Novel C-7 carbon substituted fourth generation fluoroquinolones targeting N. Gonorrhoeae infections

Area of Science:

• Medicinal Chemistry
• Antimicrobial Drug Discovery

Background:

• Delafloxacin, a fourth-generation fluoroquinolone, has broad-spectrum activity but faced efficacy issues in treating Neisseria gonorrhoeae.
• There is a need for novel antimicrobial agents with improved efficacy and safety profiles.

Purpose of the Study:

• To develop and characterize novel delafloxacin analogues with a nitrogen-for-carbon swap at the C7 position.
• To evaluate the antibacterial activity and physicochemical properties of these new compounds.

Main Methods:

• Synthesis of delafloxacin carbon analogues via a nitrogen-for-carbon swap.
• Microbiological profiling against Gram-positive, Gram-negative bacteria, including Neisseria gonorrhoeae.
• Assessment of physicochemical properties and ADMET (Absorption, Distribution, Metabolism, Excretion, Toxicity) profiles.

Main Results:

• The novel delafloxacin analogues retained significant activity against Neisseria gonorrhoeae and other key bacterial pathogens.
• A differentiated physicochemical profile was observed for the modified compounds.
• A zwitterionic derivative showed enhanced activity against Gram-negative strains with favorable ADMET properties.

Conclusions:

• The C7 nitrogen-for-carbon modification represents a viable strategy for developing new delafloxacin-based antibiotics.
• These analogues demonstrate potential as next-generation agents for bacterial infections, including those caused by N. gonorrhoeae.