Fused Imidazo[1,2-d][1,2,4]Thiadiazolo[1,2,3]Triazoles: One-Pot Synthesis, Anti-Bacterial, Anti-Biofilm and TLR4 Inhibitory Activities

Abstract

We developed and evaluated several new fused imidazo[1,2-d][1,2,4]thiadiazolo[1,2,3]triazoles to see how they perform against bacteria and biofilms. Some compounds showed acceptable activity compared to the primary standard, Dicloxacillin. Some of the compounds demonstrated significant antibacterial activity against S. aureus, with MIC values ranging from 1.56–12.5 μg/mL. We also found anti-biofilm properties in the potent compounds. The results showed that derivatives 3-(4-fluorophenyl)imidazo[1,2-d] [1,2,3] triazolo[1,5-b][1,2,4]thiadiazole 8,8-dioxide and 3-(3,5-difluorophenyl)imidazo[1,2-d][1,2,3]triazolo[1,5-b][1,2,4] thiadiazole 8,8-dioxide were strong antibacterial agents and effective MSSA and MRSA biofilm growth inhibitors. We conducted in silico studies to assess the molecular interactions of more potent compounds with TLR4 proteins (PDB: 3FXI, 3VQ1, 3RG1). Our findings revealed that 3-(4-chloro-3,5-dimethoxyphenyl)imidazo[1,2-d][1,2,3]triazolo[1,5-b] [1,2,4]thiadiazole 8,8-dioxide, 3-(3,5-dichlorophenyl)imidazo[1,2-d] [1,2,3]triazolo[1,5-b][1,2,4] thiadiazole 8,8-dioxide, and 3-(4-(trifluoromethyl)phenyl)imidazo[1,2-d][1,2,3]triazolo[1,5-b][1,2,4] thiadiazole 8,8-dioxide exhibited more binding interactions than dicloxacillin. ADME of more potent compounds examined in this study and compounds could potentially inhibit the cytochrome P450 CYP2C19 isoform.