Synthesis of Sulfur- and Oxygen-Bridged Cationic 4-Helicenes Mediated by Friedel–Crafts-S N Ar Tandem Reactions for Red-light-driven Organophotoredox Catalysis

Key Points

• This research aims to develop a method for synthesizing sulfur- and oxygen-bridged cationic [4]-helicenes.
• Conducted a tandem Friedel–Crafts–SNAr reaction
• Utilized diaryl sulfides and diaryl ethers as starting materials
• Incorporated (thio)salicylic acid in the synthesis
• Successfully synthesized sulfur- and oxygen-bridged cationic [4]-helicenes
• Demonstrated the effectiveness of light-driven organophotoredox catalysis