含三氟甲基吡啶结构的酰胺类衍生物的合成、表征及生物活性研究

Synthesis,Characterization,and Biological Activity of Novel Amide Derivatives Containing Trifluoromethylpyridine Moieties

合成了一系列含三氟甲基吡啶结构的酰胺衍生物,并测试了它们对水稻白叶枯病菌(Xanthomonas oryzae pv.oryzae)、柑橘溃疡病菌(Xanthomonas axonopodis pv.citri)、烟草青枯病菌(Ralstonia solanacearum)的体外抑菌活性和对小菜蛾(Plutella xylostella)的杀虫活性.结果表明,部分化合物表现出优异的抑菌活性.如2-((3-氯-5-(三氟甲基)吡啶-2-基)氧基)-N-(4-氟-2-甲基苯基)乙酰胺(6d)对水稻白叶枯病菌的EC_(50)值为54.1 mg·L^(-1),低于叶枯唑(EC50=59.6 mg·L-1)和噻菌酮(EC_(50)=86.3 mg·L^(-1)).2-((3-氯-5-(三氟甲基)吡啶-2-基)氧基)-N-(4-氟-3(三氟甲基)苯基)乙酰胺(6h)和2-((3-氯-5-(三氟甲基)吡啶-2-基)氧基)-N-(5,6-二氯吡啶-3-基)乙酰胺(6z)对柑橘溃疡病菌的抑制活性(EC_(50)值为51.2和60.7 mg·L^(-1))均高于商品药剂叶枯唑(EC_(50)=76.3 mg·L^(-1))和噻菌酮(EC_(50)=101.7 mg·L^(-1)).N-(2-氯-4-氟苯基)-2-((3-氯-5-(三氟甲基)吡啶-2-基)氧基)乙酰胺(6e)对烟草青枯病菌的抑菌活性略高于噻菌酮(EC_(50)=79.0 mg·L^(-1)),EC_(50)值为74.9 mg·L^(-1).此外,化合物6e和2-((3-氯-5-(三氟甲基)吡啶-2-基)氧基)-N-(3-异丙基苯基)乙酰胺(6k)在浓度为500 mg·L^(-1)时表现出中等程度的杀小菜蛾活性.

A series of novel trifluoromethylpyridine amide derivatives were synthesized and evaluated in vitro for their antibacterial activity against Xanthomonas oryzae pv.oryzae(Xoo),Xanthomonas axonopodis pv.citri(Xac),and Ralstonia solanacearum,and insecticidal activity against Plutella xylostella.Some of the compounds showed promising antibacterial activity.In particular,the half maximal effective concentration(EC_(50))of 2-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)oxy)-N-(4-fluoro-2-methylphenyl)acetamide(6d)was 54.1 mg•L^(–1) against Xoo,which was slightly lower than the bismerthiazol(59.6 mg•L^(–1))and thiodiazole copper(86.3 mg•L^(–1))positive controls.2-((3-Chloro-5-(trifluoromethyl)pyridin-2-yl)oxy)-N-(4-fluoro-3-(trifluoromethyl)phenyl)acetamide(6h)and 2-((3-chloro-5-(trifluoro-methyl)pyridin-2-yl)oxy)-N-(5,6-dichloropyridin-3-yl)-acetamide(6z)exhibited much higher activity against Xac(EC_(50)51.2 and 60.7 mg•L^(–1),respectively)than bismerthiazol(76.3 mg•L^(–1))and thiodiazole copper(101.7 mg•L^(–1)).N-(2-Chloro-4-fluorophenyl)-2-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)-oxy)acetamide(6e)showed good bioactivity against R.solanacearum with an EC_(50)(74.9 mg•L^(–1))lower than thiodiazole copper(79.0 mg•L^(–1)).6e and 2-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)oxy)-N-(3-isopropylphenyl)acetamide(6k)at 500 mg•L^(–1) exhibited moderate insecticidal activity against P.xylostella.