Catalytic Ullmann-Type N-Arylation to Access Medicinally Important SuFEx-able Pyrazolo[1,5-a]Quinoxalinones

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Heterocyclic Chemistry

Background:

• Pyrazole-fused quinoxalines are important scaffolds in medicinal chemistry.
• Development of novel synthetic methodologies is crucial for accessing diverse chemical structures.

Purpose of the Study:

• To develop a concise synthetic route to a new class of pyrazolo[1,5-a]quinoxaline-4-ones.
• To incorporate sulfur(IV) fluoride exchange (SuFEx) chemistry for facile diversification.

Main Methods:

• A novel synthetic methodology was employed for the preparation of pyrazolo[1,5-a]quinoxaline-4-ones.
• Sulfonyl fluoride incorporation enabled SuFEx chemistry.

Main Results:

• A new class of pyrazolo[1,5-a]quinoxaline-4-ones was synthesized efficiently.
• The methodology allows for rapid diversification of the fused heterocycle core.

Conclusions:

• This synthetic approach provides a powerful strategy for expanding chemical space.
• The developed compounds hold potential for the discovery of novel bioactive molecules.