Photosensitizer-Free Synthesis of Arylsulfonated 4,5-Fused Polycyclic Coumarin Derivatives via Photoinduced Cascade Sulfonylation/Cyclization of 4-(N-Alkyl-N-acrylamido)coumarins.
A practical visible-light-induced cascade sulfonylation/cyclization of 4-(N-alkyl-N-acrylamido)coumarins bearing unactivated alkenes with arylsulfonyl chlorides has been developed for the synthesis of arylsulfonylated 4,5-fused polycyclic coumarin derivatives. The reaction proceeds at room temperature under external ph...