含取代噁唑结构的新型吡唑肟衍生物的合成与生物活性

为了发现具有良好生物活性的吡唑肟化合物,以唑螨酯为先导化合物,在吡唑肟中引入取代噁唑结构,设计并制备了20个未见文献报道的新型吡唑肟衍生物,利用1H NMR,13C NMR和元素分析确证了目标产物的结构.生物活性测试结果显示,部分目标化合物在500和100μg/mL浓度下对粘虫或蚜虫表现出优良的杀虫活性,其中5-(3-氟苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9j)、5-(4-氟苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9k)、5-(4-叔丁基苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9r)和5-(4-甲氧基苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氯苯基)噁唑-2-基]甲基}肟(9s)在浓度为100μg/mL时对粘虫的防治效果均达100%,5-(4-溴苯氧基)-1,3-二甲基-1H-吡唑-4-甲酰基-O-{[5-(4-氟苯基)噁唑-2-基]甲基}肟(9g)和9s在浓度为100μg/mL时对蚜虫的杀灭活性均为100%.此外,化合物9s在500μg/mL时对朱砂叶螨的防治效果为70%.

Synthesis and Biological Activities of Novel Pyrazole Oxime Derivatives Bearing an Oxazole Moiety

In search of novel pyrazole oximes with good biological activities,twenty pyrazole oxime compounds were prepared by introducing an oxazole unit into pyrazole oxime based on the structure of fenpyroximate.The structures of the target compounds were confirmed by 1H NMR,l3C NMR and elemental analysis.Preliminary bioassay displayed that some target compounds had wonderful insecticidal activities against Oriental armyworm or Aphis medicaginis at the concentrations of 500 and 100μg/mL.At the concentration of 100 μg/mL,5-(3-fluorophenoxy)-1,3-dimethyl-1H-pyrazole-4-formyl-(7-(5-(4-chlorophenyl)oxazol-2-yl)methyl)oxime(9j),5-(4-fluorophenoxy)-1,3-dimethyl-1H-pyrazole-4-formyl-O-(5-(4-chlorophenyl)-oxazol-2-yl-methyl)oxime(9k),5-(4-/-butylphenoxy)-1,3-dimethyl-1H-pyrazole-4-formyl-0-(5-(4-chlorophenyl)oxazol-2-yl-methyl)oxime(9r)and 5-(4-methoxyphenoxy)-1,3-dirnethyl-l/7-pyrazole-4-fdrmyl-O-(5-(4-chIorophenyl)oxazol-2-yl-methyl)oxime(9s)showed 100%mortality rate against Oriental armyworm,and 5-(4-bromophenoxy)-1,3-dimethyl-1/7-pyrazole-4-formyl-O-(5-(4-fluorophenyl)oxazol-2-yl)methyl-oxime(9g)and 9s exhibited 100%insecticidal property against Aphis medicaginis.Additionally,compound 9s possessed 70%insecticidal activity against Tetranychus cinnabarinus at 500 ng/mL.