Eight-Membered Palladacycle Intermediate Enabled Synthesis of Cyclic Biarylphosphonates

Area of Science:

• Organic Chemistry
• Catalysis
• Organophosphorus Chemistry

Background:

• Transition-metal-catalyzed coupling reactions are key for C-C bond formation.
• Direct C-H bond functionalization offers efficient synthetic routes.
• Triaryl phosphates are versatile precursors in organic synthesis.

Purpose of the Study:

• To develop a novel palladium-catalyzed intramolecular C-H arylation of triaryl phosphates.
• To synthesize seven-membered cyclic biarylphosphonate compounds.
• To explore the utility of the synthesized compounds.

Main Methods:

• Palladium-catalyzed intramolecular C-H bond arylation.
• Utilizing triaryl phosphates as substrates.
• Formation of an eight-membered palladacyclic intermediate.

Main Results:

• Successful synthesis of seven-membered cyclic biarylphosphonates.
• Demonstrated good functional group compatibility.
• Products are readily convertible to other valuable phosphate derivatives.

Conclusions:

• A novel and efficient palladium-catalyzed method for synthesizing cyclic biarylphosphonates has been established.
• The reaction proceeds through a unique eight-membered palladacyclic intermediate.
• The synthesized compounds serve as versatile building blocks for further chemical transformations.