Base-Assisted Intramolecular C–N Coupling Reaction from NH 2 -Bound Cyclopalladated L -Phenylalanine to Indoline-2-carboxylic Acid

International audienceThe deprotonative intramolecular-amination reaction of phenylalanine-derived palladacycles has been investigated to highlight a facile carbonate-assisted N–H activation before the C–N bond formation. A major counterion effect led to divergent pathways whereby the SPhos-Pd complexes with iodine, triflate, or trifluoroacetate anions were key intermediates to afford access to (S)-2-indolinecarboxylic acid derivatives