Total synthesis of (+)-pleuromutilin

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Natural Product Synthesis

Background:

• Pleuromutilin is a natural product with significant antibacterial activity.
• Existing synthetic routes to pleuromutilin derivatives are often lengthy or lack stereochemical control.
• The development of an enantiospecific total synthesis is crucial for accessing novel analogs and understanding structure-activity relationships.

Purpose of the Study:

• To achieve the first enantiospecific total synthesis of the natural product (+)-pleuromutilin.
• To develop a novel synthetic strategy enabling efficient and stereoselective construction of the pleuromutilin core.
• To provide a scalable route for the synthesis of (+)-pleuromutilin and its derivatives for further biological evaluation.

Main Methods:

• Synthesis of a non-racemic cyclisation substrate derived from (+)-trans-dihydrocarvone.
• Implementation of a highly selective Samarium(II) iodide (SmI2)-mediated cyclisation cascade.
• Utilisation of an electron transfer reduction for a sterically hindered ester and efficient conversion of (+)-mutilin.

Main Results:

• Successful enantiospecific total synthesis of (+)-pleuromutilin.
• Demonstration of a highly selective SmI2-mediated cyclisation cascade for constructing the core structure.
• Efficient conversion of (+)-mutilin to the target molecule, showcasing the utility of the developed methodology.

Conclusions:

• The developed synthetic route represents a significant advancement in the total synthesis of pleuromutilin.
• This enantiospecific approach provides access to enantiomerically pure (+)-pleuromutilin, facilitating further medicinal chemistry efforts.
• The methodology is amenable to the synthesis of diverse pleuromutilin analogs with potential antibacterial applications.