Filters

2020 - 20212

More filters

2021 - 20222
Reset filters

Settings

Version: publishedVersion × Subject: cross-coupling ×

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Phenazine Radical Cations as Efficient Homogeneous and Heterogeneous Catalysts for the Cross-Dehydrogenative Aza-Henry Reaction
    (New York, NY : Wiley-VCH, 2020) Unglaube, Felix; Hünemörder, Paul; Guo, Xuewen; Chen, Zixu; Wang, Dengxu; Mejía, Esteban
    The redox activity of molecular phenazine catalysts has been previously exploited for aerobic oxidative amine homo- and cross-coupling reactions. In this contribution, we have extended the reaction scope of this novel type of organocatalyst and used them in the cross-dehydrogenative aza-Henry coupling of isoquinolines with nitromethane under aerobic conditions. Additionally, we have designed and prepared a novel porous organic polymer by cross-linking of tetrakis(4-bromophenyl)silane and dihydrophenazine through Pd-catalyzed Buchwald-Hartwig cross-coupling. This new type of heterogeneous catalyst, apart from being robust and easily reusable, also showed outstanding catalytic activities and improved selectivity compared to its molecular counterpart. A plausible reaction mechanism was proposed based on spectroscopic and kinetic measurements. © 2020 The Authors. Helvetica Chimica Acta published by Wiley-VHCA AG, Zurich, Switzerland
  • Thumbnail Image
    Item
    2,4-Bis(arylethynyl)-9-chloro-5,6,7,8-tetrahydroacridines: synthesis and photophysical properties
    (Frankfurt, M. : Beilstein-Institut zur Förderung der Chemischen Wissenschaften, 2021) Tka, Najeh; Ayed, Mohamed Adnene Hadj; Braiek, Mourad Ben; Jabli, Mahjoub; Chaaben, Noureddine; Alimi, Kamel; Jopp, Stefan; Langer, Peter
    Acridine derivatives have attracted considerable interest in numerous areas owing to their attractive physical and chemical properties. Herein, starting from readily available anthranilic acid, an efficient synthesis of 2,4-bis(arylethynyl)-9-chloro-5,6,7,8-tetrahydroacridine derivatives was accomplished via a one-pot double Sonogashira cross-coupling method. The UV-visible absorption and emission properties of the synthesized molecules have been examined. Additionally, theoretical studies based on density functional theory (DFT/B3LYP/6-31G(d)) were carried out.