P-Stereodefined morpholino dinucleoside 3',5'-phosphorothioates

Area of Science:

• Medicinal Chemistry
• Organic Chemistry
• Nucleoside Chemistry

Background:

• Phosphorothioate analogs are crucial in nucleic acid chemistry, particularly for antisense oligonucleotides and other therapeutic applications.
• Controlling the stereochemistry at the phosphorus atom is essential for optimizing the biological activity and stability of these analogs.
• Morpholino nucleic acids offer unique properties, including nuclease resistance and altered binding characteristics.

Purpose of the Study:

• To develop a novel and efficient method for synthesizing P-stereodefined morpholino phosphorothioate analogs.
• To gain valuable structural insights into the stereochemistry of these synthesized compounds.
• To establish a reliable route for preparing P-stereodefined morpholino dinucleoside 3',5'-phosphorothioates.

Main Methods:

• Utilized a modified 1,3,2-oxathiaphospholane (OTP) method for the synthesis of morpholino phosphorothioate derivatives.
• Synthesized N-(2-Thio-4,4-pentamethylene-1,3,2-oxathiaphospholane) derivatives of morpholino-type nucleosides (mU-OTPs).
• Separated the synthesized compounds into pure P-diastereomers for stereochemical analysis and further modification.

Main Results:

• Successfully synthesized P-stereodefined morpholino phosphorothioate analogs for the first time.
• Obtained valuable structural insights into the stereochemistry of the synthesized compounds.
• Prepared P-stereodefined morpholino dinucleoside 3',5'-phosphorothioates using the separated P-diastereomers.

Conclusions:

• The modified OTP method is effective for the stereoselective synthesis of P-stereodefined morpholino phosphorothioate analogs.
• The study provides critical stereochemical information for the design and synthesis of novel morpholino-based nucleic acid analogs.
• These findings pave the way for developing new therapeutic agents with enhanced properties and specific stereochemical configurations.