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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 hydroiytic 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 EC_(50) values and no significant cytotoxicity.Among them,compound 31 showed the highest antiviral activity(EC_(50) = 0.12 μmoI/L) and was 10 fold more than that of the positive control ribavirin(EC_(50)= 1.3 μmol/L),which provided a potential candidate for the development of anti-BVDV agents.
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 may indicate 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 hydroiytic 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 EC 50 values and no significant cytotoxicity. Among them, compound 31 showed the highest antiviral activity (EC_ (50) = 0.12 μmol / L) and was 10 fold more than that of the positive control ribavirin EC 50 = 1.3 μmol / L), which provided a potential candidate for the development of anti-BVDV agents.