木犀草素缩磺胺甲恶唑席夫碱及金属配合物的研究

目的:寻找新型席夫碱和新的抑菌药物。方法:以木犀草素和磺胺甲恶唑进行缩合反应制成新的黄酮席夫碱化合物;并以此为配体合成了新的金属配合物。进行了初步的抗菌活性实验。结果:经元素分析、红外光谱、紫外光谱确证其结构组成。结论:结果表明,新化合物对多种菌株有明显的抑菌活性且优于各自的母体。     

2-乙酰噻吩吖嗪及其过渡金属配合物的合成与活性

目的 研究2-乙酰噻吩吖嗪及其过渡金属Cu^2 ，Fe^3 配合物的合成与生物活性。方法 从2-乙酰噻吩和水合肼出发合成2-乙酰噻吩吖嗪，进而合成了其过渡金属Cu^2 ，Fe^3 的配合物。用MS，^1H—NMR对配体进行了确认。通过元素分析、摩尔电导率、红外光谱、紫外光谱等手段对配合物进行了表征。用NBT法研究了配合物对超氧阴离子自由基的抑制作用；并利用MTT法和SRB法对其进行了抗肿瘤活性体外筛选实验。结果 发现配体和配合物都具有一定的生物活性，且Cu配合物活性较好。结论 配合物的生物活性可能与中心离子的最外层d轨道的电子结构有关。     

3,5-二硝基水杨醛缩甘氨酸铜(Ⅱ)配合物的合成、表征及其抗O-.2活性

在水杨醛苯环上引入吸电子基并与甘氨酸缩合,设计合成了3,5-二硝基水杨醛缩甘氨酸席夫碱及其铜(Ⅱ)配合物,对配合物进行了元素分析、摩尔电导、红外光谱、紫外光谱等系列表征,讨论了配合物中金属配体键合作用以及配合物的结构,并用黄嘌呤-黄嘌呤氧化酶-鲁米诺化学发光法测定了其歧化超氧阴离子的活性,与超氧化物歧化酶(SOD)作了对照,发现该配合物有较强的清除O-.2作用,显示较强的SOD样活性,在一定程度上具有模拟SOD酶的作用.     

新型双核席夫碱化合物的合成及荧光活性研究

以水杨醛与N,N,N',N'-四[2-(2-氨基乙氨基)甲酰基乙基]乙二胺反应合成了一种新型八齿席夫碱配体(H4L)及其锌配合物,通过元素分析1、HNMR、IR、紫外光谱、摩尔电导等手段对配体及其配合物进行结构和组成进行表征。同时在DMSO溶液中测定了该双核席夫碱及其锌配合物的荧光活性。     

姜黄素-钌配合物的合成和抗氧化活性研究

目的合成和表征了姜黄素-钌金属配合物,并对其抗氧化活性进行初步的研究。方法以姜黄素为配体合成其钌的配合物,用红外光谱、紫外光谱、元素分析对配合物进行了表征,并进行抗氧化活性初步筛选。结果合成了姜黄素-钌的金属配合物,并确定其结构。结论活性筛选结果表明,配合物对自由基清除活性好于姜黄素。     

木犀草素Cu(II)配合物的合成与结构表征

目的：木犀草素配合物的研究。方法：在无水乙醇溶剂中，通过溶解、回流合成了木犀草素和醋酸铜金属配合物，并通过元素分析、红外光谱、电子光谱和摩尔电导等表征手段，初步确定了配合物的结构。结果：通过分析可以基本得到金属配合物的分子式和结构：M2L2(Ac)4。结论：得到所合成配合物。     

姜黄素金属配合物的合成、表征和抗肿瘤活性研究

目的:合成和表征了4个姜黄素的金属配合物,并对其抗肿瘤活性进行初步的研究.方法:以姜黄素为配体合成其乙酰丙酮氧钒、锌、铜、锡的配合物,用红外光谱、紫外光谱、元素分析对配合物进行了表征,并进行体外抗肿瘤活性初步筛选.结果:合成了4个姜黄素的金属配合物,并确定其结构.结论:药理活性筛选结果表明,多个配合物对肿瘤K562,HL-60细胞有效,部分配合物显示了较强的抗癌活性.     

新型含硫酰基吡唑啉酮席夫碱稀土配合物的合成与结构表征

目的 :含硫席夫碱配合物的研究。方法 :在无水溶剂中 ,通过溶解、回流合成了未见报道的吡唑啉酮席夫碱两种稀土金属配合物。对所合成的配体和配合物进行了元素分析、电子光谱、红外光谱、差热—热重 ,并辅电导测定 ,从而初步确定了它们的分子结构式。结果 :通过分析可以基本得到稀土配合物的分子式和结构 :ML3(NO- 3) 3.3H2 O。结论 :得到所合成配合物。     

大黄酸金属配合物的抑菌活性研究

目的:合成大黄酸的三种金属配合物并对其结构进行表征,对比研究配体和配合物对三种细菌的体外抑菌活性大小。方法:在无水乙醇中合成了大黄酸的三种金属配合物,采用紫外光谱法,红外光谱法,核磁共振氢谱法对产物结构进行表征,确定了配合物的组成及结构。采用二倍稀释法测定了配合物的最小抑菌浓度(MIC),采用滤纸片法测定了配体及配合物对金黄色葡萄球菌、肺炎链球菌、大肠杆菌的抑菌活性大小。结果:合成的配合物经结构表征后,初步确定了其可能结构式为2分子大黄酸和1分子金属离子配位,抑菌活性测试结果表明,配合物的抑菌活性强于配体,其中大黄酸锰对于金黄色葡萄球菌以及大肠杆菌抑制作用都最强,抑菌圈大小分别达到了23.3、20.5 mm;而大黄酸钴对肺炎链球菌抑菌活性最强,抑菌圈达22.5 mm。二倍稀释法得出了配合物和配体的MIC值(最小抑菌浓度),根据该值大小可知,配合物抑菌活性总体上强于配体,但也有少部分与配体相当。结论:大黄酸和金属离子形成配合物后,抑菌活性增强。     

含有黄嘌呤衍生物的N-杂环卡宾金属配合物的生物活性研究进展

N-杂环卡宾(NHC)是一类多功能的配体,能够与过渡金属形成稳定的配位化合物,在催化、药学和材料科学等领域有着广泛的应用。黄嘌呤衍生物具有抗肿瘤转移和抗血管生成等生物活性,且结构易于修饰。将黄嘌呤衍生的NHC配体与过渡金属相结合有望得到具有全新生物活性的金属配合物。综述黄嘌呤衍生物的生物活性,以及黄嘌呤衍生的NHC金属配合物的结构特点和生物活性,并对黄嘌呤NHC金属配合物的研究进行了总结和展望,以期为进一步的研究提供参考。     

Development and evaluation of cefadroxil drug loaded biopolymeric films based on chitosan-furfural schiff base

Cefadroxil drug loaded biopolymeric films of chitosan-furfural schiff base were prepared by reacting chitosan with furfural in presence of acetic acid and perchloric acid respectively for the external use. Prepared films were evaluated for their strength, swelling index, thickness, drug content, uniformity, tensile strength, percent elongation, FTIR spectral analysis and SEM. The results of in vitro diffusion studies revealed that the films exhibited enhanced drug diffusion as compared to the films prepared using untreated chitosan. The films also demonstrated good to moderate antibacterial activities against selective gram positive and gram negative bacteria.     

Synthesis and Antimicrobial Evaluation of 5-Iodopyrimidine Analogs

4-Substituted-5-iodo-2-benzylthiopyrimidines were prepared efficiently in three steps. 2-Benzylthiopyrimidine on iodination in presence of base gave 5-iodo-2-benzylthiopyrimidine (1), which on chlorination with excess of POCl₃ furnished 4-chloro-5-iodo-2-benzylthiopyrimidine (2). Reaction of 2 with substituted aromatic amines, 2-aminopyridine and hydrazine hydrate yielded 4-amino-5-iodo-2-benzylthiopyrimidines 3(a-e), (3f) and (3g) respectively. Further, 4-hydrazino-5-iodo-2-benzylthiopyrimidine on condensation with substituted aromatic and heterocyclic aldehydes afforded the corresponding schiff bases 4(a-h). The structure of synthesized compounds have been established by spectral studies and elemental analysis. Synthesized compounds have been screened for antimicrobial activity. Compound 3f exhibited good antifungal activity against A. niger. The compounds 4a, 4c, 4d, 4g and 4h exhibited good antibacterial activity.     

Synthesis and antibacterial activity of some Schiff bases and 4-thiazolidinones

Some new schiff bases (1a-d) 4-thiazolidinones (2a-d) have been synthesised and tested for their antibacterial activity. The structures of these compounds have been established on the basis of elemental analysis and spectral data (IR and H1 NMR).     

含硫三环氟喹诺酮类化合物的合成及其抗菌活性研究

目的：寻找具有更好抗菌活性的含硫三环氟喹诺酮类化合物。方法：在芦氟沙星母核的10位引入不同基团，设计并合成8个含硫三环氟喹诺酮类化合物，并测定其体外抗菌活性。结果：合成了目标化合物，其结构经IR、^1HNMR、MS和元素分析确证；它们具有不同强度的抗菌活性，其中几个化合物的抗菌活性优于芦氟沙星。结论：初步的体外抗菌实验证实所合成目标化合物具明显的抗菌活性，甚至优于芦氟沙星。     

新型双核Cu(Ⅱ)席夫碱化合物的合成及其模拟超氧化物歧化酶活性研究

用双乙酰丙酮和席夫碱半体(H2L0)合成得到双席夫碱配体(I)及其双核Cu(II)配合物(II),通过元素分析、1HNMR、IR、UV-vis和MS等对其进行了表征,并采用邻苯三酚自氧化法测定了它们模拟超氧化物歧化酶(SOD)活性。结果表明,它们均具有良好的SOD活性。     

New broad-spectrum alkylthio cephalosporins

A series of 7-substituted alkyl-thio-acylaminocephalosporins with the following general formula were prepared and tested for in vitro antibacterial activity: (formula: see text). We tried in our research to find any relationship between antibacterial activity and pharmacokinetic properties on the one hand, and chemical structure on the other. The most interesting products were also studied for their in vivo antibacterial activity in experimental acute systemic infections in the mouse.     

Schiff base pyrazolone complexes of iron (III): synthesis,characterization, antimicrobial and antioxidant activity

A series of novel Schiff base tetradentate ligands and its iron (III) coordination compounds were synthesized, characterized and evaluated for antibacterial and antioxidant activity. All the synthesized ligands and complexes were characterized by spectroscopic and crystallographic techniques. Electronic spectra, Mössbauer spectra, magnetic moment and conductance study evidence the fact of octahedral arrangement around iron (III). The in vitro antimicrobial Schiff base complexes bear polar and nonpolar properties together; this makes them suitable for permeation to the cells and tissues, it enhances the activity against the bacteria. The antioxidant properties were measured with DPPH (2,2’-diphenyl-2-picrylhydrazyl). These properties were due to the unique feature of ligands such as highest lipophilicity, lowest electron withdrawing power and highest polarisability.     

Triorganotin(IV) complexes with biologically potent schiff bases: infrared, ¹¹⁹Sn spectral characteristics and antimicrobial applications

This review paper has attempted information specific to the title compound. This survey of the literature data provides useful information about the design and stabilities of the triorganotin with biologically active ligands. Up to now, considerable efforts have been made to synthesize and characterize triorganotin(IV) schiff base complexes with the general formulae R3ML [R = organic group, M: Sn and L: schiff base] and many studies have been focused in order to understand bioassay results. Users with an interest in this substance are strongly encouraged for future research that this is still a very open field.     

Antibacterials. synthesis and structure-activity studies of 3-aryl-2-oxooxazolidines. 4. Multiply-substituted aryl derivatives.

The synthesis and structure-activity relationship (SAR) studies of the effect of different polysubstitution patterns in the aromatic ring of 5-(acetamidomethyl)oxazolidinone antibacterials (I) on antibacterial activity are presented. Compounds I were prepared by the six-step synthesis described previously (Gregory, W. A.; et al. J. Med. Chem. [formula: see text] 1989, 32, 1673), electrophilic aromatic substitution reactions of 3-substituted compounds, and functional-group interchange reactions of 3,4-disubstituted compounds. Antibacterial evaluation of compounds I against Staphylococcus aureus and Enterococcus faecalis gave the following results. The 2,4- and 2,5-disubstituted derivatives have weak or no antibacterial activity. Antibacterial activities of 3,4-disubstituted compounds are comparable to those of the 4-monosubstituted analogues for small 3-substituents (smaller than Br), but decline rapidly for larger 3-substituents. 3,4-Annulated derivatives are comparable in activity to their open-chain analogues. 3,5-Disubstituted and 3,4,5- and 2,4,6-trisubstituted derivatives are devoid of antibacterial activity.