Total synthesis of jerangolid A

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Jerangolid A is a polyketide with antifungal properties.
• The total synthesis of complex natural products is crucial for drug discovery and development.
• Efficient synthetic strategies are needed to access biologically active molecules.

Purpose of the Study:

• To achieve the first total synthesis of the antifungal polyketide jerangolid A.
• To develop a robust and efficient synthetic route amenable to analogue synthesis.
• To explore novel synthetic methodologies in the construction of complex polyketides.

Main Methods:

• The synthesis commenced with readily available chiral building blocks: (R)-Roche ester and (S)-glycidol.
• Key steps included a syn-selective Lewis acid-catalyzed 6-endo-trig cyclization for dihydropyran formation.
• The lactone segment was constructed via tandem conjugate addition-lactonization, followed by functionalization and olefination reactions (e.g., Julia-Kocienski).

Main Results:

• Successful completion of the first total synthesis of jerangolid A.
• Demonstration of a highly syn-selective Lewis acid-catalyzed 6-endo-trig cyclization for constructing the dihydropyran core.
• Efficient construction of the lactone segment using a tandem conjugate addition-lactonization sequence.

Conclusions:

• The developed synthetic strategy provides a viable route to jerangolid A and related compounds.
• The study highlights the utility of specific synthetic transformations in complex molecule assembly.
• This synthesis lays the groundwork for further biological evaluation and structure-activity relationship studies of jerangolid A analogues.