Photopromoted Entry to Benzothiophenes, Benzoselenophenes, 3H‐Indoles, Isocoumarins, Benzosultams, and (Thio)flavones by Gold‐Catalyzed Arylative Heterocyclization of Alkynes

Abstract Visible light‐promoted and gold‐photoredox‐catalyzed reactions of heteroatom (N, S, Se, O) tethered alkynes with arenediazonium salts selectively proceeded to build vicinal diaryl‐substituted 2 H ‐benzo[ e ][1,2]thiazine 1,1‐dioxides (benzosultams), benzoselenophenes, benzothiophenes, 4 H ‐chromen‐4‐ones (flavones), 3 H ‐indoles, 1 H ‐isochromen‐1‐ones (isocoumarins), and 4 H ‐thiochromen‐4‐ones (thioflavones). Moreover, the utility of functionalized 3 H ‐indoles as precursors for further elaboration has been demonstrated with the switchable and facile preparation of 1 H ‐indoles, 2‐oxindoles, and 3‐oxindolines. magnified image