Mechanistic Insight into the Regioselective Palladation of Indole Derivatives: Tetranuclear Indolyl Palladacycles with High C2–Pd or C3–Pd Bond Selectivity

This research provides a straightforward understanding
of the regioselective
palladation of indole derivatives by capturing both C2–Pd and
C3–Pd intermediates of N-phenylindole and N-methylindole. Those tetranuclear indolyl palladacycles
suggest that the regioselectivity of palladation depends on the N-substituted
protective groups of indoles as well as the acidity of the reaction
medium.