Metal Free Benzylation and Alkylation of Quinoxalin‐2(1
<i>H</i>
)‐ones with Alkenes Triggered by Sulfonyl Radical Generated from Sulfinic Acids
作者:Himangsu Sekhar Dutta、Ashfaq Ahmad、Afsar Ali Khan、Mohit Kumar、Raziullah、Dipankar Koley
DOI:10.1002/adsc.201901212
日期:2019.12.17
A metal‐free domino multicomponent reaction for the direct C−H benzylation and alkylation of quinoxalin‐2(1H)‐ones using alkenes is described. Triggered by the sulfonyl radical generated from sulfinic acid, the alkenes are transformed to alkyl radicals that react exclusively at the C‐3 position of quinoxalin‐2(1H)‐ones. Importantly, the method not only functionalizes medicinally important quinoxalin‐2(1H)‐one
initially the fabrication of a single-atom photocatalyst Ni/TiO2 for the visible-light-induced site-selective sulfonation of enamides to give amidosulfones with 36 examples up to 99% yield. The experimental results show that this single-atom photocatalyst Ni/TiO2 can achieve site-selective sulfonation of enamide to construct α-amidosulfones and β-propionamidosulfones under visible light. Importantly, such
单原子光催化作为一种重要的有机转化策略已受到越来越多的关注,其性能很大程度上取决于催化剂的设计。该方案最初涉及制造单原子光催化剂Ni / TiO 2,用于可见光诱导的酰胺的位点选择性磺化,以产生酰胺化砜,其中36个实例的收率高达99%。实验结果表明,该单原子光催化剂Ni / TiO 2可以在可见光下实现酰胺的定点磺化,从而构建α-酰胺基砜和β-丙酰胺基砜。重要的是,这种基于单原子光催化的合成系统显示出良好的可回收性,高周转数(最多18 963),对官能团的优异耐受性,并且可以容易地按比例放大并具有良好的效率。
Aqueous DMSO Mediated Conversion of (2-(Arylsulfonyl)vinyl)iodonium Salts to Aldehydes and Vinyl Chlorides
作者:Eman Zawia、Wesley Moran
DOI:10.3390/molecules21081073
日期:——
under-developed. Herein is described the solvolysis of some vinyl(phenyl)iodonium salts, bearing an arylsulfonyl group, in aqueous DMSO leading to aldehyde formation. This unusual process is selective and operates under ambient conditions. Furthermore, the addition of aqueous HCl and DMSO to these vinyl(aryl)iodonium salts allows their facile conversion to vinyl chlorides.
A novel and efficient method for the selective synthesis of sulfinylated benzofulvenes has been developed through the BF3·Et2O-promoted electrophilic addition/cyclization of 1,3-enynes. This metal-free cascade reaction employs readily accessible arylsulfinic acids as sulfinyl cation sources at room temperature and provides a wide range of functionalized benzofulvenes in good to excellent yields under
通过BF 3 ·Et 2 O 促进的1,3-烯炔的亲电加成/环化,开发了一种选择性合成亚磺酰化苯并富烯的新型高效方法。这种无金属级联反应在室温下使用容易获得的芳基亚磺酸作为亚磺酰基阳离子源,并在温和条件下以良好到优异的产率提供广泛的官能化苯并富烯。
Markovnikov-Selective Radical Addition of S-Nucleophiles to Terminal Alkynes through a Photoredox Process
作者:Huamin Wang、Qingquan Lu、Chien-Wei Chiang、Yi Luo、Jiufu Zhou、Guangyu Wang、Aiwen Lei
DOI:10.1002/anie.201610000
日期:2017.1.9
Direct radical additions to terminal alkynes have been widely employed in organic synthesis, providing credible access to the anti‐Markovnikov products. Because of the Kharasch effect, regioselective control for the formation of Markovnikov products still remains a great challenge. Herein, we develop a transition‐metal‐free, visible light‐mediated radical addition of S‐nucleophiles to terminal alkynes