Total Synthesis of Mollanol A

Area of Science:

• Natural Product Synthesis
• Medicinal Chemistry
• Organic Chemistry

Background:

• Mollanol A, a novel mollane-type grayanoid, features a unique C-nor-D-homograyanane skeleton and a 5,8-epoxide.
• Mollanol A exhibits transcriptional activation of Xbp1 promoters, suggesting therapeutic potential for inflammatory bowel disease.

Purpose of the Study:

• To report the first total synthesis of mollanol A.
• To establish a synthetic route for exploring the therapeutic applications of mollanol A.

Main Methods:

• A 15-step convergent synthesis strategy was employed.
• Key reactions included an InCl3-catalyzed Conia-ene cyclization to form the bicyclo[3.2.1]octane moiety.
• A vinylogous aldol reaction followed by intramolecular oxa-Michael addition rapidly assembled the oxa-bicyclo[3.2.1] core.

Main Results:

• Successful completion of the first total synthesis of mollanol A.
• The synthesis was achieved from commercially available starting materials.

Conclusions:

• The total synthesis of mollanol A provides access to this unique natural product.
• This synthetic achievement enables further investigation into its potential as a therapeutic agent for inflammatory bowel disease.