Total Synthesis of (-)-Oxycodone via Anodic Aryl-Aryl Coupling

Area of Science:

• Organic Chemistry
• Electrochemistry
• Medicinal Chemistry

Background:

• The synthesis of complex opioid analgesics like oxycodone often involves multiple steps.
• Developing efficient and selective synthetic routes is crucial for pharmaceutical production.

Purpose of the Study:

• To develop a novel electrochemical method for synthesizing (-)-oxycodone.
• To achieve regio- and diastereoselective synthesis of key intermediates.

Main Methods:

• Electrochemical 4a-2'-coupling of a 3',4',5'-trioxygenated laudanosine derivative.
• Conjugate nucleophilic substitution for E-ring closure.
• [4 + 2] cycloaddition with singlet oxygen for C-14 hydroxylation.

Main Results:

• The electrochemical coupling successfully produced the morphinandienone intermediate with high regio- and diastereoselectivity.
• The overall synthesis yielded (-)-oxycodone efficiently.
• The anodic transformation demonstrated high yields under constant current conditions.

Conclusions:

• Electrochemical synthesis provides a viable and efficient route to (-)-oxycodone.
• The described method is adaptable for both batch and continuous flow processes.
• This approach enhances the synthesis of complex pharmaceutical compounds.