氮唑类缓蚀剂的研究进展

综述了二唑类、三唑类、四唑类缓蚀剂的国内外研究进展。三唑衍生物的毒性更低,吸附性能更优,可以合成席夫碱来拓展其在缓蚀领域的应用范围。     

1，2，4-三唑类衍生物的研究进展

三唑类杂环衍生物不仅具有广谱、高效的杀菌活性,而且具有良好的杀虫、除草及植物生长调节活性。综述了1,2,4-三唑类衍生物的生物活性和合成方法,同时指出了该类衍生物具有广阔的开发前景。     

化学合成植物病毒抑制剂研究进展

介绍了近年来植物病毒抑制剂的研究情况,作为植物病毒抑制剂的化合物主要可分为三大类：１）有机酸类,包括有机羧酸和有机磺酸;２）杂环化合物,包括生物碱、三唑衍生物、噻二唑衍生物、咪唑衍生物和三嗪衍生物等;３）脲类和硫脲类化合物。     

一种新型1,2,4-三唑席夫碱衍生物的合成及其抑菌活性的研究

以酰肼和8-羟基喹啉-2-甲醛为原料合成了两种新型的1,2,4-三唑席夫碱衍生物,并利用元素分析、核磁和质谱对其结构进行了表征。初步生物活性研究结果表明,在实验浓度下该系列化合物表现出一定的杀菌活性。     

3-氨基-5-羧基-1,2,4-三唑席夫碱的合成

含1,2,4-三唑环的席夫碱化合物一般都具有很好的生物活性。为了进一步探讨1,2,4-三唑席夫碱的合成,文中以3-氨基-5-羧基-1,2,4-三唑为原料,与取代芳醛反应,合成了8个3-氨基-5-羧基-1,2,4-三唑类席夫碱化合物。采用的反应条件为:3-氨基-5羧基-1,2,4-三唑与取代芳醛的摩尔比为1∶1,N,N-二甲基甲酰胺(DMF)为溶剂,冰醋酸为催化剂,在回流温度下反应3.5—4.5 h。化合物的结构通过IR,1H NMR和元素分析进行了表征。样品分析结果表明,在红外光谱中,所得目标产物在波数ν=1 600—1 625 cm-1处均出现C N的特征吸收峰;在1H核磁共振中,化学位移δ9附近有CH N的质子的化学位移出现。     

杂环类植物抗病毒剂的研究进展

介绍了近年来杂环类植物抗病毒剂的研究进展及开发情况，杂环类植物抗病毒剂化合物主要包括生物碱，吡啶衍生物，吡唑衍生物，咪唑衍一物，三唑衍生物，四唑衍生物，噻唑衍生物，噻二唑衍生物，吡唑衍生物，三嗪衍生物及喹啉肟醚等十一类。     

三唑类抗真菌药-氟康唑的研究进展

氟康唑是三唑类抗真菌药物,对于治疗深部真菌感染有显著疗效,毒副作用小,临床应用广泛。本文从氟康唑的抗真菌作用机制,药物动力学,临床应用范围,不良反应及氟康唑衍生物的合成等方面的研究进展进行了综述。     

农用杀菌剂研究开发的新进展（一）

本文对近期研究开发的农用杀菌剂作了简要的介绍。文中涉及三唑类、吡咯类、苯(苄)胺基嘧啶类、恶(咪)唑啉酮类、甲氧基丙烯酸酯类、氨基酸衍生物和酰胺类等化合物的结构、生物活性、作用机理以及应用等。     

有机物作为橡胶抗氧剂的评价

据《Polym.Degrad.Stab.》1997,57,283～292报道,埃及Mansoura大学化学系对一些有机化合物的抗氧化作用进行了研究,他们合成了一些三唑类、哑唑啉类及对苯二胺类衍生物,并在天然胶、丁苯胶及其硫化橡胶中进行了抗氧能力的研究.发现三唑类     

杀菌剂开发的新进展

对近期开发的农用杀菌剂做了简要介绍.文中涉及三唑类、Strobilurin类、氨基酸衍生物、磺酰胺类及其他类化合物的结构、生物活性、作用机理以及部分化合物的创制经纬.     

Investigation of triazole derived Schiff bases as corrosion inhibitors for mild steel in hydrochloric acid medium

3,5-Diamino-1,2,4-triazole Schiff base derivatives and their inhibition efficiency, based on the effect of changing functional groups, were reported to establish a relationship between inhibitor efficiency and molecular structure using weight loss method, electrochemical and Fourier transform infrared spectral techniques. It was found that the molecules containing more electron donating groups have higher inhibition efficiency than the corresponding compounds with low electron donating groups. The results indicate that the order of inhibition efficiency of the triazole and its Schiff bases in solution and the extent of their tendency to adsorb on mild steel surfaces are as follows: vanilidine 3,5-diamino-1,2,4-triazole > furfuraldine 3,5-diamino-1,2,4-triazole > anisalidine 3,5-diamino-1,2,4-triazole > 3,5-diamino-1,2,4-triazole.     

Synthesis,extraction, and anti‐bacterial studies of some new bis‐1,2,4‐triazole derivatives part I

A series of new bis triazole Schiff base derivatives (4) were prepared in good yields by treatment of 4‐amino‐3,5‐diphenyl‐4H‐1,2,4‐triazole (3) with bisaldehydes (1). Schiff bases (4) were reduced with NaBH₄ to afford the corresponding bisaminotriazoles (5). All the new compounds were characterized by IR, ¹H NMR and ¹³C NMR spectral data. Their overall extraction (log K_ex) constants for 1 : 1 (M : L) complexes and CHCl₃/H₂O systems were determined at 25 ± 0.1°C to investigate the relationship between structure and selectivity toward various metal cations. The extraction equilibrium constants were estimated using CHCl₃/H₂O membrane transfer with inductively coupled plasma‐atomic emission spectroscopy spectroscopy. The stability sequence of the triazole derivatives in CHCl₃ for the metal cations was exhibited a characteristic preference order of extractability to metal ions [Fe(III) > Cu(II) > Pb(II) > Co(II) > Ni(II) > Mn(II) > Zn(II) > Mg(II) > Ca(II)]. The compounds were tested for anti‐microbial activity applying agar diffusion technique for 11 bacteria. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Screening for Potential Antimicrobial Activities of Some Cationic Uracil Biocides Against Wide-Spreading Bacterial Strains

Eight novel uracil-based cationic surfactants containing Schiff base species were synthesized and characterized using elemental analysis, FTIR, ¹H-NMR and ¹³C-NMR spectroscopy. The surface activities of the synthesized Schiff bases and their cationic derivatives were determined based on interfacial tension measurements and partition coefficient values in water/octanol system. The synthesized Schiff bases and their cationic derivatives were evaluated as novel biocides against different bacteria and fungi strains. The results showed that the biocidal activity of the synthesized Schiff bases was considerably increased by quaternization. The influence of the cationic surfactants as biocides was increased by increasing the hydrophobic chain length and the presence of the methoxy groups. The biocidal activity was also increased by increasing the partition coefficient in water/octanol system. The structure and surface activity/biocidal activity of the different compounds were discussed.     

Preparation and antibacterial activity of C2-benzaldehyde-C6-aniline double Schiff base derivatives of chitosan

C₂-benzaldehyde-C₆-aniline double Schiff base derivatives of chitosan were synthesized with positioning protection method for the first time. The structures and properties of the new synthesized products were characterized by Fourier transform infrared spectroscopy, ¹³C nuclear magnetic resonance, scanning electron microscope image, X-ray diffraction, and elemental analysis. The elemental analysis results indicated that the degrees of substitution of the products were from 39.6% to 48.2%. The synthesized compounds exhibited an excellent solubility in organic solvents. The antibacterial activities of all of the derivatives were tested in the experiment, and the results showed that the prepared chitosan derivatives had significantly improved antibacterial activity of chitosan and C₂-benzaldehyde Schiff bases of chitosan toward Staphylococcus aureus (ATCC 25923) and Escherichia coli (ATCC 35218). Antibacterial activity of the Schiff bases against E. coli differs from the substituent at the same position of different anilines and increases as the sequence aniline?>?p-toluidine?>?o-toluidine, and the antibacterial activity of the Schiff bases against S. aureus increases as the sequence p-toluidine?>?aniline?>?o-toluidine. The I_C50 of the C₂-benzaldehyde-C₆-aniline double Schiff base derivatives of chitosan against E. coli and S. aureus is 0.0035 and 0.0031?mg?L^?1, respectively, much lower than that of chitosan (0.0064?mg?L^?1) and C₂-benzaldehyde Schiff bases of chitosan (0.0054?mg?L^?1). The cytotoxicity test showed that compared with chitosan and C₂-benzaldehyde Schiff bases of chitosan, the prepared chitosan derivatives had lower cytotoxicity against SCG-7901. This paper provided a new method for the synthesis of Schiff bases of chitosan, which was enlightening.     

烷基三唑硫酮席夫碱的合成和生物活性研究

为进一步研究三唑席夫碱化合物的合成与性质,以自制的5-烷基-4-氨基-1,2,4-三唑-3-硫酮与对甲氧基苯乙酮和取代芳醛为原料,在冰醋酸催化下,回流反应0.5 h,合成了1,2,4-三唑硫酮席夫碱化合物,其结构通过元素分析、红外光谱(IR)和核磁共振(1H NMR)进行表征。分析结果表明:在IR图谱中,目标产物在波数1 587—1 603 cm-l处出现席夫碱亚胺结构CHN的特征吸收峰;在1H NMR中,席夫碱亚胺结构CHN的质子化学位移δ在10.5附近出现,NC—CH3结构中H的化学位移在2.4左右。研究了化合物对烟草赤星病、马铃薯干腐病、小麦赤霉病、番茄早疫病、西瓜枯萎病5种植物病原菌的生物活性,得到毒力回归方程及相关系数,计算EC50和EC95值,结果表明它们具有较好的抑菌活性。含有吸电子取代基的席夫碱杀菌效果比给电子取代基的好。     

新型偶氮苯共轭席夫碱化合物的合成与表征

以对苯二甲醛与偶氮苯胺基化合物进行缩合反应合成系列新型具有不同取代基的含有偶氮苯共轭基团的席夫碱化合物。利用紫外光谱、红外光谱以及荧光光谱研究了目标产物的取代基效应,并用差热-热重分析方法对其热稳定性能进行测定。实验数据表明,对于分子内取代基团、共轭体系等因素的调控,可以得到性能迥异的席夫碱化合物,在功能材料等领域具有广泛的应用价值。     

Effect of pH on a gossypol complex with phospholipids: Gossypol-PE

PE, one of the major phospholipids in oilseed soapstock, may react with gossypol to form Schiff bases. PE amounts to 20–30% of the phosphorus compounds in soap-stock. In this report, the dependence on pH of the Schiff base products between PE and gossypol was investigated using a spectrophotometer, an HPLC equipped with an ELSD, and an LC-MS system. We observed that at pH 7 the Schiff reaction product and reactants were clearly detected by ELSD, absorption, and LC-MS spectra. The absorption spectra displayed the characteristic peak for the Schiff bases around 430–440 nm. The absorption spectra also indicated that the reaction was pH dependent. The reaction temperatures were 60 and 90°C. The LC-MS spectra supported the formation of Schiff bases as well as methyl ether derivatives of gossypol in alcohol at the elevated temperatures. The implications of these experimental findings are presented in this paper.     

4-氨基-1,2,4-三氮唑并芳香醛类希夫碱的合成与表征

三氮唑环为抗真菌药物的基本药效基团,为探索芳香醛缩氨基三氮唑的合成条件,以4-氨基-1,2,4-三氮唑与芳香醛为原料,在冰醋酸催化下合成了9种芳香醛类希夫碱,收率71.6%~92.3%,并通过元素分析、IR和1H NMR确定了目标化合物的结构。其中几种鲜见文献报道。同时讨论了影响反应收率的因素。     

β-氨基腈的合成

醛与伯胺缩合形成希夫碱,乙腈在二异丙基氨基锂的强碱性条件下形成负离子,对希夫碱中间体进行亲核加成,以78%~100%的总收率获得β-氨基腈类化合物。提供了一条合成β-氨基酸衍生物的有效合成途径。获得的产物β-氨基腈中,新化合物的结构经过IR、MS、1HNMR、13C NMR及元素分析确证。