4.5 Article

Access to Electron-Rich Dibenzofurans through NBu4OAc-Mediated Palladium Catalysis

Journal

EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 26, Issue 44, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.202300790

Keywords

Dibenzofuran; palladium; catalysis, tetraalkylammonium salt; electron-rich

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Dibenzofuran and its derivatives are important medicinal and natural products, but their synthesis is challenging. This study reports a new C-H functionalization method that works with electron-rich arenes, using tetrabutylammonium acetate as the catalyst, achieving efficient synthesis.
Dibenzofuran and its derivatives are ubiquitous and important medicinal and natural products. Many contain electron-rich aryl rings. Forming the key intramolecular Ar-Ar bond using traditional cross-coupling is difficult. The C-H functionalisation (C-H activation) approach is, in principle, far more useful. However, we previously found that the well-established conditions, which promote C-H functionalisation through Concerted Metalation-Deprotonation (CMD), proved unsatisfactory. Herein, we report a Pd-catalysed C-H functionalisation protocol that works with electron-rich arenes. We use tetrabutylammonium acetate (NBu4OAc), which we suspect can act as base, ligand and solvent, rendering this protocol a simple and efficient route to electron-rich dibenzofurans.

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