Pd-catalyzed Regioselective Intramolecular Direct Arylation of 3-indolecarboxamides: Access to Spiro-indoline-3,3'-oxindoles and 5,11-dihydro-6H-indolo[3,2-c]quinolin-6-ones

We report regioselective intramolecular direct C-3 and C-2 arylations of the indole rings of N-(o-bromophenyl)-3-indolecarboxamides for diastereospecific production of spiro-indoline-3,3'-oxindoles and 5,11-dihydro-6H-indolo[3,2-c]quinolin-6-ones, respectively, under different reaction conditions and possibly involving two different pathways.