Add time:07/13/2019 Source:sciencedirect.com
N-(3-chloro-4fluoro-phenyl)-7-methoxy-6-(3-morpholin-4ylpropoxy)-quinazolin-4-amine (GEF), a quinalizoline derivative used as new anti-cancer agent, designed to target activity of epidermal growth factor receptor (EGFR) promoting the growth, division and spread of cancer cells, was examined from the vibrational and theoretical point of view. All calculations have been carried out both in gaseous and aqueous phases. In the calculations of both phases, the molecule has been optimized through conformer analysis beginning with the x-ray data. The conformer analyses have been carried out in each phases and the geometrical differences between the most stable structures in gaseous and in aqueous phases have been discussed. The solvent effect for GEF in aqueous solution was simulated by using self-consistent reaction field (SCRF) calculations employing the integral equation formalism variant (IEFPCM) model. NBO analysis has been performed to indicate the presence of intramolecular charge transfer. The complete assignments of the vibrational spectra (IR&Raman) were made with the aid of calculated spectra both in gaseous and aqueous phases. The observed spectral data of the title compound were compared with the calculated spectra obtained by DFT/B3LYP and DFT/B3PW91 methods using 6-31G(d,p) basis set. The theoretical results were found to be in good agreement with the measured experimental data especially for the interpretation of intra molecular interactions.
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