meta-Sulfonylation of Pyridines from Sulfur Dioxide with Dearomatized Pyridines as Redox-Active Substrates.

Key Points

• This research explores a new method for sulfonylating pyridines using sulfur dioxide and dearomatization strategies.
• Applied a dearomatization and rearomatization strategy using thianthrenium salts
• Examined oxazino-pyridine substrates as redox-active elements
• Conducted mechanistic studies on the reaction processes
• Demonstrated effective transformation of pyridines using the proposed method
• Identified redox-active behavior of oxazino-pyridine substrates with photocatalyst
• Revealed the role of thianthrenium salts as radical precursors in the mechanism