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1.
1-芳酰基-4-芳基氨基脲类化合物的合成及表征   总被引:8,自引:0,他引:8  
利用N-取代三氯乙酰胺与芳基酰肼反应,合成了6个新的1-芳酰基-4-芳基 氨基脲类化合物,其结构经IR,^1H NMR和元素分析证实。初步生物活性测试表明 ,具有一定的除草活性。  相似文献   

2.
用1-芳基-1,4-二氢-6-甲基-4-氧哒嗪-3-酰肼与取代苯基异硫氰酸酯反应合成了系列新型取代-1,4-二氢-6-甲基-4-哒嗪酮-3-酰氨基硫脲化合物,其结构经IR,1H NMR及元素分析确认,生物活性测定表明,该类化合物对烟草花叶病毒具有很高的抑制活性。  相似文献   

3.
以3-羟基-2-烷基-4(1H)-吡喃酮为原料与胺反应制备N-取代-4(1H )-吡啶酮,再与亲核试剂发生氧化-迈克尔加成反应,合成了相应的N-取代- 6-芳硫基吡啶酮化合物。生物活性研究结果发现,N-取代-6-芳硫基吡啶酮类 化合物对5-脂氧合酶具有良好的抑制作用。  相似文献   

4.
γ-[N_1-取代-1,4,5,6-四氢(及1,6-二氢)-6-氧-3-哒嗪酰胺基]丁酸乙酯类化合物的合成许凤荣,王书玉,徐萍,黎辉,胡长风,欧阳荔(北京医科大学药学院、分析计算中心波谱室,北京,100083)关键词6-氧-3-哒嗪酸,哒嗪类衍生物,...  相似文献   

5.
以2-氨基对苯二甲酸(1)为起始原料,与乙酸酐缩合生成7-羧基乙酰苯邻 甲内酰胺(2);2和芳胺缩合产生7-羧基-2-甲基-3-芳基-4(3H)-喹唑啉 酮(3);3和N,N-双环己基碳双亚胺(DCC)加成得到中间体4,4在4-二甲氨基 吡啶(DMAP)催化下和5,5-二甲基-1,3-环己二酮(5)缩合得到目标产物2- 甲基-3-芳基-7-(5,5-二甲基-3-酮-1-环己烯-1-基)甲酸酯-4( 3H)-喹唑啉酮(6)。所得15个新型化合物的结构均经^1H NMR、元素分析确证, 部分化合物经IC/MSD确证。  相似文献   

6.
植物病毒;抑制活性;1-取代苯基-1;4-二氢-6-甲基-4-哒嗪酮-3-酰肼的合成及其抗烟草花叶病毒活性  相似文献   

7.
合成了一系列的1-芳基-1,4-二氢-3-芳酰肼基甲酰基-各甲基斗哒嗪酮类化合 物,并用离体黄瓜子叶生根法测试其生物活性,生测结果表明,所有的化合物均显 示出一定的生物活性,并且芳环上的取代基对活性有重要影响.采用化合物的物理 化学参数及化合物促进黄瓜子叶生根的活性,进行了结构与活性定量关系研究,建 立了较好的结构与活性的相关式,化合物的亲脂性和取代基的电性对化合物的生物 活性具有重要的影响.研究结果对3-芳酰肼基甲酰基斗哒嗪酮类化合物的改性或新 类似物的合成具有指导意义.  相似文献   

8.
报道了4-(2'-羟基苯甲酰肼)苯亚甲基-5-甲基-2-苯基-2,4-二氢-吡 唑啉酮-3(B_1)和4-(2'-羟基苯甲酰肼)亚乙基-5-甲基-2-苯基-2,4-二 氢-吡唑啉酮-3(B_2)的合成、表征及晶体结构分析,B_1晶体属单斜晶系, C2/c空间群,所得晶胞参数为:a = 1.4201(2) nm, b = 1.65542(2) nm, c = 1. 8455(3) nm, β = 101.32(1)°,V = 4.2541(10) nm~3, Z = 8, D_c = 1.344 g/cm~3, μ = 0.094 mm~(-1), F(000) = 1808, R = 0.0442, wR = 0.1037。该 化合物由水分子通过氢键连接成沿ac面无限延伸的二维网络结构的超分子。B_2晶 体属三斜晶系,P1空间群,a = 1.2120(2) nm, b = 1.2223 (2) nm, c = 1.4159 (3) nm, α = 70.38 (1)°, β = 74.91 (1)°, γ = 63.64(1)°, V = 1.7549 (5)° nm~3, Z = 4, D_c = 1.326 g/cm~3, μ = 0.092 mm~(-1), F(000) = 736, R = 0.0436, wR = 0.1076。此化合物通过分子间氢键形成沿α轴无限延伸的一维 链状结构的超分子,由于分子间的作用力使其分子又沿b轴呈层状堆积。  相似文献   

9.
报道了4-(2'-羟基苯甲酰肼)苯亚甲基-5-甲基-2-苯基-2,4-二氢-吡 唑啉酮-3(B_1)和4-(2'-羟基苯甲酰肼)亚乙基-5-甲基-2-苯基-2,4-二 氢-吡唑啉酮-3(B_2)的合成、表征及晶体结构分析,B_1晶体属单斜晶系, C2/c空间群,所得晶胞参数为:a = 1.4201(2) nm, b = 1.65542(2) nm, c = 1. 8455(3) nm, β = 101.32(1)°,V = 4.2541(10) nm~3, Z = 8, D_c = 1.344 g/cm~3, μ = 0.094 mm~(-1), F(000) = 1808, R = 0.0442, wR = 0.1037。该 化合物由水分子通过氢键连接成沿ac面无限延伸的二维网络结构的超分子。B_2晶 体属三斜晶系,P1空间群,a = 1.2120(2) nm, b = 1.2223 (2) nm, c = 1.4159 (3) nm, α = 70.38 (1)°, β = 74.91 (1)°, γ = 63.64(1)°, V = 1.7549 (5)° nm~3, Z = 4, D_c = 1.326 g/cm~3, μ = 0.092 mm~(-1), F(000) = 736, R = 0.0436, wR = 0.1076。此化合物通过分子间氢键形成沿α轴无限延伸的一维 链状结构的超分子,由于分子间的作用力使其分子又沿b轴呈层状堆积。  相似文献   

10.
研究了以2-氨基苯甲酰肼和4-氧代庚二酸为原料,以离子液体为绿色溶剂,在碘催化下进行的反应.结果显示,当酰肼中与酰胺基相连上的N原子没有取代基时,会顺利构建三个新环生成哒嗪并[6,1-b]吡咯并[1,2-a]喹唑啉-1,6,9(7H)-酮衍生物,并通过X单晶衍射分析验证了产物2,3,4,5-四氢化-1H,9H-哒嗪并[6,1-b]吡咯并[1,2-a]喹唑啉1,6,9(7H)-三酮(3a)的结构.而当其取代基是芳基时,由于位阻效应,哒嗪环并没有如期关环,生成四氢吡咯并[1,2-a]喹唑啉-3a(1H)-丙酸衍生物.该方法具有合成路线简洁、溶剂绿色环保、操作简便且收率较高等优点.  相似文献   

11.
Phase and structural relationships of the sulfur, selenium, and tellurium compounds of the 4d and 5d transition elements of groups IV to VII of the periodic system are discussed. Homologous elements behave very similarly with respect to the chalcogens, and this is particularly the case for niobium and tantalum, and for molybdenum and tungsten. However, zirconium, niobium, and molybdenum have a greater tendency towards formation of chalcogen-poor phases than their homologues hafnium, tantalum, and tungsten. Subchalcogenides are known only for zirconium and niobium. The number of phases and the tendency towards formation of solid solutions are considerably smaller among the tellurides than among the sulfides and selenides. The crystal structures of the telluride phases also differ from those of the sulfide and selenide phases of analogous composition. In addition, a review of the phase and structural relationships of the arsenic and antimony compounds of the 4d and 5d transition elements of groups V to VII is given.  相似文献   

12.
常温常压下吡咯及其衍生物的镍催化加氢反应考察   总被引:2,自引:0,他引:2  
为进一步研究常温常压下吡咯及其衍生物的镍催化加氢反应,我们对试剂吡咯、吡咯烷和吡咯烷酮做了相应的催化加氢实验。并采用电镜(TEM-HREM)、X射线衍射(XRD)对Ni基催化剂的形貌、结构、加氢活性和超声波对其影响进行了检测,同时还用紫外吸收光谱、气相色谱等对加氢产物进行了分析考察。结果表明超声波能促进镍基催化剂活性,使镍微晶(111)晶面间距增大1.5%、并保持高分散态。常温常压下纳米镍基催化剂对吡咯、吡咯烷和吡咯烷酮的加氢反应显示一定的催化活性;吡咯加氢首先生成吡咯烷,进而使环打开生成低碳烃、氨等产物,总反应为零级,符合表面接触反应特征。  相似文献   

13.
We review the syntheses, optical properties, and biological applications of cadmium selenide (CdSe) and cadmium selenide–zinc sulfide (CdSe–ZnS) quantum dots (QDs) and gold (Au) and silver (Ag) nanoparticles (NPs). Specifically, we selected the syntheses of QDs and Au and Ag NPs in aqueous and organic phases, size- and shape-dependent photoluminescence (PL) of QDs and plasmon of metal NPs, and their bioimaging applications. The PL properties of QDs are discussed with reference to their band gap structure and various electronic transitions, relations of PL and photoactivated PL with surface defects, and blinking of single QDs. Optical properties of Ag and Au NPs are discussed with reference to their size- and shape-dependent surface plasmon bands, electron dynamics and relaxation, and surface-enhanced Raman scattering (SERS). The bioimaging applications are discussed with reference to in vitro and in vivo imaging of live cells, and in vivo imaging of cancers, tumor vasculature, and lymph nodes. Other aspects of the review are in vivo deep tissue imaging, multiphoton excitation, NIR fluorescence and SERS imaging, and toxic effects of NPs and their clearance from the body. Figure Semiconductor quantum dots and metal nanoparticles have extensive applications, e.g., in vitro and in vivo bioimaging Tamitake Itoh and Abdulaziz Anas contributed equally to this article.  相似文献   

14.
纳米材料由于其独特的光、电、磁、力学等性质,成为了构建功能材料与器件的理想基元。实现纳米粒子的精确组装,是探究粒子之间的耦合聚集性质和制备宏观功能器件的基础。但是由于纳米粒子的小尺寸以及在溶液中运动的随机性与复杂性,精准控制纳米粒子组装体的形貌以及在空间中的相对位置仍存在巨大挑战。为了将纳米粒子组装成理想的有序结构,许多控制粒子组装的策略与方法得到发展。本文首先概述了纳米粒子自组装的控制方法与典型形貌,着重分析了影响粒子精准排布的因素与控制方法,并对纳米粒子及其组装体的光学性质与器件应用的最新研究进展进行了讨论,最后对目前纳米粒子精准组装所面临的挑战以及未来发展的方向进行了展望。  相似文献   

15.
基于偶极近似,运用电极化方法,定量研究了电流变液中悬浮颗粒在外电场作用下其体积和形状的变化,并计算了其体积和形状的相对变化率.研究结果表明:悬浮颗粒的体积和形状的相对变化率均与电场强度的平方成正比,并与ER本身的性质有关.一般情况下,颗粒的体积和形状的相对变化率分别为8.4%和12.5%,对总体积变化率的贡献为1.68%.这种变化对于ER系统的电涨和电热都作出了贡献,仅当将颗粒当作刚性球时,其自由能才与电场强度的平方成正比.  相似文献   

16.
Thermal analysis methods are well-established techniques in research laboratories of pharmaceutical industry. The robustness and sensitivity of instrumentation, the introduction of automation and of reliable software according to the industrial needs widened considerably the areas of applications in the last decade. Calibration of instruments and validation of results follow the state of the art of cGMP as for other analytical techniques. Thermal analysis techniques are especially useful for the study of the behavior of the poly-phasic systems drug substances and excipients and find a unique place for new delivery systems. Since change of temperature and moisture occur by processing and storage, changes of the solid state may have a considerable effect on activity, toxicity and stability of compounds. Current requirements of the International Conference of Harmonisation for the characterization and the quantitation of polymorphism in new entities re-enforce the position of thermal analysis techniques. This challenging task needs the use of complementary methods. Combined techniques and microcalorimetry demonstrate their advantages. This article reviews the current use of thermal analysis and combined techniques in research and development and in production. The advantage of commercially coupled techniques to thermogravimetry is emphasized with some examples. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

17.
L—赖氨酸锌细胞生物学和生物学实验研究   总被引:6,自引:3,他引:3  
研究了L-赖氨酸锌对健康大鼠血液及骨髓中细胞的影响,并与对照组进行了比较。结果表明,本品对健康鼠血液中红细胞,血小板,淋巴细胞、中性白细胞和单核细胞及骨髓多染红细胞中的微核数等均无显著性影响,另外大鼠伤寒沙门氏菌的致突变实验显示L-赖氨酸锌未引起大鼠伤寒沙门氏组氨酸缺陷型变异菌株的回复突变,而健康小儿血液各项生化指标的变化,揭示本品可显示提高血液中碱性磷酸酶和红细胞水平,对白细胞的增殖有促进作用,但对乳酸脱氢酶、谷丙转氨酶等无显著性影响。  相似文献   

18.
Unsaturated polyester resin (UPR)/acrylate-terminated polyurethane (ATPU)/organo-modified montmorillonite (OMMT) nanocomposites were prepared by the in situ intercalative polymerization method. Samples were prepared by the sequential mixing, i.e. mixture of the ATPU and styrene (S) and OMMT were prepared in the first step; UPR was then added to the pre-intercalates of ATPU/S/OMMT. Results indicate that the mechanical properties and thermal properties of UPR/ATPU/OMMT nanocomposites greatly depend on the amount of ATPU and OMMT. Results show that the addition of ATPU could increase the impact strength of UPR/ATPU composites, but the tensile strength, flexural strength and heat resistance of the materials are obviously decreased. When the weight ratio between UPR, ATPU and OMMT were 82:15:3, the impact strength and heat distortion-temperature of nanocomposite were greatly improved, meanwhile there was little change for other properties of the nanocomposites. The synergistic enhancement effects of ATPU and OMMT on the composites were observed. The structures and morphology of the composites were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy.  相似文献   

19.
多弧离子镀TiN与不同金属基材间的接触界面与表面特性   总被引:1,自引:0,他引:1  
用多弧离子镀技术在不同金属基材上进行TiN镀膜实验,制备了TiN/Fe、 TiN/Cu和TiN/Cr/Cu复合膜.借助扫描电子显微镜(SEM)、 X射线衍射仪(XRD)和光电子能谱(XPS),研究了TiN与Fe、 Cu和Cr/Cu三种不同衬底接触界面的形貌、结构及其表面特性.SEM观察发现,在一定离子镀膜条件下, TiN涂层可与Fe、 Cu和Cr/Cu金属基材形成均匀平整的接触界面,在铜基上TiN界面清晰,在Fe与Cr/Cu界面有明显的层状晶界微结晶分布.XRD分析显示, Fe、 Cu和Cr/Cu表面生成的薄膜都包含TiN、 Ti2N等多晶相,在Cr/Cu界面还包含Ti-Cr的金属间化合物.XPS结果表明,表面除了TiN膜外,还生成TiO2和TiOxNy等氧化膜.Ar+刻蚀5 min后, TiO2消失, TiOxNy减少, TiN则呈增加趋势.TiN与Cr/Cu界面形成明显的Ti-Cr和Cr-Ni互扩散层,这有助于增强薄膜附着力,形成较牢固的TiN涂层.  相似文献   

20.
赵燕青  许文辉  贾琼 《色谱》2022,40(10):862-871
蛋白质的磷酸化和糖基化作为研究最广泛的两种翻译后修饰(PTMs),在疾病的早期无创诊断、预后和治疗评估中表现出越来越大的潜力。蛋白质的异常磷酸化和糖基化经常被用于临床蛋白质组学研究和疾病相关生物标志物的发现。目前已有多种材料被开发用于磷酸化肽和糖肽的富集研究,其中,智能响应材料由于具有独特的响应特性,已被陆续报道用于磷酸化肽和糖肽的富集。智能响应材料可对外界刺激做出响应,发生结构和性质上的变化,将光、电、热、机械等信号转化为生物化学信号。响应分子是决定智能响应材料响应特性的先决条件,它们在不同刺激条件下(如温度、pH、光、机械应力、电磁场等)的可逆异构化将导致材料的宏观物理和化学性质的动态变化。与传统材料相比,智能响应材料可以可逆地“打开”和“关闭”,具有更好的可调控性。由于引起智能材料响应的刺激信号对其性能具有重要的影响,综述根据施加的刺激种类对智能响应材料进行分类,具体分为外源性响应材料和内源性响应材料,且分别总结了外源性响应材料、内源性响应材料以及内外源共同响应材料在磷酸化肽和糖肽富集方面的工作。此外,综述对智能响应材料在磷酸化肽和糖肽富集方面的发展前景进行了展望,并且提出了智能响应材料在其他蛋白质翻译后修饰方面的应用中存在的挑战。  相似文献   

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