Robust Cobalt Catalyst for Nitrile/Alkyne [2+2+2] Cycloaddition: Synthesis of Polyarylpyridines and Their Mechanochemical Cyclodehydrogenation to Nitrogen-Containing Polyaromatics**

Chang Sheng Wang, Qiao Sun, Felipe García, Chen Wang, Naohiko Yoshikai

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The transition-metal-catalyzed [2+2+2] cycloaddition of nitriles and alkynes is an established synthetic approach to pyridines; however, these cycloadditions often rely on the use of tethered diynes or cyanoalkynes as one of the reactants. Thus, examples of efficient, fully intermolecular catalytic [2+2+2] pyridine synthesis, especially those employing unactivated nitriles and internal alkynes leading to pentasubstituted pyridines, remain scarce. Herein, we report on simple and inexpensive catalytic systems based on cobalt(II) iodide, 1,3-bis(diphenylphosphino)propane, and Zn that promote [2+2+2] cycloaddition of various nitriles and diarylacetylenes for the synthesis of a broad range of polyarylated pyridines. DFT studies support a reaction pathway involving oxidative coupling of two alkynes, insertion of the nitrile into a cobaltacyclopentadiene, and C-N reductive elimination. The resulting tetra- and pentaarylpyridines serve as precursors to hitherto unprecedented nitrogen-containing polycyclic aromatic hydrocarbons via mechanochemically assisted multifold reductive cyclodehydrogenation.

Original languageEnglish
Pages (from-to)9627-9634
Number of pages8
JournalAngewandte Chemie - International Edition
Volume60
Issue number17
DOIs
Publication statusPublished - 2021 Apr 19
Externally publishedYes

Keywords

  • cycloaddition
  • homogeneous catalysis
  • mechanochemistry
  • polycyclic aromatic compounds
  • pyridines

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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