Enantiospecific Solvolytic Functionalization of Bromochlorides

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Enantioenriched bromonium ions are key intermediates in organic synthesis.
• Developing new methods for stereoselective synthesis of complex molecules is crucial.

Purpose of the Study:

• To develop a novel method for generating and utilizing enantioenriched bromonium surrogates.
• To access complex bromocyclic scaffolds and natural product motifs with high stereocontrol.

Main Methods:

• Utilizing mild solvolytic conditions to ionize enantioenriched bromochlorides.
• Employing a variety of nucleophiles (olefins, alkynes, heterocycles, epoxides) for cyclization and trapping reactions.
• Investigating the reaction mechanism through mechanistic studies.

Main Results:

• Stereospecific cyclization of bromochlorides to form complex bromocyclic scaffolds.
• Intermolecular trapping of bromonium surrogates by diverse nucleophiles.
• Successful application to the scalable synthesis of a polycyclic brominated natural product.
• Demonstration of configurational stability of enantioenriched bromonium chlorides.

Conclusions:

• Mild solvolytic conditions enable the use of enantioenriched bromochlorides as versatile bromonium surrogates.
• This strategy provides access to enantioenriched bromocyclic compounds and natural product fragments with high stereoselectivity.
• The developed methodology offers a scalable and efficient approach for complex molecule synthesis.