Copper-Mediated and Palladium-Catalyzed Cross-Coupling of Indoles and <i>N</i>-Methylpyridinium Salts: A Practical Way to Prepare 3-(Pyridin-2-yl)indoles
the corresponding 3-(pyridin-2-yl)indoles in moderate to good yields, wherein related electron-rich heterocycles (e.g., indole, 1-methylpyrrole, benzofuran, benzo[b]thiophene) are also applicable. Streamlined operation, good functional group tolerance, and late-stage modifications make this twofold C–H activation protocol an attractive route for the synthesis of 3-(pyridin-2-yl)indole derivatives.