Acyclic analogs of dideoxydidehydronucleosides

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Nucleoside Analogs

Background:

• Acyclic nucleoside analogs are crucial in medicinal chemistry.
• Structural modifications can lead to novel therapeutic properties.
• Dideoxydidehydronucleosides serve as a structural reference.

Purpose of the Study:

• To synthesize and characterize a new class of acyclic nucleoside analogs.
• To incorporate C5 hydroxyalkyl fragments into nucleoside structures.
• To evaluate the feasibility of computer modeling in guiding synthesis.

Main Methods:

• Condensation reactions between a functionalized pentene derivative and heterocyclic bases (pyrimidines, guanine, adenine).
• Use of persilylated heterocyclic bases and adenine sodium salt for efficient coupling.
• Deprotection of acetyl groups using ammonia in methanol.

Main Results:

• Successful synthesis of acyclic nucleosides (compounds 5a-d, 6a-d) with C5 hydroxyalkyl fragments.
• Yields for the condensation step ranged from 40% to 85%.
• Formation of the desired deprotected nucleosides (1a-d, 2a-d) after deprotection.

Conclusions:

• A new synthetic route to acyclic nucleoside analogs with specific structural features has been established.
• Computer modeling accurately predicted the spatial arrangement of the synthesized analogs.
• The developed method provides access to novel nucleoside analogs for further investigation.