Functionalised bicyclic tetramates derived from cysteine as antibacterial agents

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Microbiology

Background:

• The rise of antibiotic resistance necessitates the development of novel antibacterial agents.
• Heterocyclic scaffolds offer diverse structural possibilities for drug discovery.
• Cysteine-derived molecules present a versatile platform for chemical modification.

Purpose of the Study:

• To synthesize novel bicyclic tetramates derived from cysteine.
• To evaluate the antibacterial activity of these compounds against Gram-positive bacteria.
• To investigate their potential as inhibitors of bacterial gyrase and RNA polymerase.

Main Methods:

• Synthesis of bicyclic tetramates incorporating functional groups at two distinct positions.
• Incorporation of glycosyl side chains to enhance polarity and aqueous solubility.
• Assays for antibacterial activity and enzyme inhibition (gyrase, RNA polymerase).

Main Results:

• Successful synthesis of bicyclic tetramates with modifiable peripheral functionality.
• Identification of compounds exhibiting significant activity against Gram-positive bacteria.
• Two glycosylated tetramates demonstrated high antibacterial efficacy with moderate enzyme inhibition.

Conclusions:

• Bicyclic tetramates derived from cysteine are readily accessible and versatile scaffolds.
• These compounds represent a promising class of antibacterials, with potential mechanisms involving gyrase and RNA polymerase inhibition.
• Physicochemical property analysis (MW, clogD7.4, PSA) correlates with antibacterial activity, guiding future drug design.