Studies on the chemical reactivity of 1H-benzimidazol-2-ylacetonitrile towards some 3-substituted chromones: synthesis of some novel pyrido[1,2-a]benzimidazoles

Synthesis, structural, spectral, optical characterizations of (3-cyano-9-methyl-5-oxo-1, 5-dihydro-2H-chromeno [4,3-b] pyridin-2-ylidene) propanedinitrile (CMOCPP) and its photodiode application

“…Infrared spectra were measured on FTIR Nicolet IS10 spectrophotometer (cm À1 ), PerkinElmer 293 spectrophotometer (cm À1 ), using KBr disks. 1 H NMR (300 MHz) and 13 C NMR (75 MHz) spectra were measured on Mercury-300BB, using DMSO-d 6 as a solvent and TMS (d) as the internal standard. Mass spectra were obtained using GC-2010 Shimadzu Gas chromatography instrument mass spectrometer (70 eV).…”

“…Chromone-3-carbonitriles have attracted considerable attention as highly reactive compounds, due to the presence of three electrophilic centers (C-2, C-4 and CN group) [9,10]. These compounds possess a highly polarized C2-C3 p-bond and their reactions with binucleophiles start predominantly through the nucleophilic attack at the unsubstituted C-2 atom accompanied by g-pyrone ring opening to form the b-dicarbonyl intermediates which capable of undergoing intramolecular heterocyclizations [11][12][13]. The important finding of the work is that the optical and electrical characteristics show promising candidates suitable for photosensing applications.…”

Chemistry of 2-amino-4-oxo-4H-1-benzopyran-3-carboxaldehydes

“…Condensation of 1 with benzimidazol-2-ylacetonitrile 139 in boiling EtOH-NEt 3 affords the azaxanthone 140 in 65% yield. 61 Under similar conditions the nitrile 139 with 3-cyanochromone 7 and its 6-methyl homologue produce the chromeno [3,2- …”

Synthesis, optical and photoelectrical characterizations of the novel 10-chloro-6H,8H-dichromeno[2,3-b:3′,4′-e]pyridine-6,8-dione (CDPD) and its photodiode application

“…Among these materials, chromeno [2,3-b]pyridines is one of the most promising organic structure for possible applications because they exhibit various biological activities including pharmacological [1], antiplatelet [2], antiallergic [3], antiangiogenic [4], antirheumatic [5], antibacterial [6], anti-inflammatory and analgesic [7]. Friedländer condensation of 2-aminochromone-3-carboxaldehyde is a well-known reaction for preparation of chromeno [2,3-b]pyridine derivatives [8][9][10]. Due to their electronic and photoelectronic characteristics, these structures have been utilized extensively in many electronic and photoelectronic devices [11,12].…”