A series of novel compounds as candidates for OLED applications were synthesized by
cyclization reactions of neighbouring rings in dipyrazolo[3,4-b:4',3'-e]pyridines 8-12. The
desymmetrization of these molecules leading to 14 can be performed using both
KOH/isoquinoline or palladium catalysts. The resulting structures contain a helical arrangement
of four different rings.