Recoverable low fluorine content palladium complex-catalyzed Suzuki-Miyaura and Sonogashira coupling reactions under thermomorphic mode

Eskedar Tessema, Yao Wen Fan, Chiao Fan Chiu*, Vijayanath Elakkat, Hening Asti Rahayu, Chia Rui Shen, Karthik Chimatahalli Shanthakumar, Peng Zhang, Norman Lu*

*Corresponding author for this work

Research output: Contribution to journalJournal Article peer-review

6 Scopus citations

Abstract

The reaction of [PdCl2(CH3CN)2] and bis-5,5'-(RfCH2OCH2)-2,2′-bpy (1), where Rf = n-C4F8H, in the presence of dichloromethane (CH2Cl2) resulted in the synthesis of low fluorine content Pd complex, [PdCl2 [5,5′-bis-(RfCH2OCH2)-2,2′-bpy] (2). The Pd-catalyzed Suzuki-Miyaura and Sonogashira coupling reactions of several aryl halides with their respective reagents were selected to demonstrate the feasibility of catalytic activity and recycling usage with 2 as the catalyst by using dibutyl ether (DBE) as the solvent at 140–145 °C under the thermomorphic mode. The Pd complex 2-catalyzed Suzuki-Miyaura reactions of different aryl iodides with phenylboronic acid derivatives have showed good recycling results though its activity was observed to decrease after the fifth cycle. Similarly, 2-catalyzed Sonogashira reactions of several aryl iodides with phenyl acetylene have also displayed good recycling results for a total of up to 8 cycles, with a high yield and TON. The electronic effect studies from substituents in both Suzuki-Miyaura and Sonogashira coupling reactions showed that electron withdrawing groups on the aryl iodide speed up the reaction rate. Furthermore, the catalytic activity of the Pd complex (2) showed a better result with the more reactive aryl iodide compared to the less reactive aryl bromide and chloride. To our knowledge, this is the first example of recoverable low fluorine content Pd-catalyzed Suzuki-Miyaura and Sonogashira reactions under the thermomorphic mode.

Original languageEnglish
Article number132961
JournalTetrahedron
Volume122
DOIs
StatePublished - 10 09 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier Ltd

Keywords

  • Catalysis
  • Coupling
  • Homogeneous
  • Low fluorine content catalyst
  • Palladium
  • Recovery
  • Sonogashira
  • Suzuki-miyaura
  • Thermomorphic

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