Potent and Selective Oxidatively Labile Ether-Based Prodrugs through Late-Stage Boronate Incorporation

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Drug Delivery

Background:

• Prodrugs enhance drug efficacy and reduce toxicity.
• Acyl-linked prodrugs exhibit limited hydrolytic stability.
• Novel prodrug strategies are needed for improved cancer therapeutics.

Purpose of the Study:

• To introduce a new prodrug synthesis strategy utilizing boryl allyloxy (BAO) ether groups.
• To develop prodrugs with enhanced hydrolytic stability and selective activation.
• To demonstrate the efficacy of BAO-based prodrugs against cancer cell lines.

Main Methods:

• Synthesis of boryl allyloxy (BAO) ether groups via metal-mediated processes.
• Late-stage functionalization for prodrug activation.
• Preparation of camptothecin and pederin prodrug analogues.
• In vitro cytotoxicity assays on cancer and non-cancerous cell lines.

Main Results:

• BAO ether groups are stable and selectively cleaved under oxidative conditions.
• Prodrug analogues of camptothecin and pederin were successfully synthesized.
• Pederin-based prodrug demonstrated significant cytotoxicity and selectivity towards cancer cells.
• BAO acetals release cytotoxic agents upon exposure to hydrogen peroxide.

Conclusions:

• The BAO ether strategy offers a stable and chemoselective approach to prodrug synthesis.
• This method enables late-stage functionalization, applicable to various drug systems.
• BAO-based prodrugs show promise for targeted cancer therapy with improved safety profiles.