Riminophenazine Derivatives as Potential Antituberculosis Agents: Synthesis, Biological, and Electrochemical...

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Antimicrobial Drug Discovery

Background:

• Tuberculosis remains a significant global health threat, necessitating the development of novel therapeutic agents.
• Riminophenazines are a class of compounds with known antimycobacterial properties, but their potential is yet to be fully explored.
• Understanding the structure-activity relationships of riminophenazine derivatives is crucial for optimizing anti-tuberculosis drug candidates.

Purpose of the Study:

• To design and synthesize novel riminophenazine derivatives with diverse structural modifications.
• To investigate the relationship between lipophilicity, redox potential, and antimycobacterial activity of these new compounds.
• To identify promising candidates for the development of new anti-tuberculosis agents.

Main Methods:

• Synthesis of novel riminophenazine derivatives with varied substituents at N-5, C-3, C-8, and pendant aryl groups.
• Evaluation of in vitro antimycobacterial activity against *Mycobacterium tuberculosis* H₃₇Rv.
• Assessment of mammalian cytotoxicity and determination of redox potentials using cyclic voltammetry.

Main Results:

• A series of novel riminophenazine derivatives were successfully synthesized.
• An activity
• cliff
• was observed with C-8 substitution, highlighting specific structural requirements for potent activity.
• Compounds 10l and 10m demonstrated significant antimycobacterial activity (MIC₉₉ ~1 µM) with favorable redox properties.

Conclusions:

• Novel riminophenazine derivatives with ionizable substituents show potential as anti-tuberculosis agents.
• Specific structural modifications, particularly at the C-8 position, are critical for enhancing antimycobacterial efficacy.
• The identified compounds represent a new class of riminophenazines warranting further investigation for tuberculosis therapy.