Synthesis of 3-Functionalized 4-Quinolones from Readily Available Anthranilic Acids

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Synthetic Chemistry

Background:

• 4-quinolones are privileged pharmacophores in numerous biologically active compounds.
• Efficient synthesis of functionalized 4-quinolones is crucial for drug discovery and development.

Purpose of the Study:

• To report an efficient synthesis of 3-functionalized 4-quinolones.
• To provide a practical and scalable method for accessing diverse functionalized 4-quinolone scaffolds.

Main Methods:

• A telescoped two-step synthetic sequence.
• Utilized readily available anthranilic acids and functionalized methane derivatives (e.g., methyl sulfones, methyl ketones, acetonitrile).

Main Results:

• Achieved good to excellent yields for a variety of structurally diverse 3-functionalized 4-quinolones.
• Demonstrated good functional group tolerability under mild reaction conditions.

Conclusions:

• The disclosed method offers a highly efficient and practical entry to functionalized 4-quinolones.
• The synthesis is amenable to preparative-scale production, facilitating further research and development.