Optimization and Automation of Helical Aromatic Oligoamide Foldamer Solid-Phase Synthesis

Area of Science:

• Organic Chemistry
• Supramolecular Chemistry
• Materials Science

Background:

• Helical aromatic oligoamides are promising foldamers with potential applications in various fields.
• Efficient synthesis of long oligoamide sequences has been a significant challenge.

Purpose of the Study:

• To develop and optimize solid-phase synthesis (SPS) protocols for preparing long helically folded oligoamides.
• To validate analytical methods for characterizing these complex molecules.
• To adapt SPS protocols for automated synthesis.

Main Methods:

• Optimized manual solid-phase synthesis (SPS) using 8-amino-2-quinolinecarboxylic acid units.
• Validation of analytical techniques including 1H NMR for purity and identification.
• Adaptation of SPS protocols for automated peptide synthesizers, employing in situ acid chloride activation under Appel's conditions.

Main Results:

• Successful preparation of helically folded oligoamides up to 41 units in length.
• Achieved high yields and purity, establishing new benchmarks for SPS efficiency.
• Validated 1H NMR as a reliable method for analyzing large oligoamide structures.
• Demonstrated efficient automation of SPS for long sequence production.

Conclusions:

• The developed SPS protocols are highly efficient for synthesizing long helical aromatic oligoamide foldamers.
• Automation of SPS represents a significant breakthrough, reducing labor and enabling scalable production.
• Validated analytical methods ensure reliable characterization of these complex foldamers.