Synthesis and biological evaluation of heterocyclic 1,2,4-Triazole scaffolds as promising pharmacological agents

Background: Triazole is an important heterocyclic moiety that occupies a unique position in heterocyclic chemistry, due to its large number of biological activities. It exists in two isomeric forms i.e. 1,2,4-triazole and 1,2,3-triazole and is used as core molecule for the design and synthesis of many medicinal compounds. 1,2,4-Triazole possess broad spectrum of therapeutically interesting drug candidates such as analgesic, antiseptic, antimicrobial, antioxidant, anti- urease , anti-inflammatory, diuretics, anticancer, anticonvulsant, antidiabetic and antimigraine agents. Methods: : The structures of all synthesized compounds were characterized by physicochemical properties and spectral means (IR and NMR). The synthesized compounds were evaluated for their in vitro antimicrobial activity against Gram-positive ( B. subtilis ), Gram-negative ( P. aeruginosa and E. coli ) bacterial and fungal ( C. albicans and A. niger ) strains by tube dilution method using ciprofloxacin, amoxicillin and fluconazole as standards. In-vitro antioxidant and anti- urease screening was done by DPPH assay and indophenol method, respectively. The in-vitro anticancer evaluation was carried out against MCF-7 and HCT116 cancer cell lines using 5-FU and cisplatin as standards. Results: , discussion and conclusion: The biological screening results reveal that the compounds T 5 (MIC BS,EC = 24.7µM, MIC PA, CA = 12.3 µM) and T 17 (MIC AN = 27.1µM) exhibited potent antimicrobial activity as comparable to standards ciprofloxacin, amoxicillin (MIC Cipro = 18.1µM, MIC Amo = 17.1µM) and fluconazole (MIC Flu = 20.4µM), respectively. The antioxidant evaluation showed that compounds T 2 (IC 50 = 34.83 µg/ml) and T 3 (IC 50 = 34.38 µg/ml) showed significant antioxidant activity and comparable to ascorbic acid (IC 50 = 35.44 µg/ml). Compounds T 3 (IC 50 = 54.01µg/ml) was the most potent urease inhibitor amongst the synthesized compounds and compared to standard thiourea (IC 50 = 54.25 µg/ml).The most potent anticancer activity was shown by compounds T 2 (IC 50 = 3.84μM) and T 7 (IC 50 = 3.25μM) against HCT116 cell lines as compared to standard 5-FU (IC 50 = 25.36μM).