyl radical precursors that act simultaneously as strong photoreductants and alkyl radical sources. Upon direct photoexcitation of xanthate anions, efficient deoxygenative alkenylation and alkylation of a wide range of primary, secondary, and tertiary alcohols have been achieved via a one-pot protocol, avoiding