Regioselective synthesis of substituted pyrroles: Efficient palladium-catalyzed cyclization of internal alkynes and 2-amino-3-iodoacrylate derivatives

[GRAPHICS] The first efficient and regioselective palladium-catalyzed cyclization of internal alkynes and 2-amino-3-iodoacrylates to give moderate to excellent yields of highly functionalized pyrroles has been developed. This approach is applicable to a range of alkynes and affords the deacylated pyrrole under reaction conditions for most substrates.