Visible Light‐Promoted Cascade Sulfonylation‐Cyclization‐Aromatization of Tertiary Enamides to Access Multi‐Substituted Pyridines and 1,2‐Dihydropyridines

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Functionalized pyridines and 1,2‐dihydropyridines are crucial organic entities in natural products, organic materials, drugs and catalysts. Despite progress, a facile and eco‐friendly synthesis remains desirable so far. In this context, we disclose a novel visible light‐promoted radical cascade sulfonylation‐cyclization‐aromatization of N‐propargyl enamides with selenosulfonates. This approach avoids the use of metal‐ or photocatalyst, bases and external oxidants, marking a significant advance in sustainable and green chemistry accords. Utilizing this protocol, we successfully synthesized a diverse range of sulfonated 1,2‐dihydropyridines and pyridines, featuring good functional group compatibility, simple operation and mild condition.