Pyrazolo[4,3-a]quinindoline as a new highly fluorescent heterocyclic system: Design, synthesis, spectroscopic characterization and DFT calculations

Transition‐Metal‐Free Direct Synthesis of Tetra‐ and Pentacyclic Azaheteroarenes via [3+3] Annulation of Nitroarenes and Benzyl‐Type Carbanions Mediated by Silylating Agents.

“…As shown above, the indole derivatives 10–12 reacted satisfactorily with 6‐nitroquinoline to form respectively compounds 22–24 . Recently high fluorescent activity of pyrazolo[4,5‐ a ]indolo[2,3‐ b ]quinolines was reported, thus we applied our methodology to reaction of protected indolylacetonitrile 11 with n‐butyl‐5‐nitroindazole ( 27 ) and obtained compound 34 in 64 % yield.…”

Synthesis, electrochemical, photophysical, and photovoltaic properties of new fluorescent compounds: 3 H ‐benzofuro[2,3‐ b ]pyrazolo[4,3‐ f ]quinoline

“…In our earlier research works, some new fluorescent heterocyclic compounds have been synthesized with pentacyclic aromatic skeleton featuring indole, 4‐pyridinecarbonitrile, and benzimidazole or indazole systems as the key ingredients 33,34 . In the present study, which is conducted as continuation of our investigations on synthesizing new heterocyclic dyes as organic photosensitizers in DSSCs, 35,36 we have aimed at a synthesis of 3 H ‐benzofuro[2,3‐ b ]pyrazolo[4,3‐ f ]quinolines as novel fluorophores as high‐performance organic photosensitizers.…”