Multiple oligonucleotide synthesis in tandem on solid-phase supports for small and large scale synthesis

Area of Science:

• Oligonucleotide synthesis
• Chemical biology
• Molecular biology

Background:

• Oligonucleotides are crucial for molecular biology and therapeutics.
• Efficient synthesis of long or tandem oligonucleotides remains a challenge.
• Current methods may produce unwanted byproducts or require complex steps.

Purpose of the Study:

• To develop a robust method for synthesizing multiple oligonucleotides linked in tandem.
• To improve the purity and yield of synthesized oligonucleotide chains.
• To establish versatile starting materials and coupling strategies for oligonucleotide synthesis.

Main Methods:

• Nucleoside addition to the 5'-OH end of a growing oligonucleotide chain.
• Coupling of nucleosides with 3'-succinyl or Q-Linker arms using HBTU/DMAP.
• Utilizing novel phosphoramidite reagents featuring 3'-ester linkages.
• Employing hydroxyl or amino supports as universal starting points.
• Ammonium hydroxide treatment to cleave the 3'-ester and generate 3'-OH termini.

Main Results:

• Successful synthesis of multiple oligonucleotides linked end-to-end.
• Demonstrated efficient coupling using both linker arms and phosphoramidite reagents.
• Established hydroxyl and amino supports as effective universal starting materials.
• Achieved selective cleavage of the 3'-ester, yielding pure 3'-OH groups.
• Avoided the formation of unwanted 3'-phosphorylated byproducts.

Conclusions:

• A versatile and efficient method for synthesizing tandem oligonucleotides has been established.
• The use of novel reagents and supports simplifies the process and enhances product purity.
• This approach offers a reliable strategy for producing complex oligonucleotide constructs for various applications.