CN102827009A - 一种水油兼溶的新型苯氧苯甲酸酯类衍生物制备及应用研究 - Google Patents
一种水油兼溶的新型苯氧苯甲酸酯类衍生物制备及应用研究 Download PDFInfo
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Abstract
Description
技术领域:
本发明涉及新型5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸酯类衍生物制备及除草活性。
背景技术:
传统农药剂型以乳油、可湿性粉剂、粉剂和颗粒剂为主,伴随着农药新剂型的研制与开发,未来会朝向水剂、水乳剂及微乳剂等方向发展,从这一发展趋势上来讲,这就对即将开发成功的新农药分子提出了更高的要求,不但要高效、低毒、安全及与环境友好,同时还希望药物分子具有一定的水溶性,如果药物分子具有良好的水溶性就可以配成水剂直接使用,这样既可以降低生产成本又可减少药物分子配成某种制剂时需要加入大量溶剂、表面活性剂、助剂及渗透剂等所带来的环境污染。从这方面来讲,药物分子良好的水溶性是有很重要的意义的。同时,具有一定水溶性和脂溶性的药物分子,也是药物有效穿过生物膜所必须的。
药物无论是表皮吸收还是其他途径吸收,都需要以分子的形式穿过屏障膜。药物需首先溶解,且如果药物具有理想的生物药学特性,它从高浓度的区域扩散到低浓度的区域,跨过细胞膜进入到循环系统。所有的生物膜含有脂类作为主要成份。生物膜结构中起主导作用的分子都具有含有磷酸盐的高极性的链端结构,并且,在大多数情况下,两条高度疏水的碳氢链。生物膜具有双层结构,亲水链端结构面向两侧的水相区域。非常亲水的药物无法穿过生物膜的脂质层而非常疏水性的药物因为相似相溶的原因作为生物膜的一部分停留其中,从而不能有效进入内部的细胞质。
大量的专利文献报道了含氟二苯醚类除草剂结构,该类除草剂具有用药量少、持效期长、杀草谱广,能防治多种阔叶杂草等优点。其中某些品种为水、旱地兼用的除草剂,但大多数品种为旱地使用的除草剂,主要用于棉花、花生、大豆、玉米、果树、蔬菜、烟草、水稻等作物中防治马齿苋、鸭趾草、苍耳、龙葵、粟米草等多种阔叶杂草,其中有些旱地使用的除草剂对禾本科杂草狗尾草、稷属、野高梁等有时也有效。其中典型的商品化品种三氟羧草醚、虎威等应用广泛、用量大,是大豆田主要除草剂品种。目前已开发的剂型有乳油、水剂、可湿性粉剂、微乳剂等。同时在制剂的配制及使用过程中常添加助剂以增强药效,以英国捷利康公司开发的虎威为例,登记的为25%的虎威水剂,除了在农药生产过程中会加入各类表面活性剂外,在实际配制过程中又加入了30%的离子表面活性剂及其它助剂,通过这种方法配成的制剂虽然可以增加药效在杂草叶面的粘着力,降低表面张力,同时还可以减少药液飘逸,进而能提高药效,但是因为加入了大量的表面活性剂、助剂等,必然会造成对环境的污染。未来除草剂的研究开发不仅要考虑到生物活性、作用机理、成本,更要考虑与环境的相容性。所以为了寻找高效、安全且与环境友好的新的含氟二苯醚类除草剂,今后一方面在剂型开发 上我们可以考虑其它更安全、更有效、更环保的剂型,如水分散粒剂、片剂、水悬浮剂等,另一方面我们可以从农药分子本身的结构着手,以含氟二苯醚类活性基团为骨架,向母体分子中引入具有亲水性和亲脂性的醇胺结构,致力于设计合成水油兼溶且除草活性更高的含结构5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸的新型二苯醚衍生物,进而也可为寻找新的含氟二苯醚除草剂的商品化品种做铺垫。
本发明的目的是通过调5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸酯类衍生物的水溶性和脂溶性,使它们能达到一个很好的平衡,减少生物体外的损失,从而提高药物的利用率。新设计合成的5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸酯类衍生物有两个相同的结构特点:它们有一个亲酯性的部分(油溶性部分)和一个在生理PH条件下质子化形式存在的一级,二级,或三级氨基团(水溶性部分)。这样的水溶-油溶的平衡是药物有效穿过生物膜所必须【Susan Milosovich,et al.J.Pharm.Sci.,82,227(1993)】。带有正电荷的氨基大大增加了药物的溶解度。这点可以从实验操作中可以看到:在产品后处理中,未成正离子的化合物溶于石油醚而不溶于水,变成季胺盐后,化合物存在于水层,而不溶于石油醚。在多数情况下,药物的溶解度是吸收过程中最慢和限制速度的步骤。当这些新型化合物做成药剂时,它分子中氨基会与细胞膜的磷酸盐端基键合。因此,药物在生物膜外侧的局部浓度很高从而有助于这些药物通过高浓度区域到低浓度的区域。当这些药物分子进入到生物膜以后,亲水性部分会推动药物进入到半液态的浓缩水溶液的细胞质。
发明内容:
本发明的目的是提供一类结构新颖的5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸酯类衍生物及其盐的化合物及合成方法,该类化合物具有优异的除草活性。
本发明提供了一种结构新颖的5-[2-氯-4-(三氟甲基)]-苯氧基-2-硝基苯甲酸酯类及其盐的化合物,如通式(I,II)所示:
其中:
n=0,1,2,3,4,5…或(CH2)n代表带有支链的烷基;Y代表Cl-,Br-,F-,I-,AcO-,乙酰水杨酸根,柠檬酸根,水杨酸根,对甲苯磺酸根,硫酸氢根,或其他负离子。R1代表1-6个碳原子的烷基、1-6个碳原子的烷氧基、1-6个碳原子的烯基、或者芳基;R2代表1-6个 碳原子的烷基、1-6个碳原子的烷氧基、1-6个碳原子的烯基、或者芳基;或R1、R2选自如下结构:
本发明较为优选的化合物为:
n=1~4,Y为酸根离子,R1,R2选自H,C1-C4烷基或R1=R2选自如下结构:
本发明的通式化合物(I,II)如下方法制备:
将中间体酸(A)与SOCl2,PCl3或草酰氯溶于适宜的溶剂,例如二氧六环,苯,甲苯,乙酸乙酯,THF,正己烷,四氯化碳,氯仿或二氯甲烷,以有机碱如吡啶,三乙胺,以DMF为催化剂,温度为0℃到沸点下反应1-24小时制得酰氯(B)。
酰氯(B)与(n+1)-(二烷基)氨基-1-醇(制备得到),在适宜的溶剂中,温度为0℃到沸点下反应1-24小时制得产物(I)。溶剂可为二氧六环,苯,甲苯,乙酸乙酯,THF,丙酮,正己烷,四氯化碳,氯仿或二氯甲烷等。加入碱性物质,如吡啶,三乙胺,氢氧化钠,氢氧化钾,碳酸钠,碳酸氢钠,碳酸钾或碳酸氢钾等对反应有利。
产物(I)与稀酸YH,可以将产物(I)溶于适宜的溶剂中,加入稀酸YH,温度为0℃到沸点下反应1-24小时制得产物(II)。溶剂可为二氧六环,苯,甲苯,乙酸乙酯,THF,丙酮,正己烷,四氯化碳,氯仿或二氯甲烷等。
表1:部分如通式I所示的本发明化合物
本发明的通式(I,II)化合物具有除草活性,在苗前或苗后使用可以很好地控制杂草的生长。同现有同类化合物相比,该类化合物表现出更好的除草活性和广谱性。
本发明还包括以通式(I,II)化合物为活性组分的除草组合物。该除草组分中活性组分的重量百分含量为1-99%。该除草组合物中还包括农业上可接受的载体。
本发明的通式(I,II)化合物及其做为活性组分的除草组合物可以制成多种制剂使用,尤其是通式(II),可以直接配成水剂使用,既减少了使用有机溶剂对环境的污染,又更利于植物的吸收和传导。在这些组合物中,也可以加入液体或固体载体,并加入适量的表面活性剂来配合施用。
本发明其它的实施方案为防治杂草的方法,该方法包含将本发明的化合物及其组合物施用于所述杂草或其生长介质的表面上。施用量一般为每公顷75克到500克,优选有效量为每公顷50克到300克。另外,也可以在本发明的化合物中及其活性组合物中加入一种或多种其它的除草剂,由此可以产生更高效,广谱的效果。
本发明的通式(I,II)化合物作为除草剂既可以单独使用也可以配合其它记知的杀菌剂、杀虫剂、植物生长调节剂或肥料一起混合使用。
应明确的是在本发明权利要求范围内,可根据需要进行各种改动和变换。
具体实施方式
下列实施例和生测试验结果可进一步用来说明本发明的除草活性,但不意味着限制本发 明。
合成实例
化合物1:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二甲基)]乙酯的合成
在装有恒压滴液漏斗和干燥管的100ml四口圆底烧瓶中加入7.24g(0.02mol)5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸和30ml二氯甲烷,搅拌使其完全溶解,然后在冰浴下缓慢滴加3.05g草酰氯和20ml二氯甲烷的混合液,加完后室温搅拌6h,反应液变为黄色的澄清液,TLC检测基本反应完全,脱溶得黄色5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酰氯。
往上述已制备好的5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酰氯(0.02mol)的100ml的圆底烧瓶中加入50ml二氯甲烷,然后在冰浴下缓慢滴加1.78g N,N-二甲基乙醇胺、3ml三乙胺和20ml二氯甲烷的混合液,滴完后改为室温搅拌6h,TLC检测已基本反应完全,停止反应,把反应液转移到250ml的烧杯中用饱和的NaHCO3水溶液中和至PH=7~8,分液,用饱和的NaCl水溶液(3×30mL)洗涤,有机相无水硫酸钠干燥4h,减压脱溶得红黑色粗品,残余物经柱层析[V石油醚/V乙酸乙酯=6/1,加少许三乙胺分离得到淡黄色固体化合物1。收率56.7%。mp 67~68℃;1H NMR(400MHz,CDCl3)d:2.29(s,6H,2CH 3),2.66(t,2H,JH=5.6Hz,CH 2N),4.44(t,2H,JH=5.6Hz,OCH 2CH2N),7.06(dd,1H,JH=2.4Hz,JH=9.2Hz,ArH),7.12(d,1H,JH=2.8Hz,ArH),7.26(s,1H,ArH),7.62(d,1H,JH=8.4Hz,ArH),7.81(s,1H,ArH),8.05(d,1H,JH=8.8Hz,ArH);HRMS:calc for C18H16F3N2O5Cl;(M+H)+433.0773;found 433.0775。
化合物1:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二乙基)]乙酯的合成
合成方法同化合物1,得红黑色液体化合物2,收率52.1%。1H NMR(400MHz,CDCl3)d:1.02(t,6H,JH=7.2Hz,2CH 3),2.58(q,4H,JH=7.2Hz,2CH 2),2.79(t,2H,JH=6.4Hz,CH 2N),4.41(t,2H,JH=6.4Hz,OCH 2CH2N),7.10(dd,1H,JH=2.8Hz,JH=8.8Hz,ArH),7.13(d,1H,JH=2.4Hz,ArH),7.28(s,1H,ArH),7.63(dd,1H,JH=2.4Hz,JH=8.4Hz,ArH),7.83(d,1H,JH=2.0Hz,ArH),8.05(d,1H,JH=8.8Hz,ArH);HRMS:calc for C20H20F3N2O5Cl;(M+H)+461.1086;found 461.1080。
化合物3:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二异丙基)]乙酯的合成
合成方法同化合物1,得桔黄液体化合物3,收率59.3%。1H NMR(400MHz,CDCl3)d:1.00(d,12H,JH=6.8Hz,4CH 3),2.74(t,2H,JH=7.2Hz,CH 2N),2.97-3.03(q,2H,2CH),4.24(t,2H,JH=7.2Hz,OCH 2CH2N),7.09(dd,1H,JH=2.8Hz,JH=8.8Hz,ArH),7.13(d,1H,JH=2.4Hz,ArH),7.26(d,1H,JH=2.0Hz,ArH),7.61(dd,1H,JH=1.6Hz,JH=8.4Hz,ArH),7.81(s,1H,ArH),8.03(d,1H,JH=8.8Hz,ArH);HRMS:calc for C22H24F3N2O5Cl;(M+H)+489.1399;found4891392。
化合物6:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸吗啉乙醇酯的合成
合成方法同化合物1,得黄色固体化合物6,收率49.3%。mp 89~91℃;1H NMR(400MHz,CDCl3)d:2.50(t,4H,JH=4.4Hz,2N-CH 2),2.71(t,2H,JH=5.6Hz,CH 2N),3.69(t,4H,JH=4.4Hz,2CH 2O),4.45(t,2H,JH=5.6Hz,OCH 2CH2N),7.07(dd,1H,JH=2.8Hz,JH=9.2Hz,ArH),7.13(d,1H,JH=2.8Hz,ArH),7.27(s,1H,ArH),7.62(d,1H,JH=8.4Hz,ArH),7.82(s,1H,ArH),8.04(d,1H,JH=9.2Hz,ArH);HRMS:calc for C20H18F3N2O6Cl;(M+H)+475.0878;found475.0880。
化合物15:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酰(2-N,N-二甲基)乙胺的合成
合成方法同化合物1,得棕黄色固体化合物15,收率50.3%。mp 108~110℃;1H NMR(400MHz,CDCl3)d:2.25(s,6H,2CH 3),2.54(t,2H,JH=5.6Hz,H 2N),3.53(q,2H,JH=5.6Hz,JH=11.6Hz,NHCH 2CH2N),6.46(br,1H,NH),7.00-7.03(m,2H,2ArH),7.27(d,1H,JH=8.8Hz,ArH),7.63(dd,1H,JH=1.6Hz,JH=8.4Hz,ArH),7.83(d,1H,JH=1.6Hz,ArH),8.16(dd,1H,JH=2.0Hz,JH=7.2Hz,ArH);HRMS:calc for C18H17F3N2O4Cl;(M+H)+432.0933;found 432.0930。
化合物1-H:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二甲基)]乙酯盐酸盐的合成
在四口圆底烧瓶中加入0.433g(0.001mol)5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二甲基)]乙酯和10ml二氯甲烷,然后缓缓的通入干燥的HCl气体,通过控制浓硫酸的滴加速度来平稳的产生HCl气流,连续通入0.5h,便可完全反应,停止通HCl气体,减压条件下把溶剂旋干,得4.65g棕黄色固体化合物1-H,收率99%,mp 27~29℃。1H NMR(400MHz,CDCl3)d:2.89(s,6H,2CH 3),3.48(br,2H,CH 2N),4.93(br,2H,OCH 2CH2N),7.13(d,1H,JH=8.8Hz,ArH),7.21(s,1H,ArH),7.34(d,1H,JH=8.0Hz,ArH),7.67(d,1H,JH=8.0Hz,ArH),7.84(s,1H,ArH),8.12(d,1H,JH=8.8Hz,ArH),13.00(br,1H,N-H);HRMS:calc for C18H17F3N2O5Cl2;M+433.0772;found 433.0770。
化合物2-H:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二乙基)]乙酯盐酸盐的合成
合成方法同化合物1-H,得黄色固体化合物2-H,收率99.2%。mp 23~25℃。1H NMR(400MHz,CDCl3)d:1.42(t,6H,JH=6.0Hz,2CH 3),3.19(br,4H,2CH 2),3.44(s,2H,CH 2N),4.93(s,2H,OCH 2CH2N),7.12(d,1H,JH=8.8Hz,ArH),7.19(s,1H,ArH),7.33(d,1H,JH=8.0Hz,ArH),7.66(d,1H,JH=8.4Hz,ArH),7.82(s,1H,ArH),8.09(d,1H,JH=8.0Hz,ArH),12.50(br,1H,N-H);HRMS:calc for C20H21F3N2O5Cl2;M+461.1080;found 461.1078。
化合物3-H:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸[2-(N,N-二异丙基)]乙酯盐酸盐的合成
合成方法同化合物1-H,得蓬松状黄色固体化合物3-H,收率99.5%。mp 71~75℃。1H NMR(400MHz,CDCl3)d:1.48(d,6H,JH=4.8Hz,2CH 3),1.56(d,6H,JH=4.8Hz,2CH 3),3.33(s,2H,CH 2N),3.68(br,2H,2CH),4.96(s,2H,OCH 2CH2N),7.11(d,1H,JH=8.8Hz,ArH),7.27(s,1H, ArH),7.34(d,1H,JH=8.0Hz,ArH),7.66(d,1H,JH=8.0Hz,ArH),7.82(s,1H,ArH),8.10(d,1H,JH=8.8Hz,ArH),11.86(br,1H,N-H);HRMS:calc for C22H25F3N2O5Cl2;M+489.1399;found 489.1398。
化合物6-H:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酸吗啉乙醇酯盐酸盐的合成
合成方法同化合物1-H,得蓬松状黄色固体化合物6-H,收率99.4%。mp 68~73℃。1H NMR(400MHz,CDCl3)d:3.02(t,2H,JH=9.6Hz,N-CH 2),3.46(s,2H,N-CH 2),3.51(d,2H,JH=12.0Hz,CH 2N),3.99(d,4H,JH=12.8Hz,CH 2O),4.28(t,2H,JH=12.4Hz,CH 2O),5.02(s,2H,OCH 2CH2N),7.14(d,1H,JH=9.2Hz,ArH),7.18(s,1H,ArH),7.27(s,1H,ArH),7.33(d,1H,JH=8.4Hz,ArH),7.67(d,1H,JH=8.0Hz,ArH),7.85(s,1H,ArH),8.11(d,1H,JH=8.8Hz,ArH),13.52(br,1H,N-H);HRMS:calc for C20H19F3N2O6Cl2;M+475.0880;found 475.0881。
化合物15-H:5-[2-氯-4-(三氟甲基)-苯氧基]-2-硝基苯甲酰(2-N,N-二甲基)乙胺盐酸盐的合成
合成方法同化合物1-H,得蓬松状黄色固体化合物15-H,收率99.5%。mp 84~89℃。1H NMR(400MHz,CDCl3)d:2.97(s,6H,2CH 3),3.41(s,2H,CH 2N),3.85(s,2H,NHCH 2CH2N),7.04(s,2H,2ArH),7.32(d,1H,JH=8.4Hz,ArH),7.63(d,1H,JH=7.6Hz,ArH),7.82(s,1H,ArH),8.20(d,1H,JH=9.2Hz,ArH),8.88(br,1H,NHCH2CH2N),11.67(br,1H,N-H);HRMS:calc for C18H18F3N2O4Cl2;M+432.0935;found 432.0937。
生测实例
采用对作用机制敏感的盆栽法中的茎叶处理对以上目标化合物分别进行了初步活性测试。
盆栽法(茎叶处理):在直径8cm的塑料小杯中放入一定量的土,加入一定量的水,播种后覆盖一定厚度的土壤,于花房中培养,幼苗出土前以塑料膜覆盖。出苗后,每天加以定量的清水以保持正常生长。当幼苗长到一定时期进行茎叶喷雾处理。处理27天后调查结果,测定地上部鲜重,以鲜重抑制百分数来表示药效。由于杂草焚衍生物主要抑制阔叶杂草的生长,所以盆栽实验中选用油菜(Brassica campestris)和苋菜(Amaranthus retroflexus L.)代表双子叶阔叶杂草作为测试对象,且本专利申请中的新制备的衍生物药剂的配制方法都是通过直接加水而制成的。
部分化合物除草结果
Claims (5)
3.权利要求1所述的化合物或其组合物用于控制一年生和多年生草本杂草及木本杂草的用途。
4.一种除草混合物,含有如权利要求1所述的化合物和农业上可接受的载体,组合物中活性组分的重量百分含量为1-99%。
5.一种控制杂草的方法,其特征在于:向杂草或杂草的生长介质或地点上施用除草有效量的如权利要求4所述的除草混合物。
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| JPS57106654A (en) * | 1980-12-22 | 1982-07-02 | Ishihara Sangyo Kaisha Ltd | Phenyl ether type compound and herbicide comprising it |
| EP0066989A2 (en) * | 1981-06-01 | 1982-12-15 | Rohm And Haas Company | Novel substituted nitrodiphenyl ethers, herbicidal compositions containing them, a process for the preparation of the nitrodiphenyl ethers and the use thereof for combating weeds |
| US4455437A (en) * | 1979-01-09 | 1984-06-19 | Ciba-Geigy Corporation | Aminoalkyl esters of 2-nitro-5-(o-chloro-p-trifluoromethylphenoxy)-benzoic acid |
| CN101747202A (zh) * | 2008-12-11 | 2010-06-23 | 中国中化集团公司 | 2-氯苯甲酸酯类化合物及其应用 |
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| US4455437A (en) * | 1979-01-09 | 1984-06-19 | Ciba-Geigy Corporation | Aminoalkyl esters of 2-nitro-5-(o-chloro-p-trifluoromethylphenoxy)-benzoic acid |
| JPS57106654A (en) * | 1980-12-22 | 1982-07-02 | Ishihara Sangyo Kaisha Ltd | Phenyl ether type compound and herbicide comprising it |
| EP0066989A2 (en) * | 1981-06-01 | 1982-12-15 | Rohm And Haas Company | Novel substituted nitrodiphenyl ethers, herbicidal compositions containing them, a process for the preparation of the nitrodiphenyl ethers and the use thereof for combating weeds |
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