From polyesters to polyamides via O-N acyl migration: an original multi-transfer reaction

Area of Science:

• Polymer Chemistry
• Organic Synthesis
• Biomaterials

Background:

• Polyamides and polyesters are crucial polymers with diverse applications.
• Existing synthesis methods can be limited in scope or require harsh conditions.
• Hydroxyl-containing amino acids offer unique functionalities for polymer design.

Purpose of the Study:

• To develop a novel strategy for synthesizing polyamides from polyesters.
• To utilize a multi O-N acyl transfer reaction for polymer transformation.
• To demonstrate the synthesis of multiple polymer generations from a single amino acid-derived monomer.

Main Methods:

• Synthesis of Z-protected polyesters from N-benzyloxycarbonyl-serine and its derivatives.
• Deprotection to yield water-soluble polycationic polyesters.
• Base-induced multi O-N acyl transfer for polyamide formation in aqueous or organic media.
• Monitoring reaction progress using NMR spectroscopy and IR band analysis.

Main Results:

• Successfully synthesized three generations of polymers from a single starting monomer.
• Achieved polyamide synthesis via a multi O-N acyl transfer reaction.
• Demonstrated the versatility of the method in both aqueous and organic solvents.
• Confirmed polyester-to-polyamide conversion through spectroscopic analysis.

Conclusions:

• The developed multi O-N acyl transfer strategy provides an efficient route to polyamides from polyesters.
• This method allows for the sequential synthesis of different polymer types from the same precursor.
• The approach is adaptable to various conditions, including aqueous media, highlighting its potential for green chemistry.