PNA bearing 5-azidomethyluracil: a novel approach for solid and solution phase modification

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Biochemistry

Background:

• Peptide nucleic acids (PNA) are DNA/RNA mimics with potential therapeutic applications.
• Developing efficient synthetic routes for modified PNAs is crucial for expanding their utility.
• Introducing functional groups onto PNA requires versatile monomer building blocks.

Purpose of the Study:

• To synthesize Fmoc- and Boc-protected modified monomers containing 5-azidomethyluracil.
• To evaluate different solid-phase synthetic strategies for incorporating these monomers into PNA.
• To explore the utility of the azide group for post-synthetic modification of PNA.

Main Methods:

• Synthesis of Fmoc- and Boc-protected 5-azidomethyluracil monomers.
• Testing four distinct solid-phase synthetic strategies for PNA assembly.
• Utilizing azide-alkyne click cycloaddition for PNA modification.

Main Results:

• Successful synthesis of the modified monomers.
• Demonstration of their applicability in solid-phase PNA synthesis.
• The azide group served as a masked amine for amide-linked functionalization.
• The azide group enabled PNA modification in solution via click chemistry.

Conclusions:

• The developed monomers are suitable for solid-phase PNA synthesis.
• The azide functionality provides a versatile platform for creating PNA libraries and modifications.
• This approach facilitates the production of diverse functionalized PNA compounds.