Palladium-Catalyzed Intramolecular Addition of C-N Bond to Alkynes: A Novel Approach to 3-Diketoindoles.

Palladium-catalyzed intramolecular addition of C–N bond to alkynes to synthesize 3-diketoindoles via the construction of indole ring with the migration of the α-ketoacyl group has been achieved. This protocol features operational simplicity, high atom economy, broad substrate scope and high yields, thus affording a versatile approach to highly functional 3-diketoindoles.