Blue LED Irradiation of Iodonium Ylides Gives Diradical Intermediates for Efficient Metal‐free Cyclopropanation with Alkenes
作者:Tristan Chidley、Islam Jameel、Shafa Rizwan、Philippe A. Peixoto、Laurent Pouységu、Stéphane Quideau、W. Scott Hopkins、Graham K. Murphy
DOI:10.1002/anie.201908994
日期:2019.11.18
A facile and highly chemoselective synthesis of doubly activated cyclopropanes is reported where mixtures of alkenes and β-dicarbonyl-derived iodoniumylides are irradiated with light from blue LEDs. This metal-free synthesis gives cyclopropanes in yields up to 96 %, is operative with cyclic and acyclic ylides, and proceeds with a variety of electronically-diverse alkenes. Computational analysis explains
A novel method for selective generation of aryl radicals from diaryliodonium salts and iodanylidene malonates with sodium 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPONa) as a single‐electron transfer (SET) reducing reagent is described. In the presence of various alkenes, aryl radicals formed after SET‐reduction of hypervalent iodine compounds undergo alkene addition and the adduct radicals that are
A sustainable C–H functionalization of indoles, pyrroles and furans under a blue LED with iodonium ylides
作者:Saibal Sar、Ranajit Das、Dhiraj Barman、Pikaso Latua、Souvik Guha、Ludovic Gremaud、Subhabrata Sen
DOI:10.1039/d1ob01219c
日期:——
Pyrrole and indole derivatives are functionalized via a green initiative with the dimethylmalonate derived phenyl iodonium ylide 4a in the presence of a blue LED via C–H functionalization of the respective heterocycles in methanol to generate the desired compounds 5–7 in moderate to good yields. Control experiments provide insight into the probable reaction mechanism. Finally, the strategy is successfully
吡咯和吲哚衍生物通过绿色倡议与丙二酸二甲酯衍生的苯基碘鎓叶立德4a在蓝色 LED 存在下通过甲醇中各自杂环的 C-H 官能化进行官能化,以中等至良好的产率生成所需的化合物5-7 . 对照实验提供了对可能反应机制的深入了解。最后,该策略成功应用于azepino[4,5- b ]indole 12a / b的生成。
Catalyst-Free, Multicomponent Reaction of Iodonium Ylides, Nitrosoarenes, and Olefins for the Synthesis of Isoxazolidine Derivatives
作者:Lei Li、Jun Xuan、Yan-Rui Zhao
DOI:10.1055/a-2107-5567
日期:2023.10
of nitrosoarenes, olefins, as well as iodonium ylides can be subjected to this reaction to generate the N-aryl isoxazolidines derivatives with moderate to excellent yields. In addition, we demonstrate that this approach employs the 1,3-dipolar cycloaddition of nitrones generated in situ from iodonium ylides and nitroso compounds, with olefins in the absence of any catalysts and additives.