Ligand-Free Iron-Catalyzed Carbon (sp<sup>2</sup>)–Carbon (sp<sup>2</sup>) Oxidative Homo-Coupling of Alkenyllithiums
作者:Zhuliang Zhong、Zhi-Yong Wang、Shao-Fei Ni、Li Dang、Hung Kay Lee、Xiao-Shui Peng、Henry N. C. Wong
DOI:10.1021/acs.orglett.8b03893
日期:2019.2.1
and hexa-substituted 1,3-butadienes. This one-pot procedure involves lithium–iodine exchange to generate the corresponding vinyllithium intermediates. A subsequent iron-catalyzed ligand-free oxidativehomo-coupling eventually led to the formation of 1,3-butadienes in acceptable to excellent isolated yields.
Photochemical Synthesis of 1,4-Dicarbonyl Bifluorene Compounds via Oxidative Radical Coupling Using TEMPO as the Oxygen Atom Donor
作者:Jincheng Xu、Aishun Ding、Yanbin Zhang、Hao Guo
DOI:10.1021/acs.joc.0c02781
日期:2021.2.19
visible-light-induced metal-free synthesis of 1,4-dicarbonyl compounds from alkyne-containing aryl iodides via photochemical C–I bond cleavage, intramolecular cyclization, oxidation, and intermolecular radical coupling sequence is reported. TEMPO was employed as the oxygen atom donor in this transformation. This protocol provided a new strategy for the synthesis of 1,4-dicarbonyl bifluorene compounds.
Cyclic Diaryl λ3‐Bromanes as a Precursor for Regiodivergent Alkynylation Reactions
作者:Maxime De Abreu、Torben Rogge、Matteo Lanzi、Tomas J. Saiegh、Kendall N. Houk、Joanna Wencel‐Delord
DOI:10.1002/anie.202319960
日期:2024.4.15
Regiodivergent reactions are a fascinating tool to rapidly access molecular diversity. Herein we reported the complemental character of hypervalent bromines, as aryne precursors and their behavior under transition metal-catalyzed reactions to furnish both ortho- and meta-substituted alkynylation products. Mechanistic and computational studies show how these selectivities are controlled.