Further optimization of detritylation in solid-phase oligodeoxyribonucleotide synthesis

Area of Science:

• Organic Chemistry
• Biochemistry
• Synthetic Biology

Background:

• Solid-phase synthesis of oligodeoxyribonucleotides relies on protecting groups for 5'-hydroxyl functions.
• The 4,4'-dimethoxytrityl (DMTr) group is commonly used but requires specific acidic conditions for removal (detritylation).
• Current detritylation methods may be harsh, limiting the incorporation of sensitive molecular components.

Purpose of the Study:

• To investigate optimal conditions for detritylation during oligonucleotide synthesis.
• To evaluate the efficacy of different acidic conditions for removing the DMTr protecting group.
• To propose an alternative protecting group for enhanced deprotection and broader synthetic applications.

Main Methods:

• Investigated various concentrations of dichloroacetic acid and trichloroacetic acid for DMTr group removal.
• Assessed the complete removal of the DMTr group under varied acidic conditions.
• Proposed and evaluated the 2,7-dimethylpixyl (DMPx) group as a more labile alternative.

Main Results:

• The DMTr group can be fully removed under significantly milder acidic conditions than currently employed.
• Optimized detritylation conditions were identified, reducing the harshness of the process.
• The 2,7-dimethylpixyl (DMPx) group shows promise as a readily removable alternative for 5'-OH protection.

Conclusions:

• Milder detritylation conditions for oligonucleotide synthesis are feasible, minimizing waste.
• The findings facilitate the incorporation of acid-sensitive building blocks into synthetic oligonucleotides.
• The proposed DMPx group offers a potentially superior alternative for 5'-OH protection in various synthesis formats.