Porphyrins with exocyclic rings. Part 21: Influence of pyrrolic and carbocyclic ring alkyl substituents on the synthesis of porphyrins bearing six-membered exocyclic rings

Syntheses of porphyrins with substituted six-membered exocyclic rings from tetrahydroindoles have been developed. These sterically congested porphyrins were generated using the MacDonald '2+2' methodology or a one step self-condensation procedure.