Lei Jiao, Eberhardt Herdtweck, and Thorsten Bach Journal of the American Chemical Society Article ASAP
This thorough paper outlines a method for functionalizing indoles using catalytic amounts of palladium in the presence of excess norbornene. They probe the mechanism of this transformation using NMR spectroscopy, isotope labeling and trapping experiments. They identify and isolate an interesting palladacyclic intermediate shown in the above figure. They then apply this chemistry to the total synthesis of Aspidospermidine and Goniomitine, two indole alkaloids.