Acyclic nucleoside phosphonates containing the amide bond: hydroxy derivatives.

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Virology

Background:

• Acyclic nucleoside phosphonates (ANPs) like adefovir and cidofovir are important antiviral agents.
• Modifying the phosphonate linker can alter drug properties and biological activity.
• Understanding linker rigidity is crucial for designing new ANP analogs.

Purpose of the Study:

• To synthesize and characterize novel nucleotide analogs with modified phosphorus-nucleobase linkers.
• To investigate the influence of linker rigidity and donor-acceptor properties on biological activity.
• To evaluate the antiviral and cytostatic potential of the synthesized compounds.

Main Methods:

• Synthesis of three series of nucleotide analogs using EDC coupling.
• Characterization of new phosphorus-nucleobase linkers via 1H and 13C NMR spectroscopy.
• Antiviral assays against a range of DNA and RNA viruses.
• Cytostatic activity assessment against leukemia and myeloma cell lines.

Main Results:

• Successful synthesis of nucleotide analogs with P-X-HN-C(O)- linkers, replacing the P-CH2-O-CHR- fragment.
• NMR data indicated restricted rotation within amide bonds and specific four-atom units.
• Synthesized analogs were inactive against a wide spectrum of viruses up to 100 μM.
• Two phosphonate analogs demonstrated cytostatic activity against K-562 and MM.1S cells (IC50: 28.8 and 40.7 μM).

Conclusions:

• The novel nucleotide analogs with modified linkers did not exhibit antiviral properties.
• The synthesized compounds possess cytostatic activity, suggesting potential in cancer therapy.
• Linker modifications influence biological activity, warranting further investigation for anticancer drug development.