Palladium-Catalyzed Oxidative Amination of α-Olefins with Indoles.

Herein we report the use of indoles, one of the most common nitrogen-containing heterocycles in FDA-approved drugs, as nucleophiles in the Pd-catalyzed aza-Wacker reaction. This N -functionalization of indoles is a Markovnikov selective olefin functionalization of simple alkenes using catalytic Pd(NPhth) 2 (PhCN) 2 and O 2 as the terminal oxidant in the presence of catalytic Bu 4 NBr. Various substituted indoles and alkenes are found to participate; 21 examples are presented with yields ranging from 41 to 97% isolated yield. Additionally, lactams and oxazolidinones are shown to participate under the reaction conditions. Mechanistic investigations suggest that the phthalimide ligand and Bu 4 NBr additive slow undesired side reactions: indole decomposition and olefin isomerization, respectively.