N-甲氧基-N-[2-(1,6-2H-1-取代-6-羰基-哒嗪-3-氧甲基)苯基]氨基甲酸甲酯的合成及生物活性研究

为了寻找高效、低毒的农药, 设计合成了一系列新的N-甲氧基-N-[2-(1,6-2H-1-取代-6-羰基-哒嗪-3-氧甲基)苯基]氨基甲酸甲酯化合物3a～3k, 其结构经IR, ¹H NMR, LC/MS和元素分析确认. 生物活性测定表明, 部分化合物在50 mg/L下对小麦赤霉病菌(Gibberella zeae)、稻瘟病菌(Pyricularia oryzae)和黄瓜灰霉病菌(Botrytis cinerea)有较好的抑菌活性.     

1,3-二(乙氧基甲基)-5-N,N-二甲氨基-6-甲基尿嘧啶的合成

报道了1,3-二(乙氧基甲基)-5-N,N-二甲氨基-6-甲基尿嘧啶方便、高产率的合成方法. 以6-甲基尿嘧啶(1)为起始物, 经硝化、嘧啶N¹,N ³-烷基化、还原及氨基甲基化, 首次高产率合成了1,3-二(乙氧基甲基)-5- N,N -二甲氨基-6-甲基尿嘧啶(5), 并对其化学结构进行了表征.     

N-{4-{N-甲基-N-[2-羟基-3-(2,4-二氧代-1,2,3,4-四氢嘧啶-5-基)氨基]丙基}氨基-3-溴}苯甲酰基-L-谷氨酸二乙酯及其衍生物的合成

报道了N-{4-{N-甲基-N-[2-羟基-3-(2,4-二氧代-1,2,3,4-四氢嘧啶-5-基)氨基]丙基}氨基-3-溴}苯甲酰基-L-谷氨酸二乙酯及其衍生物的简便合成方法. 分别以4-氨基苯甲酸乙酯和4-氨基苯甲酰基-L-谷氨酸二乙酯为起始物, 经甲基化、烯丙基化、溴羟基化、环氧化、开环、脱保护等反应首次合成了6个新型5-取代氨基嘧啶类化合物, 并通过¹H NMR, ¹³C NMR 和MS对其化学结构进行了表征. 初步生物活性结果表明, 苯环侧链的L-谷氨酸酯部分是此类化合物抑制人重组二氢叶酸还原酶的必需结构.     

苯乙烯相连的卟啉-三芳胺共轭体的合成及表征

以三芳胺甲醛和4-二乙氧基甲基苄基亚磷酸二乙酯为原料经Wittig-Horner反应制得化合物4-[4-(N,N-二苯胺基)苯乙烯基]苯甲醛, 4-[4-(N,N-二对甲苯胺基)苯乙烯基]苯甲醛和4-[4-(N,N-二对甲氧基苯胺基)苯乙烯基]苯甲醛, 这些化合物与吡咯在丙酸中回流得到一类通过苯乙烯相连的卟啉-三芳胺共轭体, 并采用¹H NMR, ¹³C NMR, MS及UV-vis对卟啉化合物的结构进行了表征.     

取代吲哚-3-甲醛类化合物的合成

取代邻硝基甲苯(1)、N,N-二甲基甲酰胺二甲基缩醛或二乙基缩醛和哌啶在溶剂N,N-二甲基甲酰胺中缩合制得取代的β-哌啶基-2-硝基甲苯(2), 2用铁粉和冰醋酸还原环合得到取代吲哚(3), 将3与三氯氧磷和N,N-二甲基甲酰胺通过Vilsmeier-Hacck反应制得了取代吲哚-3-甲醛类化合物4和5. 化合物4和5的结构经元素分析, IR和¹H NMR确认.     

含氨基酸席夫碱的5-氟尿嘧啶衍生物的合成及其抗肿瘤活性

以N 1-(2-四氢呋喃烷基)-5-氟尿嘧啶为原料, 与1,4-二溴丁烷反应, 得到N¹-(2-四氢呋喃烷基)-N³-(4-溴丁基)-5-氟尿嘧啶(2), 最后与氨基酸席夫碱的钾盐缩合, 得到13个新的目标化合物3. 其结构经IR, ¹H NMR, MS和元素分析确证. 初步的体外抗肿瘤试验结果表明, 目标化合物具有一定的抗肿瘤活性.     

4-(氮杂-15-冠-5)-1,8-萘酰亚胺荧光探针的合成及性能研究

N-丁基-4-溴-1,8-萘酰亚胺与二乙醇胺反应, 合成了N-丁基-4-二(2-羟乙基)氨-1,8-萘酰亚胺, 进一步与对甲基苯磺酸二缩三乙二醇双酯反应合成了N-丁基-4-(氮杂-15-冠-5)-1,8-萘酰亚胺. 用NMR, IR, MS等表征了产物结构. 该化合物在二氯甲烷溶液中识别Li^＋和Na^＋, 识别后吸收光谱和荧光光谱蓝移.     

N-(安替比林-4-基)-N'-取代芳甲酰基硫脲的合成及其生物活性

合成了12个含安替比林基的取代芳甲酰基硫脲类化合物, 用¹H NMR, IR和元素分析确证了它们的结构, 并进行了室内生物活性测试. 生测实验证明部分酰基硫脲类化合物, 比如N-(安替比林-4-基)-N'-m(或o)-甲苯甲酰基硫脲, N-(安替比林-4-基)-N-o-硝基苯甲酰基硫脲, N-(安替比林-4-基)-N'-m(或p)-氯苯甲酰基硫脲, 具有一定的细胞分裂素活性.     

含甲硫基和肟醚基的N-甲氧基氨基甲酸酯类化合物的合成及生物活性研究

为了寻找高效、低毒的农药, 设计合成了一系列新的含甲硫基和肟醚基的N-甲氧基氨基甲酸酯类化合物5a～5q, 其结构经IR, ¹H NMR, LC/MS和元素分析确认. 生物活性测定表明, 部分化合物在50 mg/L下对稻瘟病菌(Pyricularia oryzae)、灰霉病菌(Botrytis cinerea)、水稻纹枯病菌(Rhizoctonia solani)和小麦白粉病菌(Blumeria griminis)有很好的抑菌活性.     

N-取代苯基-2-取代-1,3-噻唑烷-3-甲酰胺的合成、结构及生物活性

为了寻找新的含噻唑杂环的先导化合物, 利用2-取代-1,3-噻唑烷与取代苯基异氰酸酯在三乙胺催化下发生偶合反应, 合成了17个N-取代苯基-2-取代-1,3-噻唑烷-3-甲酰胺化合物3, 并利用¹H NMR, IR, MS和元素分析对其结构进行了表征. 用X-ray单晶衍射测定了N-苯基-2-氧代-1,3-噻唑烷-3-甲酰胺(3a)的晶体结构. 初步生物活性试验结果表明, 在试验浓度下部分目标化合物具有一定的杀菌和杀虫活性.     

无溶剂条件下5,6-二取代-2,3-吡啶二酮的合成

在无溶剂条件下, 由3-羟基-2(1H)-吡啶酮与取代苯胺在NaIO₃作用下合成了一系列5,6-二取代-2,3-吡啶二酮, 产物结构由元素分析, ¹H NMR, MS, IR得到确认. 该方法具有反应条件温和、操作简单和产率高等优点.     

圆盘状α-Co(OH)2的控制合成及其电化学性能

采用AAO模板及后处理方法合成了圆盘状α-Co(OH)₂并研究了其电化学电容性能. 在该合成方法中, 先采用阳极氧化铝模板结合交流电沉积的方法获得钴纳米线, 而后将其在碱液中通过溶解氧氧化生成终端产物. 用红外光谱(FT-IR), X射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)表征了产物的结构和形貌; 用循环伏安、恒电流充放电测试方法对其电化学性能进行了测试. 此外, 对圆盘状Co(OH)₂的形成机理进行了初步探讨. 结果表明, 用此方法合成的Co(OH)₂具有圆盘状形貌, 属α相态, 且表现出较好的电容特性.     

2-(2’,6’-二氯苯基)-1,3-噻唑烷-4-酮衍生物的微波促进合成及抗真菌、 抗肿瘤活性研究

利用微波促进的方法, 以2,6-二氯苯甲醛、胺和巯基乙酸为原料, 合成了系列N-3位不同取代基团的噻唑烷酮衍生物. 部分化合物在Lawesson试剂作用下, 合成了其系列噻唑烷4-硫酮衍生物. 所有化合物通过IR, 1H NMR, MS和元素分析等方法确定结构. 测试了化合物对黄瓜白粉病菌的抑制活性和对宫颈癌细胞的毒性作用, 部分化合物表现出较好的生物活性.     

The electrochemical behavior and characterization of the anodic oxide film formed on titanium in NaOH solutions

Titanium dissolution and passivation were studied in NaOH aqueous solution using open-circuit potential, potentiodynamic and potentiostatic techniques. Potentiodynamic data showed that the active-passive transition involves active metal dissolution followed by formation of a poorly conducting passive oxide film that passivates the electrode. The critical current density varied with pH as d log<I> j</I><SUB>m</SUB>/d pH=-0.098 in the pH range 11.00–14.00, while the passivation potential is changed according to the following two features: at pH 10.55–13.00, d<I>E</I><SUB>m</SUB>/d pH=-0.06 V; and at pH 13.50–14.00, d<I>E</I><SUB>m</SUB>/d pH=-0.40 V. The apparent activation energy, E*, was calculated from the slope of the Arrhenius plot and was found to be 12.6 kJ mol^–1. Current-time transients showed that the growth of titanium oxide passive film is a diffusion-controlled process. XPS measurements indicated that the passive oxide film consists mainly of TiO₂ and a mixture of suboxides of Ti₂O₃ and TiO. Electronic Publication     

无标记DNA在氨基改性导电聚吡咯表面的固定/杂交

通过吡咯(Py)与其衍生物——6-吡咯己胺(PyHA)的共聚物聚(吡咯-co-6-吡咯己胺)[poly(Py-co-PyHA)]的合成研究,并采用电化学循环伏安法来考察体系的电化学活性.在缓冲溶液中,由于探针DNA链上的负电荷与共聚物分子链上的正电荷之间存在强烈的静电吸引力,使得DNA能够固定在导电聚合物膜上.实验结果证明,目标DNA和聚吡咯薄膜之间不存在非特异性吸附,而能和探针DNA进行顺利杂交.此结果为以后研究更为敏感的DNA固定及导电聚合物敏感膜提供了实验基础.     

N-(2-(腈基(4,6-二甲氧基嘧啶-2-基)甲基)苯基)酰胺类衍生物的合成及生物活性

以2-(2-硝基苯基)乙腈及4,6-二甲氧基-2-甲磺酰基嘧啶为起始原料,分别经缩合、还原及酰胺化反应合成了6个未见文献报道的N-(2-(腈基(4,6-二甲氧基嘧啶-2-基)甲基)苯基)酰胺类衍生物,其结构经1H NMR、MS和元素分析进行了确证。 在150 g/hm2的用量条件下,合成化合物未显示出除草活性。 在200 mg/L浓度下,部分化合物对黄瓜灰霉病及水稻纹枯病表现出一定的抑菌作用,其中化合物4d对水稻纹枯病的抑制率为72.33%。     

Synthesis,anti-inflammatory and analgesic activity of 2-[4-(substituted benzylideneamino)-5-(substituted phenoxymethyl)-4H-1,2,4-triazol-3-yl thio] acetic acid derivatives

The title compounds 3a–l have been synthesized by the reaction of thiocarbohydrazide with substituted phenoxy acetic acid to obtained substituted 1,2,4-triazoles (1). Compound 1 was treated with various substituted aromatic aldehydes which results in 4-(substituted benzylideneamino)-5-(substituted phenoxymethyl)-2H-1,2,4-triazol-3(4H)-thiones (2a–g), further 2a–g is converted to 2-[4-(substituted benzylideneamino)-5-(substituted phenoxymethyl)-4H-1,2,4-triazol-3-yl thio] acetic acid (3a–l) derivatives by the reaction with chloroacetic acid. All the newly synthesized compounds were evaluated for in vivo anti-inflammatory and analgesic activities. Among the series 2-[4-(2,4-dichlorobenzylideneamino)-5-(phenoxymethyl)-4H-1,2,4-triazol-3-yl thio] acetic acid (3d), 2-[4-(4-dichlorobenzylideneamino)-5-(phenoxymethyl)-4H-1,2,4-triazol-3-yl thio] acetic acid (3e), 2-[4-(2,4-dichlorobenzylideneamino)-5-[(2,4-dichlorophenoxy)methyl]-4H-1,2,4-triazol-3-yl thio] acetic acid (3j) and 2-[5-[(2,4-dichlorophenoxy)methyl)]-4-(4-chlorobenzylideneamino)-4H-1,2,4-triazol-3-yl thio] acetic acid (3k) showed significant anti-inflammatory activity with P < 0.001 (63.4%, 62.0%, 64.1% and 62.5% edema inhibition, respectively), as compared to the standard drug diclofenac (67.0%) after third hour respectively and also compounds 3j, 3k exhibited significant analgesic activity with P < 0.001 (55.9% and 54.9% protection, respectively) and less ulcerogenic activity as compared with standard drug aspirin (57.8%).     

Synthesis and anti-HIV-1 activity of a series of 1-(alkoxymethyl)-5-alkyl-6-(arylselenenyl)uracils and -2-thiouracils

A series of 1-(alkoxymethyl)-5-alkyl-6-(phenylselenenyl)uracils and -2-thiouracils modified at the 3- and/or 5-position of the C-6 phenylselenenyl ring with methyl or fluoro substituent has been synthesized and tested for their ability to inhibit HIV-1 replication. Lithiation of the acyclic uracil and 2-thiouracil derivatives 11-14 and 27-32 with lithium diisopropylamide or lithium bis(trimethylsilyl)amide followed by reaction with an appropriate diaryl diselenide afforded 6-arylselenenyl compounds 18-26 after removal of the tert-butyldimethylsilyl protecting group and 35-47 . Compounds 48-54 were prepared from compounds 38-44 by oxidative hydrolysis of the thione function. Of these compounds, 50 inhibited HIV -1 replication in human T₄ lymphoblastoid cells at a 50% effective concentration (EC₅₀) of 0.0047 μM with a selectivity index of >42600.     

A facile synthesis of novel 5‐substituted pyridine 2 carboxamide derivatives and their biological evaluation and 3D QSAR studies

A variety of novel 5‐substituted pyridine 2 carboxamides were designed and synthesized using both normal and solvent‐free microwave (MW) irradiation techniques. The results revealed that MW protocol proceeded smoothly under mild reaction conditions in short reaction times, thus avoiding the use of toxic organic solvents. Structural elucidation of the synthesized compounds was carried out on the basis of various spectroscopic methods, such as ¹H NMR, ¹³C NMR, LCMS, and IR. The synthesized compounds were evaluated for their in vitro antimicrobial activity (MIC) using the agar disk diffusion method. Among the various synthetic compounds, compound 3b showed higher potential activity against Escherichia coli than the other compounds. The order of activity against E. coli of the studied compounds is 3b > 3e > 3g > 3h > 3d > 3c > 3a > 3f . Additionally, 2D and 3D structural features of the synthesized derivatives were recognized by the 3D‐QSAR model. This validated model exhibited good internal (r², 0.924) and external prediction (r²pred, 0.851) correlation. The results of QSAR studies concluded that Alog P, the number of hydrogen bond acceptors, and the number of rotatable bonds were necessary features for the activity of the pyridine carboxamide derivatives.     

Design,synthesis and evaluation of 2-(4-(substituted benzoyl)-1,4-diazepan-1-yl)-N-phenylacetamide derivatives as a new class of falcipain-2 inhibitors

The cysteine protease, falcipain-2 is an important drug target in human malaria parasite Plasmodium falciparum. A new series of 2-(4-(substituted benzoyl)-1,4-diazepan-1-yl)-N-phenylacetamide derivatives 5(a–t) were designed as per pharmacophoric requirements of falcipain-2 inhibitors using ligand-based approach. The target compounds were synthesized from the key intermediate, 2-(1,4-Diazepan-1-yl)-N-phenylacetamide, by coupling it with appropriate carboxylic acids using carbodiimide chemistry. Structural features of target compounds were characterized by spectral data (¹H NMR, and mass) and elemental analyses. The purity of the final compounds was confirmed by HPLC. The compounds were tested for their in vitro falcipain-2 inhibitor activity on recombinant falcipain-2 enzyme. Five compounds 5b, 5g, 5h, 5j, 5k showed good inhibitory activity (>60%), against falcipain-2 at 10 μM concentration, and fifteen compounds showed weak to moderate inhibitor activity. Compound 5g, the most potent compound from this series showed 72% inhibition at 10 μM concentrations.