Heterobiaryl synthesis by contractive C-C coupling via P(V) intermediates.

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• Heterobiaryls containing pyridine and diazine rings are crucial in pharmaceuticals.
• Metal-catalyzed cross-coupling is the standard method for synthesizing heterobiaryls.

Purpose of the Study:

• To present a novel, metal-free approach for synthesizing heterobiaryls.
• To utilize contractive phosphorus C-C couplings (phosphorus ligand coupling) as an alternative strategy.

Main Methods:

• Regioselective phosphorus substitution of C-H bonds para to nitrogen in heterocycles.
• Triggering ligand coupling using acidic alcohol solutions to form heterobiaryl bonds.

Main Results:

• Successful synthesis of heterobiaryls via phosphorus ligand coupling.
• Demonstrated applicability to complex, drug-like molecules with polar functional groups.
• Enabled convergent coupling of drug fragments and late-stage heteroarylation.

Conclusions:

• Phosphorus ligand coupling provides a versatile and efficient alternative to metal-catalyzed cross-coupling for heterobiaryl synthesis.
• This method is suitable for complex molecule synthesis and drug discovery applications.