Synthesis of Free NH 2‐(Aminomethyl)indoles Through Copper‐Catalyzed Reaction of 3‐(ortho‐Trifluoroacetamidophenyl)‐1‐propargylic Alcohols with Amines and Palladium/Copper‐Cocatalyzed Domino Three‐Component Sonogashira Cross‐Coupling/Cyclization/Substitution Reactions.