Total Synthesis of (+)-MPC1001B

Area of Science:

• Organic Chemistry
• Natural Product Synthesis
• Medicinal Chemistry

Background:

• Epidithiodiketopiperazine alkaloids are a class of natural products with potential biological activities.
• The total synthesis of complex alkaloids provides access to these compounds for further study.
• Previous synthetic routes to similar structures have limitations.

Purpose of the Study:

• To achieve the first total synthesis of the epidithiodiketopiperazine alkaloid (+)-MPC1001B.
• To develop novel synthetic methodologies for constructing complex alkaloid scaffolds.
• To provide a scalable route for accessing (+)-MPC1001B.

Main Methods:

• A tetra-n-butylammonium fluoride mediated intramolecular aldol reaction was employed to construct the 15-membered macrolactone ring.
• A stepwise sulfenylation reaction, utilizing a novel trityl trisulfide (TrSSS)-group transfer, was developed to build the epidithiodiketopiperazine substructure.
• The synthesis involved strategic protection and deprotection steps to ensure regioselectivity and stereocontrol.

Main Results:

• The complete synthetic route to (+)-MPC1001B was successfully established.
• The novel trityl trisulfide reagent proved effective for efficient epidithiodiketopiperazine formation.
• The intramolecular aldol reaction provided a key C-C bond formation for the macrolactone.

Conclusions:

• The first total synthesis of (+)-MPC1001B demonstrates the feasibility of constructing this complex alkaloid.
• The developed synthetic methods offer new tools for the synthesis of related epidithiodiketopiperazine natural products.
• This work paves the way for further biological evaluation of (+)-MPC1001B and its analogs.