Novel pyrazole fused heterocyclic ligands: Synthesis, characterization, DNA binding/cleavage activity and anti-BVDV activity

A series of novel pyrazole fused heterocyclic derivatives were synthesized via a two-step procedure or a one-pot two step method, and their catalytic DNA cleavage abilities and anti-BVDV activities were also evaluated. The results obtained indicated that compounds 3b–3c could catalyze the cleavage of supercoiled DNA (pUC 19 plasmid DNA) to nicked DNA under physiological conditions with high yields via a hydrolytic mechanism. The studies on anti-viral activities against bovine viral diarrhea virus (BVDV) demonstrated that some of the pyrazole derivatives showed pronounced anti-BVDV activity with interesting EC50 values and no significant cytotoxicity. Among them, compound 3l showed the highest antiviral activity (EC50 = 0.12 μmol/L) and was 10 fold more than that of the positive control ribavirin (EC50 = 1.3 μmol/L), which provided a potential candidate for the development of anti-BVDV agents.

We have synthesized some novel pyrazoles fused heterocyclic derivatives. With 3b-Cu2+ and 3c-Cu2+, the plasmid DNA could be cleaved completely. Meanwhile, Compound 3l showed the highest antiviral activity (EC50 = 0.12 μmol/L).Figure optionsDownload as PowerPoint slide