精油—甲氧基丙烯酸酯雜合物的設(shè)計(jì)合成及抑菌活性測(cè)定
[Abstract]:Essential oil is a secondary metabolite of aromatic plants, with antibacterial, anti-inflammatory and other activities. However, there are few reports on chemical modification and structural modification of essential oil active components at home and abroad. On the other hand, methoxy acrylate fungicides are a kind of bactericides with high efficiency, wide spectrum and environmental friendliness developed in the 1980s. At present, they still occupy an important share in the world market of agricultural fungicides. Therefore, the development of new structure of this kind of fungicides is still a hot field. In this paper, the essential oil active group was introduced into the side chain of methoxypropionate in order to obtain the compounds with better bacteriostatic activity under the condition of retaining the bridge part and the pharmacophore part of methoxypropionate fungicides. The main contents are as follows: 1. A series of essential oil-methoxy acrylate hybrids were designed based on the structural characteristics of essential oil and methoxy acrylate. The intermediates of methoxyl acrylate, such as (E)-2- (bromomethyl) phenyl) -3-methoxy methyl acrylate, were prepared from o-methylphenylacetic acid and o-methylacetophenone as starting materials. The intermediate I was then hybridized with essential oil monomers such as thymol, carvingol and eugenol to prepare the target compound essential oil-methoxy acrylate hybrid II, structure via ~ 1HNMRs. ~ (13) CNMR and LC-MS were used to confirm the results. 2. With pyridamole as the positive control, 12 kinds of bacteria, such as Chlorophyllum, Brassica, Peach Brown rot and Rice blast fungus, were selected as the tested strains by the method of mycelium growth rate in vitro. The antimicrobial activity of target compounds, essential oil monomers and intermediates were tested. The results showed that under the concentration of 100 mg/L, compound II-1 had better antibacterial activity against three pathogens, such as Sclerotinia sclerotiorum, compared with the positive control. Compound II-2 showed excellent inhibitory activity against 5 kinds of pathogens, such as rice blast fungus, and compound II-7 showed good inhibitory activity against 8 kinds of pathogens such as Trichoderma. The inhibition rate of Peach brown rot pathogen and rice blast fungus were higher than 933%. In the further activity test, the compound II-2 showed very good bacteriostatic activity. The EC_50 value of compound II-2 was 0.25 mg/L,0.64 mg/L, for the three pathogens of Trichoderma, Sclerotinia sclerotiorum and Rice blast, respectively. 0. 96 mg/L, was superior to the control drug pyridamole. The compound II-1,II-2,II-3,II-7 is of significance for further study on the EC_50 value of Sclerotinia sclerotiorum in rape, which is lower than the EC_50 value of azoxystrobin in the presence of 18.75 mg / L.
【學(xué)位授予單位】:華中農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TQ455.4
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