Unlocking P(V): Reagents for chiral phosphorothioate synthesis

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Nucleic Acid Chemistry

Background:

• Phosphorothioate nucleotides are vital analogs of native phosphodiesters with applications in antisense oligonucleotide (ASO) therapeutics and cyclic dinucleotide (CDN) synthesis.
• Current methods for stereocontrolled synthesis of phosphorothioates rely on phosphorus(III) reagents, limiting efficiency and control.

Purpose of the Study:

• To introduce a novel phosphorus(V)-based reagent platform for the stereocontrolled synthesis of phosphorothioate nucleotides.
• To demonstrate a programmable, traceless, and diastereoselective method for phosphorus-sulfur incorporation.

Main Methods:

• Development of a new phosphorus(V)-based reagent system for nucleoside modification.
• Application of the reagent system to the synthesis of various nucleotidic architectures, including ASOs and CDNs.
• Stereochemical analysis and validation of the synthesized compounds.

Main Results:

• Successful demonstration of a P(V)-based platform for programmable, traceless, and diastereoselective phosphorus-sulfur incorporation.
• Robust and stereocontrolled synthesis of diverse nucleotidic structures, including ASOs and CDNs.
• The developed protocol is efficient, inexpensive, and operationally simple.

Conclusions:

• The novel P(V)-based reagent platform provides a significant advancement in the stereocontrolled synthesis of phosphorothioate nucleotides.
• This method overcomes limitations of P(III)-based approaches, offering a more accessible route for therapeutic oligonucleotide and CDN development.
• The protocol's efficiency and simplicity facilitate broader applications in pharmaceutical research and development.