A metal- and additive-free strategy for the synthesis of oxindoles has been achieved through a chlorine radical-induced cascade chlorination/carbocyclization of N-aryl acrylamides. Trichloroisocyanuric acid (TCCA) is used as both radical initiator and chlorine source. A wide range of substrates can be applied in this process to directly afford chlorinated oxindoles via C–Cl and C–C bond formation.
Key words
trichloroisocyanuric acid -
N-aryl acrylamide - chlorination - cascade carbocyclization reaction - oxindoles