Synthesis and Bioactivities Evaluation of Novel N-Pyridylpyrazole Derivatives with 1,2,3-Triazole and Quinazolin-4(3H)-one Substructures
摘要:
Two series of N-pyridylpyrazole derivatives containing 1,2,3-triazole and quinazolin-4(3H)-one substructures were designed and synthesized. In total, 18 novel compounds were prepared, and all compounds were characterized by H-1 NMR, C-13 NMR and elemental analysis (EA). Preliminary bioassay results revealed that a few of new compounds with quinazolin-4(3H)-one moiety exhibited good insecticidal activity against the oriental armyworm (Mythimna separata). In addition, the compounds Ia-h with 1, 2, 3-triazole moiety showed broad-spectrum antifungal activities against Fusarium oxysporum f.sp.cucumerinum, Cercospora arachidicola Hori, Botryosphaeria dothidea, Alternaria solani, Gibberella zeae and Phytophthora capsici at 50 [mu g/mL concentration. The EC50 values of Ib and If against Botryosphaeria dothidea were 13.9 and 11.0 mu g/mL, respectively, which were comparable to Chlorothalonil. These results indicated the potential application of N-pyridylpyrazole derivatives as fungicide in further study.
In this study, a series of new quinazolinonederivativescontaining amides was designed and synthesized using the principle of active splicing. These compounds were tested for their biological activity and found to possess some antibacterial activity. Among these, compound 18 showed good activity against Pseudomonas syringae pv. actinidiae (Psa) in vitro with an EC50 value of 39.2 mg/L, which was superior