Intramolecular Direct Arylation and Heck Reactions in the Formation of Medium‐Sized Rings: Selective Synthesis of Fused Indolizine, Pyrroloazepine and Pyrroloazocine Systems

The intramolecular palladium‐catalyzed reaction of N ‐(iodoarylalkyl)pyrroles can be applied for the selective synthesis of medium‐sized rings by choosing the appropriate catalytic systems to direct the reaction to the alkene or to the pyrrole nucleus. These reactions can also be extended to the corresponding heteroaryl halides. Thus, reaction conditions have been established to access selectively to (hetero)fused indolizine, pyrroloazepine and pyrroloazocine systems. magnified image