Rh( iii )-Catalyzed C(sp 2 )–H functionalization/cyclization cascade of N -carboxamide indole and iodonium reagents for access to indoloquinazolinone derivatives

A rhodium-catalyzed synthesis of indoloquinazolinone from a readily available hypervalent iodonium reagent and N -carboxamide indole was developed. The protocol features broad functional group tolerance, mild conditions, and excellent yields. The target products were obtained simply by filtration, without tedious column chromatography. Notably, the noble metal catalyst system can be recycled effectively at least ten times. The strategy may be amenable to industrial production.