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Nickel-Catalyzed Intermolecular Cyclization of 2-Bromobenzamide: A General Strategy for Synthesizing

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|April 14, 2026
PubMed
Summary

A new nickel-catalyzed method efficiently synthesizes 6(5H)-phenanthridinone derivatives from 2-bromobenzamides. This strategy provides a versatile route to various amide-substituted compounds for drug development and materials science.

Keywords:
2-bromobenzanilideintermolecular cyclizationnickel catalysisphenanthridinone

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Materials Science

Background:

  • 6(5H)-phenanthridinone derivatives are valuable alkaloids with applications in drug development and functional materials.
  • Existing synthetic methods may lack efficiency or versatility for constructing diverse derivatives.

Purpose of the Study:

  • To develop a novel nickel-catalyzed synthetic strategy for 6(5H)-phenanthridinone derivatives.
  • To efficiently construct amide-substituted 6(5H)-phenanthridinone compounds.
  • To explore the substrate scope and scalability of the developed method.

Main Methods:

  • A nickel-catalyzed intermolecular cyclization reaction using 2-bromobenzamide starting materials.
  • Optimization of reaction conditions including catalyst (Ni(acac)2/Zn), ligand (PCy3), solvent (toluene), base (Cs2CO3), temperature (150 °C), and time (12 h).
  • Substrate scope exploration and gram-scale synthesis validation.

Main Results:

  • Efficient synthesis of 6(5H)-phenanthridinone derivatives with yields up to 88% under optimized conditions.
  • Successful synthesis of 21 derivatives with diverse substitution patterns (51-92% yields) and good functional group compatibility.
  • Demonstrated scalability with an 85% yield in gram-scale experiments.

Conclusions:

  • The developed nickel-catalyzed method provides a precise and efficient approach for constructing the 6(5H)-phenanthridinone framework.
  • This strategy offers an effective pathway for the controlled synthesis of amide-substituted derivatives with potential applications in pharmaceuticals and materials.