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.
An unprecedented Cu-catalyzed stereoselective alkylhydrazination reaction involving terminal alkynes, azocarboxylic esters as a nitrogen source, and dimethyl 2,2'-azobis(2-methylpropionate) and its analogues as a carbon source is presented here. This protocol provides direct access to tri-substituted (E)-alkenyl-hydrazines with good regio- and stereoselectivity under mild conditions. The transformation
via AlCl3-mediated cyclization reaction and I2-promoted sequential oxidation reaction of 2-aminobenzenethiols with arylacetonitriles was developed. This reaction proceeds smoothly with a wide range of arylacetonitriles containing different functional groups to give the corresponding products in moderate to good yields under mild conditions. Moreover, this reaction was conveniently conducted on a gram
开发了一种有效的一锅法,通过AlCl 3介导的环化反应和 I 2促进的 2-氨基苯硫醇与芳基乙腈的顺序氧化反应获得 2-酰基苯并噻唑。该反应与各种含有不同官能团的芳基乙腈一起顺利进行,在温和的条件下以中等至良好的收率得到相应的产物。此外,该反应方便地以克规模进行,产率仍高达68%。
A General Acid‐Mediated Hydroaminomethylation of Unactivated Alkenes and Alkynes
作者:Daniel Kaiser、Veronica Tona、Carlos R. Gonçalves、Saad Shaaban、Alberto Oppedisano、Nuno Maulide
DOI:10.1002/anie.201906910
日期:2019.10.7
its considerable potential to streamline amine synthesis. State-of-the-art protocols for hydroaminomethylation of alkenes rely largely on transition-metal catalysis, enabling this transformation only under highly designed and controlled conditions. Here we report a broadly applicable, acid-mediated approach to the hydroaminomethylation of unactivated alkenes and alkynes. This methodology employs cheap
Visible-light-activated copper(<scp>i</scp>) catalyzed oxidative C<sub>sp</sub>–C<sub>sp</sub> cross-coupling reaction: efficient synthesis of unsymmetrical conjugated diynes without ligands and base
A novel visible-light-promoted copper-catalysed process for highly selective Csp-Csp cross-coupling reaction of terminal alkynes at room temperature is described. The current photochemical method is simple, high functional group compatible, and...