Synthesis of reaction-ready 6,6 '-biindole and 6,6 '-biisatin via palladium(II)-catalysed intramolecular C-H functionalisation

The first synthesis of a 6,6'-biindole and 6,6'-biisatin scaffold is reported with the penultimate step being the formation of the di-heterocyclic ring by Pd(II)-catalysed intramolecular C-H functionalisation and Sandmeyer cyclisation, respectively.