Synthesis and characterization of novel hybrid compounds containing coumarin and benzodiazepine rings based on dye

Abstract

Coumarin derivatives, one of the organic fluorescent materials, are widely applied in many areas such as laser dyes, organic light emitting diodes (OLED), pharmaceuticals and bio/chemosensors, with the advantages of the large conjugated system and planar structure. In the coumarin analogs, which are polarity sensitive fluorophores, a shift to the red zone is observed in the case of π expansion at 3-positions and electron donor groups at 7-positions. The present article reports the synthesis of novel hybrid compounds (CD1-CD8) containing coumarin and benzodiazepine rings using ethyl 3-(7-(diethylamino)-2-oxo-2H-chromen-3-yl)-3-oxopropanoate reagent and 1,2-diaminobenzene derivatives under optimized reaction conditions with PTSA catalyst. The structures of target compounds synthesized were characterized by FTIR, 1 HNMR, 13 CNMR, HRMS and UV-Vis spectra. The effects of electron withdrawing and electron donor groups in the cyclocondensation reaction that takes place as regioselective were evaluated in detail. The substituent effects were investigated for n-π* and π-π* electronic transitions in UV-Vis Spectroscopy.

NiFe2O4@SiO2@PrNH2–DPA–CeCl3: a cerium-based magnetic nano dual-acid catalyst with high efficacy and recyclability for domino sequential synthesis of lactam ring-fused 1,5-benzodiazepines

“…This step is generally realized in the presence of a catalyst. A large number of synthetic methodologies for 1,5-benzodiazepines in the existence of distinct single-acid catalysts, such as trifluoroacetic acid, 29,30 p-toluenesulfonic acid, [31][32][33] polyphosphoric acid, 34 heteropoly acids, 35,36 Ce(OTf) 3 (ref. 37) and Cu(OAc) 2 (ref.…”