In this study, we examined five previously synthesized compounds and checked their binding affinity towards the SARS-CoV-2 main protease (M
pro
) by molecular docking study, and compared the data with three FDA approved drugs, i.e., Remdesivir, Ivermectine and Hydroxychlorochine. In addition, we have investigated the docking study against the main protease of SARS-CoV-2 (M
pro
) by using Autodock 4.2 software package. The results suggested that the investigated compounds have property to bind the active position of the protein as reported in approved drugs. Hence, further experimental studies are required. The formation of intermolecular interactions, negative values of scoring functions, free binding energy and the calculated binding constants confirmed that the studied compounds have significant affinity for the specified biotarget. These studied compounds were passed the drug-likeness criteria as suggested by calculating ADME data by SwissADME server. Moreover, the ADMET properties suggested that the investigated compounds to be orally active compounds in human. Furthermore, density functional computations (DFT) were executed by applying GAUSSIAN 09 suit program. In addition,
Quantitative Structure-Activity Relationship
(QSAR) was studied by applying HyperChem Professional 8.0.3 program.
The article presents the synthesis of 2-arylimino-4-methyl-2,3-dihydro-1,3-thiazoles via Hantzsch reaction of thioureas and 3-chloropentane-2,4-dione or ethyl 2-chloro-3-oxobutanoate. The structure of synthesized compounds was confirmed by LCMS, 1 H, and 13 C NMR spectra. Cardioprotective activity of synthesized thiazole derivatives were studied in vitro on the isolated rings of the thoracic aorta of laboratory rats. Based on pharmacological studies, the tested compounds possessed a moderate to high cardioprotective effect. A prospective 1-[2-(4-methoxyphenylimino)-4-methyl-3-(4-methylpiperazine-1-yl)-2,3-dihydro-1,3-thiazole-5-yl] ethan-1-one hydrochloride 4c was identified. The mentioned compound has delayed the development of constrictor responses of isolated rings of the thoracic rat aorta and exceeds the activity of L-carnitine by 18.2% and meldonium by 12.9%. The compound 4c may be proposed as a potential cardioprotective agent for in-depth pharmacological studies.
The alkylation of 6-methyl-2-thioxo-2,3-dihydro-1H-pyrimidine-4-one phenacyl bromides under different conditions was investigated. It was found that during the reaction in the medium of DMF/K2CO3 a mixture of 2-(2-aryl-2-oxoethyl)thio-6-methyl-pyrimidine-4(3H)-one and 3-hydroxy-3-aryl-7-methyl-2,3-dihydro-5H-thiazolo[3,2-a]pyrimidine-5-one was formed. The holding of the resulting mixture in the concentrated sulphuric acid leads to the formation of cyclization products - derivatives of 3-aryl-7-methyl-5H-thiazolo[3,2-a]pyrimidin-5-one with high yields. Individual S-alkylated derivatives – 2-(2-aryl-2-oxoethyl)thio-6-methyl-pyrimidine-4(3H)-one - were obtained by reacting in methanol in the presence of sodium methoxide. Pharmacological screening of synthesized compounds for anticonvulsant activity on the model of pentylenetetrazole seizures in rats was carried out and some regularity “structure-activity” was established.
A targeted search for potential drugs of neurotropic action involves the choice of a basic "pharmacophore", which is advisable to carry out on the basis of the achieved principle among the classes of chemical compounds where active pharmaceutical substances with high targeted activity have already been identified. Therefore, the pyrrolidine core, which is the basic fragment of nootropics of the racetam group, is promising for the rational design of biologically active compounds of nootropic action. Its combination with other heterocyclic fragments, in particular, the 1,2,4-triazole ring, allows for these "hybrid" molecules to expect a permanent change in the magnitude of the pharmacological effects. Creation of a virtual library of compounds, 3D-pharmacophore screening and molecular docking is a promising way to optimize a targeted search for substances with a given pharmacological activity. The aim. To optimize targeted search for new nootropic compounds. Materials and methods. The base generation for the virtual screening was carried out using the Marvin Sketch 20.5 software. For receptor-oriented flexible docking, the Autodock 4.2 software package was used. Results. New derivatives of 1-benzyl-4-pyrrolidin-2-one were selected as the object of the study. Based on the results of the 3D pharmacophore screening and molecular docking to nootropic targets of the virtual base compounds, scoring functions were calculated. A detailed analysis of the geometrical arrangement of "hit compounds" at the active sites of nootropic receptors (PDB ID: 5UOW, 5CXV, 6PV7) made it possible to formulate hypotheses regarding possible ways of interaction of "hybrid" compounds with biotargets. The activity of promising molecules with respect to the studied receptors can be realized by creating complexes between them, the stability of which is ensured mainly due to the energetically favourable geometric arrangement of ligands in the active center of these acceptors, the formation of hydrogen bonds between them, and intermolecular electrostatic and donor-acceptor interactions. Conclusions. Structural modification of the pyrrolidine ring by combining with 1,2,4-triazole scaffold containing substituents of various electronic nature has been proposed. Using 3D-pharmacophore screening, the virtual base of 1-benzyl-4-pyrrolidin-2-one derivatives was analyzed in order to search among them for new molecules of nootropic action. Docking studies have identified a promising group of derivatives of 1-benzyl-4 (4-R-5sulfanylidene-4,5 dihydro-1H-1,2,4-triazol-3-yl) pyrrolidin-2-one, which have affinity for nootropic biotargets and are promising for further synthetic and pharmacological studies
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