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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.

: In continuation of our efforts to find new antimicrobials, herein we report the synthesis of various pyrazole, pyrazoline, and pyridine based novel bioactive heterocycles (3a-t). Newly synthesized compounds analysed for their antimicrobial activity. Compounds 3c, 3h, 3i, 3k, 3n, and 3q were showed significant antimicrobial activity. Molecular docking study for the most active analogues DNA gyrase subunit b (PDB ID: 1KZN) corroborated well with observed antimicrobial potency exhibiting significant binding affinity. For the interpretation of the chemical structures reported in this paper were based on IR, 1H NMR, 13C NMR, and mass spectral data.