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. Synthesis, Characterization and Photophysical Properties of Some New Thieno[2,3-b]pyridines bearing phenylethenyl moiety

Research Authors
Ahmed F. M. EL-Mahdy, Etify A. Bakhite, Shams H. Abdel-Hafez, Omaima F. Ibrahim, Hajjaj H. M. Abdu-Allah, Islam S. Marae
Research Date
Research Journal
Journal of Heterocyclic Chemistry
Research Publisher
Wiley
Research Website
https://onlinelibrary.wiley.com/doi/full/10.1002/jhet.4391
Research Year
2021
Research Abstract

5-Acetyl-3-cyano-6-methyl-4-(2-phenylethenyl)pyridine-2(1H)-thione (2) was synthesized by interaction of cinnamylidene-2-cyanothioacetamide 1 and acetylacetone or via one-pot reaction of E-cinnamaldehyde, 2-cyanothioacetamide, and acetylacetone. Reaction of 2 with ethyl iodide (3a) or N-chloroacetyl derivative of aromatic amines 3b–e in boiling ethanol containing sodium ethoxide gave the corresponding thioether 4a and 5-acetyl-3-amino-2-(N-arylcarbamoyl)-6-methyl-4-(2-phenylethenyl)thieno[2,3-b]pyridines 5b–e, respectively. Compound 5e was reacted with 2,5-dimethoxytetrahydrofuran or triethyl orthoformate to furnish pyrrolylthienopyyridine 6 or pyrdiothienopyrimidinone 7, respectively. The photophysical properties of 5b5c5e, and 7 were fully studied and the obtained results included herein. The fluorescence data confirmed that compounds 5b5c5e, and 7 exhibit aggregation-induced emission behavior with high absolute quantum yields.