Cyanostilbenes as Selective Chloride Carriers Relying on CH-anion Interactions

Area of Science:

• Supramolecular Chemistry
• Chemical Biology
• Medicinal Chemistry

Background:

• Developing selective anion receptors for transmembrane transport is challenging.
• Common receptors rely on NH-based hydrogen bonds, but larger designs or alternative motifs are needed.
• This study explores CH-based hydrogen bonds for small, efficient anion receptor design.

Purpose of the Study:

• To design and synthesize novel small molecule chloride receptors utilizing CH-based hydrogen bonds.
• To investigate the impact of substituents on receptor affinity, selectivity, and transport rates.
• To evaluate the potential of these receptors for therapeutic applications in chloride channelopathies.

Main Methods:

• Synthesis of α-cyanostilbene-based compounds with varying substituents.
• Evaluation of chloride binding affinity using spectroscopic methods.
• Measurement of transmembrane chloride transport rates.
• Assessment of selectivity against other anions (hydroxide, bicarbonate, fluoride).

Main Results:

• A specific α-cyanostilbene derivative with four trifluoromethyl groups and a nitro group showed high affinity for chloride.
• This compound demonstrated the fastest chloride transport rates among those tested, exceeding triazole-based receptors.
• Excellent selectivity for chloride transport over other tested anions was observed.

Conclusions:

• Small molecule receptors based on α-cyanostilbenes and CH-based hydrogen bonds are effective for selective chloride transport.
• The lead compound exhibits superior performance and selectivity, making it a promising therapeutic candidate.
• This research opens new avenues for developing treatments for diseases associated with chloride ion channel dysfunction.