CN116730885A - 一类含异丙醇胺亚结构的化合物及其制备方法和应用 - Google Patents
一类含异丙醇胺亚结构的化合物及其制备方法和应用 Download PDFInfo
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- C07C323/24—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atoms of the thio groups bound to acyclic carbon atoms of the carbon skeleton
- C07C323/25—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atoms of the thio groups bound to acyclic carbon atoms of the carbon skeleton the carbon skeleton being acyclic and saturated
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Abstract
本发明涉及一类含异丙醇胺亚结构的化合物及其制备方法和应用。该化合物具有如通式(I)所示的结构:
Description
技术领域
本发明涉及药物化学技术领域,尤其是一类含异丙醇胺亚结构的化合物及其制备方法和应用。
背景技术
由黄单胞菌Xanthomonas oryzae pv.oryzae(Xoo)和Xanthomonas oryzaepv.oryzicola(Xoc)引起的水稻白叶枯病(BLB)和水稻细菌性条斑病(BLS),是水稻的两种主要细菌性病害,而且是目前尚未解决的问题,严重威胁水稻生产安全,导致水稻产量减少20~50%,水稻细菌性病害的防治主要依靠传统的化学抗菌剂。柑橘细菌性溃疡病(Xanthomonas axonopodis pv.Citri)会导致柑橘腐烂,是世界上最著名的、特别难管理和表现的农业病害。这些难治性细菌感染极其难以控制,从而逐年给全球农业造成巨大的经济损失。目前,很少有有效的杀菌剂可以控制这些感染。虽然大剂量和频繁使用传统农药,包括主要的噻菌铜(TC)和叶枯唑(BT),可以减轻植物细菌感染,但在已经脆弱的生态系统和农产品中,病原体的快速抗性和有害残留物的积累具有不利影响。因此,创制出新型高效、低毒、安全的绿色农药具有十分重要的意义。
硫醚是一种有机硫化合物,不仅具有多种生物活性,而且还可以为进一步的衍生化(如S到S=O和S(=O)2)和环境提供反应位点。其中,含有亚矾骨架的硫醚衍生物被人们广泛研究,亚砜是一种重要的药用和农业活性单位,含有硫化物、亚砜和砜结构的化合物已被广泛应用于材料、医药和农药等,具有广泛的生物活性,如杀虫、抗癌、抗细菌、抗真菌和除草性能。
为了寻找高效杀菌的活性化合物,本发明以4-氯-苯硫酚为母体,接环氧丙烷,再用各种伯胺、仲胺开环得到含异丙醇胺亚结构的苯硫基、苯亚矾基类化合物,测试其生物活性,为新农药的研发和创制提供重要的科学基础。
苯硫基、苯亚砜基类化合物生物活性研究进展如下:
2022年,Cai等(Apfel,C.;Banner,D.W.;Bur,D.;Dietz,M.;Hirata,T.;Hubschwerleh,C.;Locher,H.;Page,M.G.P.;Pirson,W.;Rossé,G.;Specklin,J.-L.,Hydroxamic Acid Derivatives as Potent Peptide Deformylase Inhibitors andAntibacterial Agents.Journal of Medicinal Chemistry 2000,43,2324-2331.)设计、合成了一系列含苯基吡啶的α-三氟硫苯甲醚衍生物,以发现具有良好活性的新型除草剂化合物。对温室除草活性的初步筛选表明,目标化合物均表现出较好的除草活性。其中,在37.5g a.i./hm2,化合物11a对阔叶杂草反枝苋(Amaranthus retroflexus)、阿拜隆(Abutilon theofrasti)和旱獭(Eclipta prostrate)的抑制活性均大于85%,略高于氟美沙芬。在150g a.i./hm2条件下,化合物11a和11b对阔叶杂草AT、AR和EP具有80%的抑制活性
2018年,Li等(Li,P.;Tian,P.;Chen,Y.;Song,X.;Xue,W.;Jin,L.;Hu,D.;Yang,S.;Song,B.,Novel bisthioether derivatives containing a 1,3,4-oxadiazolemoiety:design,synthesis,antibacterial and nematocidal activities.Pest ManagSci 2018,74,844-852.)设计合成了一系列含有1,3,4-噁二唑部分的新型双硫醚衍生物,并评估它们的抗菌和杀线虫活性。其中,化合物8对水稻白叶枯病(Xoo)、水稻细菌性叶斑病(Xoc)和柑橘溃疡病(Xac)表现出最佳的抗菌活性,其EC50值分别为4.82、11.15和16.57μgmL-1,优于对照药噻菌铜和叶枯唑。
2018年,Dai等(Dai,P.;Luo,K.;Yu,X.;Yang,W.-C.;Wu,L.;Zhang,W.-H.,Tert-Butyl Nitrite Mediated Expeditious Methylsulfoxidation of Tetrazole-amineswith DMSO:Metal-free Synthesis of Antifungal Active Methylsulfinyl-1H-tetrazole Derivatives.Advanced Synthesis&Catalysis 2018,360,468-473.)以叔丁基亚硝酸盐介导的四唑胺甲基亚基化反应,为C-S(O)键的构建提供了一个快速和操作简单的程序,并初步评估了目标化合物对四种植物病原真菌的抑菌活性。部分化合物在浓度为5μg/mL(SI)时表现出潜在的抗真菌活性。结果表明,含有3,4-二氯取代基的化合物7a的EC50值低至1.3701μg/mL,与阳性对照(Boscalid EC50=2.9767μg/mL)相比具有较优活性。化合物7b(EC50=2.5439μg/mL)具有较好的抗真菌活性
2016年,Yu等(Yu,X.;Liu,Y.;Li,Y.;Wang,Q.,Design,Synthesis,Acaricidal/Insecticidal Activity,and Structure-Activity Relationship Studies of NovelOxazolines Containing Sulfone/Sulfoxide Groups Based on the SulfonylureaReceptor Protein-Binding Site.J Agric Food Chem 2016,64,3034-40.)设计合成了一系列含砜/亚矾基团的2,4-二苯基-1,3-恶唑啉类甲壳素合成抑制剂(CSIs)。对化合物的杀螨、杀虫活性进行了活性测试。大部分目标化合物对朱砂叶螨幼虫和虫卵均有较好的杀螨活性。特别是化合物6a和6b(分别含有4-氯苯基和4-氟苯基亚矾基),在浓度为2.5mg L-1时表现出优异的杀螨虫活性,且高于商品药乙螨唑的活性。1mg L-1时死亡率分别为87%和83%,均优于乙螨唑。
发明内容
本发明的目的之一提供了一类含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物。
本发明的另一目的是提供了制备上述化合物或其立体异构体、或其盐或其溶剂化物的中间体化合物及其制备方法。
本发明还有一目的是提供了一种含有上述化合物或其立体异构体、或其盐或其溶剂化物的组合物。
本发明还有一目的是提供了上述化合物或其立体异构体、或其盐或其溶剂化物,或所述组合物的用途。
本发明另一目的是提供了利用上述化合物或其立体异构体、或其盐或其溶剂化物,或所述组合物防治农业病虫害的方法。
为实现上述目的,本发明采用了下述技术方案:
一类含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物,该化合物具有如通式(I)所示的结构:
其中,R1和R2各自独立的选自氢、二甲基、二乙基、丙基、二丙基、环丙基、苯基、甲苯基、三氟甲基苯基、甲氧基苯基、氟苯基、甲苯基、苯亚甲基、已苯基:
R1和R2相连成为脂肪杂环或芳香杂环,优选为下述基团:
本发明还提供了一种制备所述的含异丙醇胺亚结构的苯硫基、苯亚砜基类化合物或其立体异构体、或其盐或其溶剂化物的中间体化物:
本发明还提供了所述的含异丙醇胺亚结构的苯硫基、苯亚矾基类化合物或其立体异构体、或其盐或其溶剂化物的制备方法,包括下述步骤:
其中,R1和R2各自独立的选自氢、任意取代或未取代的烷基、氨基、任意取代或未取代的烷氧基、任意取代或未取代的环烷基、任意取代或未取代的芳基、任意取代或未取代的杂芳基中的一个或多个、任意取代或未取代的苄基、任意取代或未取代的α-甲基-苄基;R1和R2各自独立的选自氢、任意取代或未取代的烷基、氨基,任意取代或未取代的烷氧基、任意取代或未取代的环烷基、任意取代或未取代的芳基、任意取代或未取代的杂芳基中的一个或多个、任意取代或未取代的苄基、任意取代或未取代的α-甲基-苄基;
本发明还提供了一种组合物,其含有所述的化合物或其立体异构体、或其盐或其溶剂化物,以及农业上可用的助剂或杀菌剂、杀虫剂或除草剂;优选地,所述组合物的剂型选自乳油(EC)、粉剂(DP)、可湿性粉剂(WP)、颗粒剂(GR)、水剂(AS)、悬浮剂(SC)、超低容量喷雾剂(ULV)、可溶性粉剂(SP)、微胶囊剂(MC)、烟剂(FU)、水乳剂(EW)、水分散性粒剂(WG)。
所述的化合物或其立体异构体、或其盐或其溶剂化物,或所述的组合物可用于防治农业病虫害,优选地,所述农业病虫害为植物细菌性或真菌性病害;更优选地,所述农业病虫害为植物叶枯病和植物溃疡病;最优选地,所述农业病虫害为水稻白叶枯病、黄瓜白叶枯病、魔芋白叶枯病、柑橘溃疡病、葡萄溃疡病、番茄溃疡病、猕猴桃溃疡病、芒果角斑病、苹果溃疡病、黄瓜灰霉病菌、辣椒枯萎病原菌、油菜菌核病菌、小麦赤霉病菌、马铃薯晚疫病菌。
本发明还提供了一种防治农业病虫害的方法,使所述的化合物或其立体异构体、或其盐或其溶剂化物,或所述的组合物作用于有害物或其生活环境;优选地,所述农业病虫害为植物细菌性或真菌性病害;更优选地,所述农业病虫害为水稻白叶枯病、烟草青枯病菌、黄瓜白叶枯病、魔芋白叶枯病、柑橘溃疡病、葡萄溃疡病、番茄溃疡病、猕猴桃溃疡病、芒果角斑病、苹果溃疡病、黄瓜灰霉病菌、辣椒枯萎病原菌、油菜菌核病菌、小麦赤霉病菌、马铃薯晚疫病菌。
本发明还提供了一种用于保护植物免受农业病虫害侵害的方法,其包括其中使植物与所述的化合物或其立体异构体、或其盐或其溶剂化物,或所述的组合物接触的方法步骤。
此处用到的术语“烷基”是包括具有特定数目碳原子的支链和直链饱和烃基。例如“C1-10烷基”(或亚烷基)目的是C1、C2、C3、C4、C5、C6、C7、C8、C9和C10烷基。另外,例如“C1-6烷基”表示具有1到6个碳原子的烷基。烷基可为非取代或取代的,以使一个或多个其氢原子被其它化学基团取代。烷基的实施例包括但不限于甲基(Me)、乙基(Et)、丙基(如正丙基和异丙基)、丁基(如正丁基、异丁基、叔丁基)、戊基(如正戊基、异戊基、新戊基)及其类似物。
此处用到的术语“取代的”指的是在指定原子或基团上的任意一个或多个氢原子以选择的指定基团取代,前提是不超过指定原子的一般化合价。如果没有其它说明,取代基命名至中心结构。例如,可以理解的是当(环烷基)烷基是可能的取代基,该取代基至中心结构的连接点是在烷基部分中。此处使用的环双键是形成于两个临近环原子之间的双键(如C=C、C=N或N=N)。当提到取代时,特别是多取代时,指的是多个取代基在指定基团上的各个位置上取代,如二氯苄基指的是2,3-二氯苄基、2,4-二氯苄基、2,5-二氯苄基、2,6-二氯苄基、3,4-二氯苄基和3,5-二氯苄基。
取代基和变量的组合是允许的,仅当这些组合产生稳定的化合物或有用的合成中间体。稳定的化合物或稳定结构暗示所述化合物以有用的纯度从反应混合物分离出来时是足够稳定的,随之配制形成有效的治疗试剂。
术语“芳基”指的是在环部分具有6到12个碳原子的单环或双环芳香烃基,如苯基和萘基,每个可被取代的。
术语“杂芳基”指的是取代和非取代芳香5或6元单环基团,9-或10-元双环基团,和11到14元三环基团,在至少一个环中具有至少一个杂原子(O,S或N),所述含杂原子的环优选具有1、2或3个选自O、S和N中的杂原子。含杂原子的杂芳基的每个环可含一个或两个氧或硫原子和/或由1到4个氮原子,前提是每个环中杂原子的总数是4或更少,且每个环具有至少一个碳原子。完成双环和三环基团的稠合环可仅含有碳原子,并可以是饱和、部分饱和或不饱和。氮可任选被氧化及被季铵化。双环或三环的杂芳基必须包括至少一个全芳香环,氮其它稠合环可为芳香性或非芳香性的。杂芳基可在任何环的任何可利用氮或碳原子上连接。
示例性单环杂芳基包括吡咯基、吡唑基、吡唑啉基、咪唑基、噁唑基、异噁唑基、噻唑基、噻二唑基、呋喃基、噻吩基、噁二唑基、吡啶基、吡嗪基、嘧啶基、哒嗪基、三嗪基及其类似物。
示例性双环杂芳基包括吲哚基、苯并噻唑基、苯并二氧杂环戊烯基、苯并噁唑基、苯并噻吩基、喹啉基、四氢异喹啉基、异喹啉基、苯并咪唑基、苯并呋喃基、吲哚嗪基、苯并呋喃基、色酮基、香豆素基、苯并呋喃基、噌啉基、喹喔啉基、吲唑基、吡咯并吡啶基、氟代吡啶基、二氢异吲哚基、四氢喹啉基及其类似物。
如果没有其它说明,本发明的化合物理解为包括游离态和其盐。术语“盐”表示以无机和/或有机酸和碱形成酸式和/或碱式盐。另外,术语“盐可包括两性离子(内盐),如当式I化合物含有碱性片段如胺或吡啶或咪唑环,和酸式片段如羧酸。药物上可接受的(即非毒性、生理学上可接受的)盐是优选的,如可接受的金属和胺盐,其中阳离子没有显著贡献毒性或盐的生物活性。然而,其它盐可是有用的,如在制备过程中采用分离或纯化步骤,因此也包含于本发明范围中。
当提到取代基为烯基、烷基、芳基、苄基、环烷基时,或这些取代基具体的为某个具体的烯基、烷基、芳基、苄基、环烷基时,指的是一个到三个上述取代基。如氯苄基指的是一个到三个氯取代的苄基。
通过采用上述技术方案,本发明以4-氯苯硫酚为起始原料,合成一系列含异丙醇胺亚结构的苯硫基、苯亚矾基类化合物,且发现该化合物对致病植物病原细菌具有良好的抑制作用,针对病原细菌[如水稻白叶枯病菌(Xanthomonas oryzae pv.oryzae,Xoo)、柑橘溃疡病菌(Xanthomonas axonopodis pv.citri,Xac)和水稻细菌性条斑病菌(Xanthomonasoryzae pv.oryzicola,Xoc)和芒果角斑病菌(Xanthomonascampestrispv.mangiferaeindicae,Xcm)]均具有良好的抑制效果,为新农药的研发和创制提供重要的科学基础。
实施例
下面通过实施例对本发明作进一步说明。应该理解的是,本发明实施例所述方法仅仅是用于说明本发明,而不是对本发明的限制,在本发明的构思前提下对本发明制备方法的简单改进都属于本发明要求保护的范围。实施例中用到的所有原料和溶剂均为市售产品。
实施例1:2-(((4-氯苯基)硫)甲基)环氧乙烷
将4-氯苯硫酚(13.8mmol)和K2CO3(16.6mmol)及50mL DMF加入到100mL圆底烧瓶中,在冰浴条件下搅拌20分钟,然后在体系中缓慢滴加环氧溴丙烷(27.7mmol),冰浴反应1h后,结束反应;使用乙酸乙酯(100mL)进行萃取,再用饱和NH4Cl水溶液(4×80mL)洗涤,经无水Na2SO4干燥,脱溶,柱层析(PE∶EA=50∶1,V/V),得黄色液体,产率64.7%。其核磁数据为:1H NMR(400MHz,CDCl3)δ7.39(t,J=1.8Hz,1H,Ar-H),7.30-7.26(m,1H,Ar-H),7.25-7.17(m,2H,Ar-H),3.21-3.12(m,2H,S-CH2),3.05-2.97(m,1H,-O-CH),2.83-2.78(m,1H,-O-CH2),2.58-2.56(m,1H,-O-CH2).
实施例2:2-(((4-氯苯基)亚磺酰基)甲基)环氧乙烷
将实施例1中2-(((4-氯苯基)硫)甲基)环氧乙烷(2.5mmol)溶于5mL THF和6mLH2O中,55℃下搅拌20分钟,然后在体系中加H2O2(17.4mmol)。反应一段时间后,补加溶于0.1g过氧化氢的钼酸铵(0.006g),半小时后结束反应。使用二氯甲烷和水(3×20mL)洗涤,脱溶,经无水Na2SO4干燥,柱层析(PE∶EA=25∶1,V/V),得白色液体,产率77.2%。其核磁数据为:1H NMR(400MHz,CDCl3)δ7.63-7.57(m,2H,Ar-H),7.54-7.48(m,2H,Ar-H),3.40-3.06(m,1H,-O-CH),3.06-2.81(m,3H,S-CH2 &-O-CH2 ),2.68-2.55(m,1H,-O-CH2 );13C NMR(101MHz,CDCl3)δ142.0,141.1,137.6,137.6,129.7,129.6,125.5,125.2,61.2,58.7,47.0,46.2,46.0,45.2.
实施例3:1-(苄氨基)-3-((4-氯苯基)硫)异丙醇(15)
将2-(((4-氯苯基)硫)甲基)环氧乙烷(2.49mmol)、K2CO3(2.49mmol)和苄胺(4.98mmol)溶于10mL异丙醇中并投入到15mL反应瓶中,55℃温下搅拌。TLC追踪,待反应完全后,用乙酸乙酯和饱和氯化钠(3×20mL)洗涤,取有机相,经无水Na2SO4干燥后,脱溶,再经柱层析(CH2Cl2∶CH3OH=100∶1,V/V),得白色固体,收率72.4%。其核磁数据为:1H NMR(400MHz,CDCl3)δ7.27-7.22(m,2H,Ar-H),7.21-7.11(m,7H,Ar-H),3.75-3.62(m,3H,NH-CH2 &-O-CH),2.90(d,J=6.2Hz,2H,S-CH2),2.74-2.70(m,2H,CH-CH2 &NH),2.56-2.51(m,1H,CH-CH2 );13C NMR(101MHz,CDCl3)δ139.4,134.3,132.24130.8,129.1,128.5,128.1,127.2,68.1,53.6,53.2,39.1.
实施例4:1-(苄氨基)-3-((4-氯苯基)亚磺酰基)异丙醇(31)
将2-(((4-氯苯基)亚磺酰基)甲基)环氧乙烷(0.46mmol)、K2CO3(0.23mmol)和苄胺(0.92mmol)溶于4mL异丙醇中并投入到15mL反应瓶中,50℃温下搅拌。TLC追踪,待反应完全后,用乙酸乙酯和饱和氯化钠(3×20mL)洗涤,取有机相,经无水Na2SO4干燥后,脱溶,再经柱层析(CH2Cl2∶CH3OH=100∶1,V/V),得白色固体,收率32%。其核磁数据为:1H NMR(400MHz,CDCl3)δ7.59-7.49(m,2H,Ar-H),7.48-7.41(m,2H,Ar-H),7.30-7.24(m,3H,Ar-H),7.24-7.19(m,2H,Ar-H),4.30-4.01(m,1H,-O-CH),3.83-3.66(m,2H,NH-CH2 ),3.03-2.90(m,2H,S-CH2),2.87-2.76(m,1H,CH-CH2 ),2.75-2.53(m,2H,CH-CH2 &NH);13C NMR(101MHz,CDCl3)δ142.1,142.0,139.5,137.5,137.3,129.7,128.6,128.2,127.3,127.2,125.6,125.4,66.4,64.7,61.8,61.6,53.9,53.8,53.7,53.5.
其它目标化合物,采用相应的原料或取代基,参照上述实施例步骤合成。
合成的含异丙醇胺亚结构的苯硫基、苯亚砜基类化合物的结构及核磁共振氢谱和碳谱数据如表1所示,物化性质如表2所示。
表1本申请化合物的核磁共振氢谱和碳谱数据
表2本申请化合物的理化性质
药理实施例1:
EC50(median effective concentration)是评价植物病原菌对化合物敏感性的重要指标,同时也是对目标化合物作用机制研究时,化合物浓度设置的重要参数。在浓度梯度实验中,采用二倍稀释法设定合适的5个浓度,最后将药剂对植物病原菌的抑制率、药剂浓度换算成对数值,通过SPSS软件回归分析得到毒力曲线,计算出EC50。
采用浊度法测试目标化合物对植物病原菌的有效中浓度EC50,试验对象为水稻白叶枯病菌(Xoo)、柑橘溃疡病菌(Xac)、水稻条斑病菌(Xoc)和芒果角斑病菌(Xcm)。DMSO溶解在培养基中作为空白对照。将水稻白叶枯病菌(水稻白叶枯病原菌在M210固体培养基)放到NB培养基中,在28℃、180rpm恒温摇床中振荡培养到对数生长期备用;将柑橘溃疡病菌(在M210固体培养基上)放到NB培养基中,在28℃、180rpm恒温摇床中振荡培养到对数生长期备用。将药剂(化合物)配置成不同浓度(例:100,50,25,12.5,6.25μg/mL)的含毒NB液体培养基5mL加入到试管中,分别加入40μL含有植病细菌的NB液体培养基,在28℃、180rpm恒温摇床中振荡,其水稻白叶枯病原菌培养36h,柑橘溃疡病菌培养48h,水稻条斑病菌培养36h。将各个浓度的菌液在分光光度计上测定OD595值,并且另外测定对应浓度的含毒无菌NB液体培养基的OD595值。
较正OD值=合菌培养基OD值-无菌培养基OD值
抑制率%=[(校正后对照培养基菌液OD值-校正含毒培养基OD值)/校正后对照培养基菌液OD值]×100
本发明实施例辅以说明本发明的技术方案,但实施例的内容并不局限于此,目标化合物实验结果如表3所示。
表3本申请化合物对植物病原细菌的EC50
从表3中可以看出,在离体试验中,目标化合物22对植物致病病原菌(如水稻白叶枯病菌、柑橘溃疡病菌、水稻条斑病菌和芒果角斑病菌)表现出了良好的抑制活性。其中结构中含有苄基以及苯基的大部分化合物对水稻白叶枯病菌、柑橘溃疡病菌水稻条斑病菌和芒果角斑病的EC50都在10以内,尤其是化合物22对水稻白叶枯病菌和柑橘溃疡病菌都具有极为优异的活性,EC50分别为2.73和1.94μg/mL;同时,化合物26对水稻条斑病菌也表现出优异的抑制活性,EC50为2.30μg/mL。由此,可知此类化合物极具研究前景,可用于制备抗植物致病病原细菌农药。
药理实施例2:
基于化合物22对水稻白叶枯病菌显示出最好的活性(EC50为2.73μg/mL),进行了化合物22对水稻白叶枯病的活体盆栽实验,在此实验的基础上,在化合物22中加入助剂β-环糊精得到22@β-环糊精(摩尔比1∶1),结论发现其治疗活性和保护活性略有提高。具体实验步骤如下:保护活性:将化合物22、22@β-环糊精和对照药噻菌酮(20%含量制剂)分别用小于1%的Tween20溶液配成200μg/mL(有效成分)的含药溶液,再分别多配制两份浓度为200μg/mL的上述溶液,将配置好的药液分别喷在已经生长8周的水稻叶片表面,直到有液滴滴下为止;24h后,在叶片距离叶尖2cm处用沾有OD595=0.6-0.8范围内的水稻白叶枯病菌的剪刀把叶尖剪掉,设不加药剂的等量DMSO为对照,每个处理均有三个重复,14天后检查发病情况,记录水稻叶片的病斑长度及总长度,并计算其病情指数和防效。
首先测量每片叶子的斑点面积和整个叶子面积,然后测量整个斑点面积的百分比计算叶面积。其次,按照以下等级标准对这些叶子进行分类:1级,病斑面积不到整个叶子面积的5%。3级,病斑面积占全叶面积的6-10%;5级,病斑面积5占全叶面积的11-20%;7级,病斑面积占全叶面积的21-50%;9级,病斑面积占整个叶片面积的50%以上;
病情指数的计算方法如下:
病情指数=∑(每个等级的叶片数×相应等级)/(叶片总数×最高级)
防效计算方法如下:
防效%=(对照组病情指数-处理组病情指数)/对照组病情指数×100%
治疗活性:在叶片距离叶尖2cm处用沾有OD595=0.6-0.8范围内的水稻白叶枯病菌的剪刀把叶尖剪掉,24h后,将配好的上述药液喷在已经生长8周的水稻叶片表面,直到有液滴滴下为止,设不加药剂的等量DMSO为对照,每个处理均有三个重复,14天后检查发病情况,记录水稻叶片的病斑长度及总长度,并计算其病情指数和防效,计算方法同上。
本发明实施例辅以说明本发明的技术方案,但实施例的内容并不局限于此,目标化合物实验结果如表4所示。
表4本申请化合物以及加入β-环糊精后对水稻白叶枯病的保护和治疗活性
从表4中可以看出,在活体试验中,化合物22对水稻白叶枯病表现出了良好的治疗活性(38.10%)和保护活性(43.90%)。优于对照药噻菌酮(治疗活性33.33%;保护活性37.40%);实验发现当在化合物22中加入主体β-环糊精时,会使其活体活性略有提高,治疗活性提高到40.48%;保护活性提高到46.75%;由此,可知此类化合物极具研究前景,可用于制备高抗植物致病病原细菌农药。
药理实施例3:
基于化合物22对柑橘溃疡病菌显示出最优的活性(EC50为1.94μg/mL),进行了化合物22对柑橘溃疡病的活体盆栽实验,具体实验步骤如下:
保护活性:将化合物22、22@β-环糊精和对照药噻菌酮(20%含量制剂),分别用小于1%的Tween20溶液配成浓度为200μg/mL的药液。先将柑橘叶片正面用无菌针均匀的扎12个孔,然后将配置好的药液分别将滤纸润湿后贴到柑橘叶片表面扎孔处,不留气泡,等滤纸自然干燥掉落;24h后,将OD595=0.6-0.8范围内的柑橘溃疡病菌的溶液离心后调OD595=0.01,菌液润湿滤纸后,将其紧贴在伤口处,设不加药剂的等量DMSO对照,每个处理均有三个重复,14天后检查发病情况。观察柑橘叶片受伤处感病情况。
治疗活性:先将柑橘叶片正面用无菌针均匀的扎12个孔,将OD595=0.6-0.8范围内的柑橘溃疡病菌的溶液离心后调OD595=0.01,菌液润湿滤纸后,将其紧贴在伤口处。24h后,将化合物22、22@β-环糊精和对照药噻菌酮(20%含量制剂),分别用小于1%的Tween20溶液配成浓度为200μg/mL的药液,然后将配置好的药液分别将滤纸润湿后贴到柑橘叶片表面扎孔处,不留气泡,等滤纸自然干燥掉落。设不加药剂的等量DMSO对照,每个处理均有三个重复,14天后检查发病情况。观察柑橘叶片受伤处感病情况。
将叶片受伤处均匀剪下,每个组分称取100mg,然后将其浸泡在10mL(95%丙酮∶95%乙醇=1∶1)的混合溶液中,24小时候分别测吸光度值OD663和OD645,计算公式如下:
叶绿素a=(12.7×OD663-2.69×OD645)×0.1;叶绿素b=(22.9×OD645-4.68×OD663)×0.1
总叶绿素=(8.02×OD663+20.21×OD645)×0.1
防效%=(对照组感病范围-处理组感病范围)/对照组感病范围×100%
表4化合物22对柑橘溃疡病的保护活性和治疗活性
从表4中可以看出,在活体试验中,化合物22对柑橘溃疡病表现出了良好的(保护活性71.52%)和(治疗活性52.61%)。显著优于对照药噻菌酮(保护活性56.98%)和(治疗活性41.79%),在化合物22中加入助剂β-环糊精得到22@β-环糊精(摩尔比1∶1),结论发现其(治疗活性69.39%)和(保护活性81.36%)均有所提高。具有很好的研究前景。
Claims (9)
1.一类含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物,其特征在于:该化合物具有如通式(I)所示的结构:
其中,R1和R2各自独立的选自氢、任意取代或未取代的烷基、任意取代或未取代的环烷基、任意取代或未取代的芳基、任意取代或未取代的杂芳基中的一个或多个;或R1和R2可相互键合成环,所述环是取代或未取代的。
n=0、1。
2.根据权利要求1所述的含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物,其特征在于:R1和R2各自独立的选自氢、甲基、乙基、丙基、环丙基、苯基、 R1和R2相连成环时为下述基团:
3.根据权利要求1所述的含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物,其特征在于选自下述化合物:
4.一种制备权利要求1所述的含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物的中间体化合物,其特征在于如下所示:
5.权利要求1-3任一所述的含异丙醇胺亚结构的化合物或其立体异构体、或其盐或其溶剂化物的制备方法,其特征在于包括下述步骤:
优选地,进一步包括下述步骤:
或进一步包括下述步骤:
其中R1、R2、和n如权利要求1所述。
6.一种组合物,其特征在于含有权利要求1-3任一所述的化合物或其立体异构体、或其盐或其溶剂化物,以及农业上可用的助剂或杀菌剂、杀虫剂或除草剂;优选地,所述组合物的剂型选自乳油(EC)、粉剂(DP)、可湿性粉剂(WP)、颗粒剂(GR)、水剂(AS)、悬浮剂(SC)、超低容量喷雾剂(ULV)、可溶性粉剂(SP)、微胶囊剂(MC)、烟剂(FU)、水乳剂(EW)、水分散性粒剂(WG)。
7.权利要求1-3任一所述的化合物或其立体异构体、或其盐或其溶剂化物,或权利要求6所述的组合物在防治农业病虫害方面的用途,优选地,所述农业病虫害为植物细菌性或真菌性病害;更优选地,所述农业病虫害为植物叶枯病和植物溃疡病;最优选地,所述农业病虫害为水稻白叶枯病、黄瓜白叶枯病、魔芋白叶枯病、柑橘溃疡病、猕猴桃溃疡病、芒果角斑病、葡萄溃疡病、番茄溃疡病、苹果溃疡病、黄瓜灰霉病菌、辣椒枯萎病原菌、油菜菌核病菌、小麦赤霉病菌、马铃薯晚疫病菌、水稻条斑病菌。
8.一种防治农业病虫害的方法,其特征在于:使权利要求1-3任一所述的化合物或其立体异构体、或其盐或其溶剂化物,或权利要求6所述的组合物作用于有害物或其生活环境;优选地,所述有害物为植物细菌性或真菌性病害;更优选地,所述农业病虫害为水稻白叶枯病、黄瓜白叶枯病、魔芋白叶枯病、柑橘溃疡病、猕猴桃溃疡病、芒果角斑病、葡萄溃疡病、番茄溃疡病、苹果溃疡病、黄瓜灰霉病菌、辣椒枯萎病原菌、油菜菌核病菌、小麦赤霉病菌、马铃薯晚疫病菌、水稻条斑病菌。
9.用于保护植物免受农业病虫害侵害的方法,其包括其中使植物与权利要求1-3任一所述的化合物或其立体异构体、或其盐或其溶剂化物,或权利要求6所述的组合物接触的方法步骤。
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