We report herein a palladium-catalyzed domino cyclization/carbonylation to access ester-functionalized azaindolines, applying formates as a convenient carbonyl source. All four azaindoline isomers were constructed, exhibiting good functional group compatibility. On this basis, modifying the starting tether on the aminopyridine led to furoazaindolines via an intramolecular reductive cyclization after
The synthesis of annulated 2-aminopyridines by intramolecular radical pyridylation of the appropriate substrates, obtained from pyridinium N-2′-pyridylaminide, can be performed using TTMSS and AIBN.