Total Synthesis of (+)-Haperforin G

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Medicinal Chemistry

Background:

• Haperforin G is a complex natural product with potential biological activity.
• Efficient synthetic routes are crucial for accessing natural products and their analogs for further study.
• Stereoselective synthesis of complex molecules presents significant challenges in organic chemistry.

Purpose of the Study:

• To develop a novel and efficient synthetic strategy for (+)-Haperforin G.
• To establish methodologies for constructing key structural motifs, including quaternary stereocenters.
• To enable the synthesis of structurally diverse analogs of Haperforin G for biological evaluation.

Main Methods:

• A 20-step synthesis starting from commercially available materials.
• Cobalt-catalyzed intramolecular Pauson-Khand reaction for stereoselective cyclopentanone construction.
• Light-initiated photocatalysis for asymmetric cross-coupling of unstabilized C(sp3) radicals with enones.

Main Results:

• Successful synthesis of (+)-Haperforin G in 20 steps.
• Stereoselective formation of an all-carbon quaternary stereogenic center at the bridge-head position.
• Development of a convergent and asymmetric cross-coupling reaction involving a C(sp3) radical.

Conclusions:

• The developed synthetic route is efficient and versatile.
• The employed methodologies provide access to structurally diverse analogs of Haperforin G.
• This work advances the synthesis of complex natural products and related compounds.