Total Synthesis of (+)-Malbrancheamide B Employing a Bioinspired Strategy

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Prenylated indole alkaloids are complex fungal secondary metabolites.
• Their intricate structures and biological activities make them desirable synthetic targets.

Purpose of the Study:

• To achieve the first asymmetric total synthesis of (+)-malbrancheamide B.
• To develop efficient synthetic strategies for complex prenylated indole alkaloids.

Main Methods:

• Bioinspired diketopiperazine (DKP) assembly.
• Stereoselective oxidative radical cyclization.
• Intramolecular Friedel-Crafts cyclization.

Main Results:

• Successful asymmetric total synthesis of (+)-malbrancheamide B.
• Construction of the characteristic diazabicyclo[2.2.2]octane scaffold fused to a tetrahydrocarbazole unit.
• Formation of the hexacyclic skeleton of malbrancheamide B.

Conclusions:

• The reported synthesis provides a viable route to (+)-malbrancheamide B.
• The methodology can be applied to the synthesis of other complex prenylated indole alkaloids.
• This work advances the field of natural product synthesis.