Tandem Pd-catalyzed annulation/coupling of acetylenic enamines with aryl triflates. 2023

Aleksandra Błocka, and Jakub Ostapko, and Wojciech Chaładaj
Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw 01-224, Poland. wojciech.chaladaj@icho.edu.pl.

A cascade of 5-exo-dig intramolecular nucleophilic addition of enamine to terminal alkyne followed by cross coupling has been demonstrated for the first time. Two new C-C bonds are stereoselectively forged by a single Pd-complex capable of catalyzing two mechanistically diverse transformations. Mechanistic investigations identified cyclization as the rate limiting step relying on the facile displacement of OTf, weakly bound to the Pd-center, by the alkyne.

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