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This study details palladium-catalyzed C-H activation and functionalization of 4-arylpyrimidines. These reactions enable efficient synthesis of diverse arylpyrimidines and demonstrate scalability for broader applications.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Palladium-catalyzed C-H activation offers a powerful strategy for direct functionalization of heterocycles.
  • 4-Arylpyrimidines are important scaffolds in medicinal chemistry and materials science.
  • Efficient and regioselective methods for modifying these structures are highly desirable.

Purpose of the Study:

  • To develop regioselective palladium-catalyzed C-H activation and functionalization reactions for 4-arylpyrimidines.
  • To explore arylation, iodination, and acetoxylation reactions.
  • To demonstrate subsequent cross-coupling reactions and assess the scalability of the developed methods.

Main Methods:

  • Regioselective C-H activation/arylation using aryl iodides.
  • Regioselective C-H iodination using N-iodosuccinimide.
  • Regioselective C-H acetoxylation using (diacetoxyiodo)benzene.
  • Palladium catalysis was employed for all transformations.
  • Subsequent Suzuki-Miyaura coupling and Sonogashira reactions were performed on the iodinated products.

Main Results:

  • Successful regioselective C-H activation and functionalization of 4-arylpyrimidines were achieved.
  • Aryl iodides, N-iodosuccinimide, and (diacetoxyiodo)benzene served as effective coupling partners.
  • The resulting aryl iodides underwent efficient Suzuki-Miyaura coupling and Sonogashira reactions.
  • The C-H activation/functionalization process demonstrated scalability, starting from accessible 4-aryl pyrimidines.

Conclusions:

  • Developed a versatile palladium-catalyzed C-H activation/functionalization platform for 4-arylpyrimidines.
  • The methodology allows for regioselective arylation, iodination, and acetoxylation.
  • The approach is amenable to further diversification via established cross-coupling reactions.
  • The scalability of the process highlights its potential for practical synthesis.