Synthesis of Trinucleotide Building Blocks in Solution and on Solid Phase.

Area of Science:

• Organic Chemistry
• Nucleic Acid Chemistry
• Synthetic Chemistry

Background:

• Trinucleotide phosphoramidites are key intermediates in automated DNA synthesis.
• Efficient and reliable synthesis of these building blocks is crucial for advancing molecular biology and biotechnology.

Purpose of the Study:

• To develop novel methods for the synthesis of trinucleotide phosphoramidites.
• To provide accessible routes for both solution-phase and solid-phase synthesis of these important DNA building blocks.

Main Methods:

• Solution-phase synthesis utilizing orthogonal protecting groups (5'-O-dimethoxytrityl and 3'-O-tert-butyldimethylsilyl) and phosphate protection (2-cyanoethyl).
• Solid-phase synthesis employing standard phosphoramidite chemistry with a dithiomethyl linkage for nucleoside attachment to a polymer support.

Main Results:

• Successful synthesis of fully protected trinucleotides in solution, followed by 3'-O-protecting group cleavage and phosphitylation.
• Efficient release of trinucleotides from solid support under neutral conditions via disulfide bridge cleavage, preserving other protecting groups.

Conclusions:

• The developed methods provide facile access to trinucleotide phosphoramidites.
• These methods are compatible with automated solid-phase DNA synthesis, enabling efficient production of oligonucleotides.