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新型吡唑酰胺类化合物的合成及抑菌活性的研究
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摘要
20世纪80年代以来,农药的研发进入了一个新的时期,农药开始朝着高效、低毒、环境友好的方向发展。杀菌剂作为现代农药的重要组成部分,在植物保护、农作物增产等方面发挥着不可替代的作用。吡唑甲酰胺类化合物含有吡唑基和酰胺基两种高活性的结构,往往具有高效、广谱的生物活性,在医药和农药领域有着广泛的应用。其中尤以日本三井化学研制开发的Penthiopyra(d吡噻菌胺)、住友化学工业公司开发的Furametpyr(呋吡菌胺)和最近上市的由先正达公司开发的Isopyrazam、Sedaxane为代表。此外,吡唑环上的四个取代位点使其具有结构多样性,由此可以得到不同活性,这也是引起人们关注的重要原因。
     为了寻找到新型高效的吡唑甲酰胺类杀菌剂,本文结合吡噻菌胺和呋吡菌胺的结构特点,根据亚结构拼接的原理,以1-甲基-3-二氟甲基吡唑-4-甲酸为原料,与杂环、氨基苯并杂环类、芳胺类化合物连接得到了32个吡唑-4-甲酰胺类化合物,其中31个化合物未见文献报道。化合物的结构均通过1~H-NMR、MS和IR表征。
     对所合成的化合物进行了活性测试,初步生测结果表明,在100 mg/L浓度下,目标化合物对小麦赤霉病菌(Fusarium graminerum)、棉花枯萎病菌(Fusarium oxysporum vasinfectum)、水稻稻瘟病菌(Pyricularia grisea)、番茄灰霉病菌(Botrytis cinerea)、苹果炭疽病菌(Colletotrichum gloeosporioides)及番茄早疫病菌(Altermaria sonali)等6种植物病原菌均有不同程度的抑菌活性,其中,G系列化合物的活性最高,对部分菌的抑菌率高于阳性对照嘧菌酯原药。此外化合物La、Lc对番茄灰霉菌抑制率分别达到87.1%、73.5%;化合物Ha对番茄灰霉病菌、苹果炭疽病菌和小麦赤霉病菌的抑制率为79%,77%,88.2%;化合物Hb对番茄灰霉病菌和苹果炭疽病菌的抑制率为87.5%,73.5%。
Since the 1980s, pesticide research and development have entered a full new stage, and the efficient, low toxicity, environment friendly have become the new trend. As an important part of modern pesticides, fungicides are playing an irreplaceable role in plant protection and crop production. Pyrazolecarboxamides are widely used in the field of medicine and pesticides, which often showed high efficiency and broad-spectrum biological activity for its pyrazolyl and amide group. The pesticide Penthiopyrad launched by Mitsui, Furametpyr launched by Sumitomo, and the pesticide Isopyrazam, Sedaxane both recently launched by Syngenta are the commercialized representatives. In addition, the four different positions of the pyrazole ring make the carboxamides has structural diversity and a variety of bioactivities, which is also a cause for concern.
     In order to create new and high-efficient pyrazolecarboxamide fungicides, this paper combining the structural characteristics of commercially pesticides Furamtpyr and Penthiopy- pyrad and according to substructure linking method, a series of pyrazole-4-carboxamide derivatives was synthesized by the reaction of 3-difluoromethyl-1-methyl-1H-pyrazole-4-car- boxylic acid with various amines, of which 31 derivatives are first studied. The structures of these compounds were confirmed by IR, 1H-NMR, and MS.
     The preliminary biological activities of the target compounds were tested, and the result indicated that all compounds showed different inhibitory activites against Fusarium graminer- um, Fusarium oxysporum vasinfectum, Pyricularia grisea, Botrytis cinerea, Colletotrichum gloeosporioides and Altermaria sonali at the concentration of 100 mg/L. The compounds of G series exhibited excellent bactriostasis, some compounds has a higher rate of inhibition and better control effect than the positive control Azoxystrobin. Thebactriostasisof compound La and Lc against Botrytis cinerea was up to 87.1% and 73.5% separately; the inhibition rate of Ha against Botrytis cinerea, Colletotrichum gloeosporioides, and Fusarium graminrum was 79%, 77% and 88.2% separately; and Hb against Botrytis cinerea and Colletotrichum gloeosporioides was 87.5% and 73.5% separately.
引文
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