No abstract

A convenient synthesis of pyrimidinthiones was carried out in presence of thiourea and easily available catalyst sulfamic acid (2a-t). One-pot Biginelli reaction is very important due to the use of simple and readily available chemicals, less reaction time, economically friendly, and furnishing good yield.Structures of the synthesized compounds are characterized by spectral techniques like IR, 1 H-NMR, 13 C-NMR, and LC-MS. Synthesized compounds were studied for their antimicrobial activity against several strains of bacteria (E. coli, P. aeruginosa, and S. aureus, S. pyogenes) and fungi (C. albicans, A. niger, and A. clavatus) using serial dilution method.

Compounds1-((1-(4-(2H-benzo[e] [1,3]oxazin-3(4H)-yl)phenyl) ethylidene)amino)-6-((arylidene)amino)-4-(4-chlorophenyl)-2oxo-1,2-dihydropyridine-3,5-dicarbonitriles (4a-j) were prepared, characterized and screened for antimicrobial activity. 3D-quantitative structure activity relationship (3D-QSAR) was explained by CoMFA and CoMSIA models to rationalize the antimicrobial activity of the titled compounds. Statistically significant 3D-QSAR (CoMFA and CoMSIA) models were created which could provide valuable information about the structural modification desired to improvise the biological activity. Additionally, the predictions based on the molecular docking study, against microbial DNA gyrase, were carried out.[a] Prof.

No abstract

No abstract

No abstract

Antibacterial assayMueller Hinton Broth dilution method (Becton Dickinson, USA) was used for the antibacterial assay of synthesized compounds. The strains used for antimicrobial activity of newly synthesized compounds were procured from the IMTECH, Chandigarh. The compounds (2a-t) were screened for their antibacterial activity in triplicate sets against these bacteria at different concentrations of 1000, 500, 250, and 200 μg/mL. The drugs which were found to be active in primary analysis were further diluted and evaluated. 10 μg/mL suspensions were further inoculated on appropriate media and the growth was noted after one or two days. Minimum inhibitory concentration is the lowest concentration, which showed no growth of microbes after spot subculture for each drug. The test mixture should contain 10 8 cells/mL. In this study, Ciprofloxacin was the standard drug for evaluating the antibacterial activity. Antifungal assayMueller Hinton Broth dilution method (Becton Dickinson, USA) was used for the antifungal assay of synthesized compounds. The strains used for antimicrobial activity of newly synthesized compounds were procured from the IMTECH, Chandigarh. The newly prepared compounds (2a-t) were screened for their antifungal activity as primary screens in six sets against C. albicans, A. niger, and A. clavatus at various concentrations of 1000, 500, and 250 μg/mL. The primary active compounds were similarly diluted to obtain 200, 125, 100, 62.5, 50, 25, and 12.5 μg/mL concentrations for secondary screening to test in a second set of dilutions against all fungi. The fungal activity of each compound was compared with Nystatin as a standard drug, which showed 100, 100, and 100 μg/mL MIC against C. albicans, A. niger and A. clavatus, respectively. Molecular dockingThe crystal structures of the crucial microbial target DNA gyrase subunit b was retrieved from the Protein Data Bank (RCSB) 1 (PDB ID:1KZN) and refined using the Protein Preparation Wizard.

No abstract