Dithionite-Involved Multicomponent Coupling for Alkenyl and Alkyl Tertiary Sulfones

Area of Science:

• Organic Chemistry
• Synthetic Chemistry

Background:

• Tertiary sulfones are valuable synthetic intermediates.
• Efficient methods for constructing sulfones are in demand.

Purpose of the Study:

• To develop a novel multicomponent reaction for synthesizing alkyl and alkenyl tertiary sulfones.
• To utilize sodium dithionite as a cost-effective reagent in organic synthesis.

Main Methods:

• A multicomponent reaction involving redox-active esters, alkenes/alkynes, and sodium dithionite.
• Sodium dithionite acts as both a sulfur dioxide surrogate and a single-electron reductant.
• Mechanistic studies including proton trapping were performed.

Main Results:

• Successfully constructed a range of alkyl and alkenyl tertiary sulfones.
• Demonstrated the utility of sodium dithionite in initiating decarboxylation of redox-active esters.
• Identified a proton trapping mechanism distinct from traditional radical trapping pathways.

Conclusions:

• A new, efficient method for tertiary sulfone synthesis has been established.
• Sodium dithionite offers a sustainable and economical approach for sulfur dioxide incorporation.
• The elucidated mechanism provides new insights into radical-mediated transformations.