Palladium‐Catalyzed Carbonylative Transformation for the Synthesis of Tetracyclic Indoline Thioesters

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Palladium‐catalyzed thioesterification of (aza)indole‐tethered aryl iodides, Mo(CO) 6 , and sulfonyl chlorides is reported. A series of C2 thioester‐group substituted indoline‐fused ring compounds are constructed by an intramolecular Heck cyclization and carbonylation chemistry involving N ‐(2‐iodobenzoyl)indole. The salient features of this three‐component cascade sequence include the use of solid Mo(CO) 6 as the carbon monoxide source and good functional group tolerance.