3'-Hydroxyesorubicin. Synthesis and antitumor activity

Area of Science:

• Medicinal Chemistry
• Organic Synthesis
• Pharmacology

Background:

• Anthracyclines are crucial anticancer agents.
• Development of novel analogues with improved efficacy and reduced toxicity is ongoing.
• Novel synthetic routes are essential for accessing new anthracycline derivatives.

Purpose of the Study:

• To develop a novel synthetic route to 4 -deoxy anthracycline analogues.
• To synthesize and evaluate new analogues, specifically 3 -deamino-4 -deoxy-3 -hydroxydaunorubicin and 3 -deamino-3 -hydroxyesorubicin.
• To compare the in vitro and in vivo anticancer activity of these novel analogues with existing drugs.

Main Methods:

• Synthesis of optically active 4,6-dideoxy-hex-1-enitol.
• Glycosylation of daunomycinone and 14-O-tert-butyldimethylsilyladriamycinone using Koenigs-Knorr conditions.
• Deblocking of alpha anomers to yield final analogues.
• In vitro cytotoxicity assays against P388, L1210 leukemia, and M5076 cells.
• In vivo antitumor activity evaluation in P388 leukemia models.

Main Results:

• A novel route to 4 -deoxy anthracycline analogues was successfully established.
• The synthesis yielded 3 -deamino-4 -deoxy-3 -hydroxydaunorubicin and 3 -deamino-3 -hydroxyesorubicin.
• 3 -hydroxyesorubicin exhibited comparable in vitro cytotoxicity to doxorubicin.
• 3 -hydroxyesorubicin demonstrated superior in vivo antitumor activity compared to doxorubicin.

Conclusions:

• The developed synthetic route provides access to novel 4 -deoxy anthracycline analogues.
• 3 -hydroxyesorubicin is a promising candidate for further anticancer drug development.
• This analogue shows potential for enhanced therapeutic efficacy in leukemia treatment.