新型含1,3,4-噁二唑环结构的氰基丙烯酸酯类化合物的合成及生物活性研究

为了从氰基丙烯酸酯类化合物中寻找新的活性化合物,通过活性亚结构拼接方法,设计并合成了一系列未见文献报道的新型含1,3,4-噁二唑环的氰基丙烯酸酯类化合物.采用核磁共振氢谱、碳谱和元素分析确认了目标化合物的结构.初步的生物活性测试结果显示,在1500 g/ha剂量下,化合物8b对繁缕的茎叶处理抑制率为80%.化合物8j对小藜的茎叶处理抑制率为70%.另外,化合物8e,8k,8m和8n对人肝癌细胞株表现出较好的抗肿瘤作用,其IC50值分别为8.2,5.9,8.0和12.6μmol/L.     

新型含噁唑环结构的氰基丙烯酸酯类衍生物的合成及其生物活性研究

为了从氰基丙烯酸酯类衍生物中寻找新的活性化合物,通过活性基团拼接方法,设计合成了一系列新型含噁唑环结构的氰基丙烯酸酯化合物.初步的除草活性测试结果表明,大部分标题化合物具有较好的除草活性.在剂量为750g/ha时,部分化合物对芥菜的除草活性可达80%~100%,对小藜的抑制率可达90%~100%,对酸模的除草活性可达80%~100%.2-氰基-3-甲硫基-3-{[4-(2-(4-氟苯基)噁唑-4-基)甲硫基]-苯甲基胺基}丙烯酸(2-甲氧基)乙酯(11a)和2-氰基-3-甲硫基-3-{[4-(2-(3,4-二氟苯基)噁唑-4-基)甲硫基]-苯甲基胺基}丙烯酸(2-甲氧基)乙酯(11e)对看麦娘的除草活性分别为70%和60%,对棒头草的抑制率分别为70%和60%.化合物11a对早熟禾的抑制率为70%.此外,化合物11a在150g/ha剂量下对芥菜和酸模的抑制率均达40%.     

1,2,4-噁二唑类化合物的合成及抗菌活性研究

以对溴苯腈为原料,通过多步反应合成了一系列3-(吗啉苯基)-5-取代-1,2,4-异噁唑类化合物和3-(吗啉苯基)-5-取代-4,5-二氢-1,2,4-噁二唑类化合物,并用1HNMR、13C NMR和MS进行了结构确证。这些化合物对测试的部分革兰氏阳性菌,如金黄色葡萄球菌、耐甲氧西林金黄色葡萄球菌、表皮葡萄球菌、粪肠球菌显示出一定的抗菌活性,但与噁唑烷酮类上市药物利奈唑胺相比,抗菌活性有明显下降。这一结果表明对于化合物的抗菌活性,1,2,4-噁二唑杂环不如噁唑烷酮结构有效。     

新型含取代嘧啶结构的氰基丙烯酸酯类化合物的合成与除草活性研究

为了从氰基丙烯酸酯类衍生物中寻找新的活性化合物,通过活性亚结构拼接方法,设计并合成了一系列未见文献报道的新型含取代嘧啶结构的氰基丙烯酸酯类化合物.其结构均经核磁共振氢谱、碳谱和元素分析确证.初步的生物活性测试结果表明,部分目标化合物显示出较好的除草活性.在1500 g/ha剂量下,化合物9a和9b对芥菜的茎叶处理除草活性分别为90%和100%,化合物9a和9b对繁缕的茎叶处理除草活性分别为90%和100%,化合物9a和9b对小藜的茎叶处理除草效果分别为95%和100%;此外,化合物9b在750 g/ha剂量下对芥菜、繁缕及小藜茎叶处理抑制率均达100%,化合物9b在375 g/ha剂量下对芥菜、繁缕及小藜茎叶处理抑制率分别为90%,80%和90%.     

含吡啶甲基苯基醚结构的氰基丙烯酸酯类化合物的合成及除草活性研究

以氰基丙烯酸酯类化合物为母体结构,利用生物等排原理和活性亚结构拼接的方法设计并合成了2个系列新型含吡啶甲基苯基醚结构的2-氰基丙烯酸酯类化合物2-氰基-3-[4-(2-氯吡啶-5)-甲氧基]苯甲胺基-3-烷(硫)基丙烯酸酯.所有化合物的结构均通过1H NMR、13C NMR、元素分析或者高分辨质谱确证.生物活性测试结果表明,部分化合物显示出较好的除草活性,其中化合物13e和13g,在剂量为375 g/ha时对油菜茎叶处理的抑制率达到100%;当剂量为187.5g/ha时,化合物13e对油菜茎叶处理的抑制率仍然达到100%.构效关系研究发现苯环上取代基的位阻效应和电子效应能够显著地影响该类化合物的除草活性.     

3-(吗啉吡啶基)-5-取代异噁唑类化合物的合成及抗菌活性研究

以6-氯-3-吡啶甲醛为原料, 通过多步反应合成了一系列3-(吗啉吡啶基)-5-取代异噁唑类化合物, 并用IR, 1H NMR, 13C NMR和MS进行了结构确证. 这些化合物均以异噁唑为母核, 具有近似的平面结构, 在异噁唑环的3-位引入吗啉吡啶基, 而在5-位引入酯基、取代氨基、三唑环和噁唑烷酮环. 研究了这些化合物对金黄色葡萄球菌、耐甲氧西林金黄色葡萄球菌、表皮葡萄球菌、粪肠球菌和大肠杆菌的抑制活性, 发现与噁唑烷酮类上市药物利奈唑胺相比, 目标化合物均显示出更低的抗菌活性, 最低抑制浓度(MIC)大于32 mg/L, 这些试验结果表明异噁唑母核的5-位缺乏sp3杂化结构, 可能会导致抗菌活性的显著降低.     

含1-[4-二(4-氟苯)甲基]哌嗪基团的异噁唑的设计合成及抗肿瘤活性研究

以1-[二(4-氟苯)甲基]哌嗪、溴丙炔及氯代肟为原料以21%~76%的收率制得了12个含有1-[4-二(4-氟苯)甲基哌嗪单元的异噁唑衍生物5a~5l.合成的12个目标化合物通过熔点测定和质谱、红外光谱、元素分析及核磁共振氢谱和碳谱分析对其结构进行确证.经体外抗肿瘤活性测试表明,在20μg/m L的浓度下,有10个化合物对细胞周期分裂蛋白25B(CDC25B)具有较好的抑制活性,其抑制率为64.15%~97.96%,IC_(50)为35.62~13.67μg/m L.在40μmol/L的浓度下,其中四个化合物对白血病HL-60细胞的IC_(50)为36.51~15.25μg/m L,2-(2-氟苯基)-5-(1-(二(4-氟苯)甲基)哌嗪)甲基异噁唑(5g),2-(2-氟苯基)-5-(1-(二(4-氟苯)甲基)哌嗪)甲基异噁唑(5h)对肺癌A-549肿瘤细胞的IC_(50)分别为21.09和35.36μg/m L.     

8-氮杂双环[3.2.1]辛烷-3-异噁唑肟类衍生物的合成及其杀线虫活性

基于具有潜在杀线虫活性的托烷衍生物结构,通过1,3-偶极环加成反应,设计合成了19个未见报道的8-氮杂双环[3.2.1]辛烷-3-异噁唑肟类衍生物,通过~1H NMR,~(13)C NMR和高分辨质谱对目标化合物的结构进行表征.初步的生物活性测试表明:在浓度25 mg/L下,目标化合物对南方根结线虫表现出良好的抑制活性,活性最好的化合物8-甲基-8-氮杂双环[3.2.1]辛烷-3-酮-O-((3-(4-硝基苯基)-4,5-二氢异噁唑-5-基)甲基)肟(9e)在1 mg/L浓度下对根结线虫的抑制率达55.6%.     

新型含取代异噁唑结构的吡唑酰胺类衍生物的合成及其生物活性研究

为了从吡唑类化合物中寻找具有新的活性物质,利用亚结构拼接原理,设计合成了一系列新型含取代异噁唑结构的吡唑酰胺类衍生物.利用1H NMR、13C NMR和元素分析对标题化合物的结构进行了表征.初步的生物活性测试结果表明,部分目标化合物具有较好的杀虫活性.在测试浓度为500μg/m L时,部分化合物对粘虫的防效为60%~100%,对蚜虫的杀死率分别为50%~100%.另外,部分化合物对Hep G2细胞显示出较好的抗肿瘤活性,其IC50值为14.2~18.9μmol/L.     

新型含异噁唑单元的吡唑酰胺类衍生物的合成及杀虫活性

运用活性亚结构拼接的原理,以杀虫剂氯虫苯甲酰胺为先导结构,引入异噁唑环单元,合成了16个含异噁唑环取代的新型吡唑酰胺化合物,采用¹H NMR、¹³C NMR、元素分析等方法对其目标物的结构进行了表征.初步生物活性测试数据显示,大多数化合物在500μg/m L浓度下对粘虫呈现出100%的杀死率.其中3个化合物在100μg/m L浓度下对粘虫的杀死率达80%～100%,在浓度降至20μg/m L时,3个化合物对粘虫仍表现出40%～50%的杀虫活性.3个化合物在500μg/m L浓度下对蚜虫显示出100%的杀虫效果,在100μg/m L浓度下对蚜虫仍有70%～100%的杀虫活性.另外2个化合物在500μg/m L时对朱砂叶螨的防效为90%～100%.     

Synthesis and Biological Activity of Ethyl 4‐Alkyl‐2‐(2‐(substituted phenoxy)acetamido)thiazole‐5‐carboxylate

A series of novel ethyl 4‐(methyl or trifluoromethyl)‐2‐(2‐(substituted phenoxy)acetamido)thiazole‐5‐carboxylates 7a , 7b , 7c , 7d , 7e and 8f , 8g , 8h , 8i , 8j , 8k , 8l , 8m , 8n , 8o , 8p , 8q , 8r were synthesized, and their structures were confirmed by IR, ¹H‐NMR, MS spectra and elemental analysis. The results of preliminary bioassays show that some of the title compounds exhibit moderate to good herbicidal activities. Compared with the fluorine free compounds 7a , 7b , and 7e , the compounds bearing fluorine 8g , 8j , and 8q showed higher herbicidal activities with 70–100% inhibition against Capsella bursa‐pastoris, Amaranthus restroflexus, and Eclipta prostrata at the dosage of 150 g/ha, which indicated that the trifluoromethyl on the thiazole ring was beneficial for the herbicidal activity. Furthermore, compounds 8f , 8g , 8h , 8i , 8j , 8k , 8l , 8m , 8n , 8o , 8p , 8q , 8r were tested for fungicidal activity against Pseudoperonospora cubensis at 500 µg/mL. Compounds 8f and 8q showed the best fungicidal activity with more than 80% inhibition.     

Synthesis and Biological Activity of 1‐(Substituted phenoxyacetoxy)‐1‐(pyridin‐2‐yl or thien‐2‐yl)methylphosphonates

A series of novel O,O‐dimethyl 1‐(substituted phenoxyacetoxy)‐1‐(pyridin‐2‐yl or thien‐2‐yl)methylphosphonates 6a , 6b , 6c , 6d , 6e , 6f , 6g , 6h , 6i , 6j , 6k , 6l , 6m , 6n and 7a , 7b , 7c , 7d were synthesized. Their structures were confirmed by IR, ¹H NMR, mass spectroscopy, and elemental analyses. The results of preliminary bioassays show that some of the title compounds exhibit moderate to good herbicidal and fungicidal activities. For example, the title compounds 6a , 6c , 6l , 6m , and 7d possess 90–100% inhibition against most of the tested plants at the dosage of 1500 g ai/ha, whereas the title compounds 6b , 6g , 6h and 6n possess 92–100% inhibition against Fusarium oxysporum, Phyricularia grisea, Botrytis cinereapers, Gibberella zeae, Sclerotinia sclerotiorum, and Cercospora beticola at the concentration of 50 mg/L.     

Design,Syntheses and Biological Activities of Novel Sulfonylureas Containing an Oxime Ether Moiety

Since sulfonylurea is one of the most potent acetohydroxyacid synthase(AHAS) inhibitors, a series of novel sulfonylureas containing an oxime ether moiety was designed and synthesized and their chemical structures were determined by means of ¹H nuclear magnetic resonance(NMR), ¹³C NMR and high-resolution mass spectrometry(HRMS). In the herbicidal bioassay, several compounds showed moderate to good herbicidal activities against dicotyledons, but their activities against monocotyledons decreased. The in vitro antifungal activity was tested at a dosage of 50 mg/L. And the results show that compounds 7l, 7m and 7n exhibit promising antifungal activities against six common plant pathogenic fungi. Further investigations on molecular modification are in progress.     

4,5-二氢-1,3,4-噻二唑-5-酮-2-甲氨基取代氰基丙烯酸酯类化合物的 合成及生物活性研究

采用氰基丙烯酸酯与5-甲氧基-1,3,4-噻二唑-2-甲氨在乙醇中加热回流的方法合成了一系列4,5-二氢-1,3,4-噻二唑-5-酮-2-甲氨基取代的氰基丙烯酸酯类化合物. 目标化合物结构均经1H NMR, IR和元素分析确证. 生物活性测试结果表明: 部分化合物对双子叶杂草显示出较好的除草活性及良好的选择性, 化合物6j在1.5 kg/ha的剂量下对油菜的茎叶处理抑制率达到100%; 部分化合物还表现出了一定的杀菌和植物生长调节活性. 构效关系研究发现氰基丙烯酸酯3-位取代基的体积对除草活性影响较大, 3-位为异丙基时活性最高.     

Synthesis, Crystal Structure, and Herbicidal Activities of 2-Cyanoacrylates Containing 1,3,4-Thiadiazole Moieties

Three series of novel 2‐cyanoacrylates 7a – 7f , 9a – 9f , 10a – 10f containing 1,3,4‐thiadiazole ring moieties were synthesized as herbicidal inhibitors of photosystem II (PS II) electron transportation. Their structures were clearly verified by ¹H NMR, ¹³C NMR, elemental analysis (or HRMS analysis) and single‐crystal X‐ray diffraction analysis. Bioassay showed that a suitable group at the 3‐position of acrylates was essential for high herbicidal activity. In particular, compound 7e showed the best herbicidal activities and gave 100% inhibitory activity against rape and amaranth pigweed at a dose of 1.5 kg/ha. Introduction of substituent with higher polarity such as sulfinyl or sulfonyl to the 5‐position of 1,3,4‐thiadiazole decreased herbicidal activities.     

Synthesis and Herbicidal Activity of Novel 4‐Acyl‐2,5‐disubstituted‐3‐hydroxypyrazoles and 4‐Arylcarbonyl‐3‐substitutedisoxazol‐5‐ones

Two series of novel 4‐acyl‐2,5‐disubstituted‐3‐hydroxypyrazoles 3a , 3b , 3c , 3d , 3e , 3f , 3g , 3h and 4‐arylcarbonyl‐3‐substitutedisoxazol‐5‐ones 7a , 7b , 7c , 7d , 7e , 7f , 7g , 7h , 7i were synthesized by the Scotton–Baumann reaction of 2,5‐disubstituted‐2,4‐dihydro‐pyrazol‐3‐ones 1 or 3‐substituted‐4H‐isoxazol‐5‐ones 6 and various acyl chlorides, followed by the Fries rearrangement in the presence of calcium hydroxide and calcium oxide as the catalyst. Their structures were confirmed by IR, ¹H NMR, mass spectroscopy, and elemental analyses. ¹H NMR indicated that compounds 3 existed in enol forms and compounds 7 in keto configurations. The results of preliminary bioassays showed that some of the title compounds 3 and 7 exhibited moderate to good herbicidal activities against Brassica campestris L. at the concentration of 100 mg/L. Isoxazole compounds 7 showed better herbicidal activity against B. campestris L. than pyrazole compounds 3 did at the concentration of 100 mg/L. Moreover, most of the isoxazole compounds displayed higher herbicidal activity against B. campestris L. than Echinochloa crus‐galli. However, these compounds showed weak herbicidal activities at the concentration of 10 mg/L.     

Synthesis and Herbicidal Activity of 3-Acetyl-4-hydroxy-2,1-benzothiazine Derivatives

In order to develop a novel herbicide containing the 2,1-benzothiazine motif, a series of 3-acetyl-4- hydroxy-2,1-benzothiazine derivatives was synthesized. All the target compounds were confirmed by 1H NMR,13C NMR, and high-resolution mass spectrometry(HRMS).In addition,the crystal structure of compoimd T27 was detemiined by single crystal X-ray diflraction. The bioassay results showed that some of the 3-acetyl-4-hydroxy- 2,1-benzothiazine derivatives(T13, T15, T22, and T24) showed good herbicidal activity at a dosage of 100 pg/mL. Among them,compounds T22 and T24 showed promising post-emergent herbicidal activities against Brassica campestris and Amaranthus retroflexus even at a dosage of 375 g/ha(1ha=104 m^2) in the greeiiliouse test. Studies on the structure-activity relationship demonstrated that the type of acetyl group played an important role in the herbicidal activity, and that the introduction of a phenoxyacetyl group at the 3-position of 2,1-beiizothiazine was beneficial in improving the herbicidal activity. The present study also indicated that 3-phenoxyacetyl-4-hydroxy-2,1-benzothiazine could be a potential lead compound for fiirther development of novel 2,1 -benzothiazine-containing herbicides.     

新型4,4-二甲基异噁唑-3-酮衍生物的合成及生物活性研究

以Baylis-Hillman加成物为起始原料,设计并合成了5个结构新颖的4,4-二甲基异唑-3-酮衍生物。所合成的化合物经IR、1HNMR和元素分析确证。生物活性测试结果表明,所合成的目标产物在2000gai/ha的剂量下均具有较好的除草活性。中间体1-(2,4-二氯苯基)-2-溴甲基丙烯酸乙酯具有杀虫活性,在600gai/ha的剂量下对朱砂叶螨防效为100%。     

新型N-(5-烷基-1,3,4-噻二唑-2-基)-1-[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰胺的合成与生物活性

为了寻找新型高效低毒的农药先导化合物, 采用1-[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰氯与2-氨基-5-烷基-1,3,4-噻二唑的缩合反应, 合成了8种未见文献报道的目标化合物, 其结构经IR, 1H NMR和元素分析确证, 部分化合物还经MS的进一步证实. 初步的生物活性测试结果表明, 部分目标化合物在100 mg/L浓度下对双子叶植物(油菜)显示出中等的除草活性和一定程度的杀虫活性(250 mg/L).     

新型N-(5-烷基-1,3,4-噻二唑-2-基)-11[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰胺的合成与生物活性

为了寻找新型高效低毒的农药先导化合物,采用1-[(杂芳基)甲基]-5-甲基-1H-1,2,3-三唑基-4-甲酰氯与2-氨基-5-烷基-1,3,4-噻二唑的缩合反应,合成了8种未见文献报道的目标化合物,其结构经IR,1H NMR和元素分析确证,部分化合物还经MS的进一步证实.初步的生物活性测试结果表明,部分目标化合物在100 mg/L浓度下对双子叶植物(油菜)显示出中等的除草活性和一定程度的杀虫活性(250 mg/L).