# Synthesis and Properties of 1H-Pyrrolo[3′,2′:3,4]fluoreno[9,1-gh]quinolines and 7H-Pyrrolo[2′,3′,4′:4,10]anthra[1,9-fg]quinolines

## TL;DR

This paper describes the synthesis and study of new N-doped polycyclic compounds with unique optical and aromatic properties.

## Contribution

A novel class of N-doped polycyclic heteroaromatic compounds was synthesized using site-selective cross-coupling and cycloisomerization.

## Key findings

- The compounds were synthesized using a site-selective cross-coupling reaction and acid-mediated cycloisomerization.
- Optical and aromatic properties were analyzed using absorption, fluorescence spectroscopy, and DFT calculations.
- The position of N-doping and ring alternation significantly influenced the compounds' properties.

## Abstract

We report the synthesis of pyrrolo[3′,2′:3,4]fluoreno[9,1-gh]quinoline and pyrrolo[2′,3′,4′:4,10]anthra[1,9-fg]quinoline derivatives. This novel class of N-doped polycyclic heteroaromatic compounds was synthesized by a site-selective cross-coupling reaction followed by acid-mediated cycloisomerization and Pd-catalyzed CH arylation as the final ring-closing reactions. Preliminary optical and aromatic properties were studied by means of steady-state absorption and fluorescence spectroscopy and DFT calculation. Special emphasis was placed on the impact of ring alternation and position of the N-doping within the scaffold.