新型喹唑啉酮类先导物的设计、合成及抑制人顶体酶活性研究

目的基于人精子顶体酶活性位点的三维结构设计并合成新型3-取代喹唑啉酮类化合物。方法计算机模拟设计及化学合成。结果设计并合成了7个3．取代喹唑啉酮类先导物,进行了抑酶活性测试。结论所有合成的化合物具有较好的抑酶活性,其中化合物3g是对照物Na-对甲苯磺酰-L-赖氨酸氯甲基酮（TLCK）的229倍。     

苯并咪唑-哒嗪酮类化合物的设计与合成及其抗血小板聚集活性

以具有抗血小板聚集活性的苯并咪唑类化合物和哒嗪酮类化合物为先导化合物 ,运用药物化学的拼合原理 ,设计并合成了 6个新的苯并咪唑 哒嗪酮类化合物及 6个新的苯并咪唑 苯并哒嗪酮类化合物 ,并经NMR和MS进行了结构鉴定 ,对其进行了抗血小板聚集的药理活性筛选。结果表明所合成目标化合物基本无抗血小板聚集活性     

2—烷硫基苯并咪唑的合成及其抗寄生虫活性

在5(6)-取代苯并咪唑的2位引入烷硫基,合成了40个化合物。化合物21、3a和39对棘球蚴的抑囊率分别为40％、64％和72％。     

-组新的N-羟基肉桂酰胺类组蛋白去乙酰化酶抑制剂的合成和初步活性研究

目的 设计合成了一组新的N-羟基肉桂酰胺类衍生物并测定其对组蛋白去乙酰化酶(HDACs)的抑制活性.方法 以阿魏酸为原料,经酯化、Williamson反应、皂化、缩合4步反应合成了一组新的N-羟基肉桂酰胺类衍生物;用组蛋白去乙酰化酶活性检测试剂盒测定该组化合物体外抑酶活性.结果 与结论 合成了11个未见文献报道的N-羟基肉桂酰胺类衍生物,其结构经过1H-NMR、MS、和IR确认.其中化合物5a、5b、5e和5k的体外抑酶活性较强(IC50=2～15μmol·L-1),有可能具有抗肿瘤活性,值得进一步研究.     

苯并咪唑类聚腺苷二磷酸核糖聚合酶抑制剂的合成及初步活性研究

目的 设计合成一系列苯并咪唑类衍生物,并测定其聚腺苷二磷酸核糖聚合酶(PARP)抑制活性.方法 以3-硝基邻苯二甲酸酐为基本原料,经开环、Hofmann重排、酰胺化或酯化、还原得到邻二氨基苯化合物,再与相应的苯甲醛及其衍生物环合得到目标分子;采用体外抑酶试验初步筛选目标分子的PARO抑制活性.结果与结论 合成了22个苯...     

一组新的N-羟基肉桂酰胺类组蛋白去乙酰化酶抑制剂的合成和初步活性研究

目的设计合成了一组新的N-羟基肉桂酰胺类衍生物并测定其对组蛋白去乙酰化酶（HDACs）的抑制活性。方法以阿魏酸为原料，经酯化、Williamson反应、皂化、缩合4步反应合成了一组新的N-羟基肉桂酰胺类衍生物；用组蛋白去乙酰化酶活性检测试剂盒测定该组化合物体外抑酶活性。结果与结论合成了11个未见文献报道的N一羟基肉桂酰胺类衍生物，其结构经过。H-NMR、MS、和IR确认。其中化合物5a、5b、5e和5k的体外抑酶活性较强（IC50=2--15 μmol·L^-1），有可能具有抗肿瘤活性，值得进一步研究。     

四氢苯并咪唑类衍生物的合成及其环氧合酶-2抑制活性

目的 寻找新型不良反应小的环氧合酶-2(COX-2)选择性抑制剂.方法 结合典型COX-2选择性抑制剂基本结构特征,设计并合成一系列新型四氢苯并咪唑类化合物.采用化学发光法测试化合物对环氧合酶-2的抑制活性.结果与结论 设计并合成了13个新型四氢苯并咪唑类化合物,其结构经元素分析、1H-NMR、13C-NMR和MS确证,所有化合物均未见文献报道.部分化合物对环氧合酶-2的抑制活性结果表明,化合物1、3、6对COX-2有一定的抑制作用.     

新型L-精氨酸衍生物的设计、合成及其生物活性研究

目的设计合成L-精氨酸衍生物类氨肽酶N(APN)抑制剂,并通过活性研究寻找先导化合物。方法以L-精氨酸为原料,经胍基保护、缩合、异羟肟酸化等步骤合成目标化合物,通过体外抑酶实验和抗肿瘤细胞增殖实验测定目标化合物的活性。结果合成了16个未见文献报道的L-精氨酸衍生物,结构经核磁共振氢谱及质谱确证。其中,化合物5e、5h、11e、11g、11h的体外抑酶活性较好,化合物5f抗肿瘤细胞活性最好,能抑制4种高表达APN的肿瘤细胞HL-60、A549、ES-2、PLC的增殖。结论目标化合物有较好的APN抑制活性和抗肿瘤细胞增殖活性,其中化合物5f可作为先导化合物展开进一步研究。     

流感病毒神经氨酸酶抑制剂的合成筛选

总结流感病毒神经氨酸酶抑制剂有效的结构特点及其结晶结构，对神经氨酸酶抑制剂进行了合成探索和构效关系研究，共设计合成6个未见报道的新化合物，其中3个为目标物，3个为中间体，通过MS，^1H-NMR证明其结构，并测定了它们的抑酶活性，结果所有化合物对神经氨酸酶都显示一定活性，同时还测定了这几个化合物抗流感病毒株粤防72-243的活性及体外抗HIV-1整合酶活性。     

N-取代苯甲酰胺类衍生物的合成与抗肿瘤活性

为寻找新型具有抗肿瘤活性的组蛋白去乙酰化酶 (HDACs) 抑制剂, 合成了HDACs抑制剂MS-275, 并以其为先导结构设计合成了11个N-取代苯甲酰胺类目标化合物, 测定体外抗肿瘤及抑酶活性。MS-275及目标化合物的结构经¹H NMR及HR-MS分析确证。体外抑HDAC活性研究表明, 化合物9d的抑酶活性与阳性对照药MS-275相当, 值得进一步深入研究; 化合物5c、5d和9c表现出明显量效关系, 具有一定抑酶活性。在对各细胞株的体外抗增殖作用研究中, 发现除9e外, 其他10个化合物显示了对Hut 78的不同抑制活性, 并表现出对Hut 78细胞株具有一定的选择性。     

Synthesis and biological evaluation of 1-(3-chloro-2-oxo-4-phenylazetidin-1-yl)-3-(2-oxo-2-(10H-phenothiazin-10-yl)ethyl)urea derivatives

A new series of eleven novel 1-(3-chloro-2-oxo-4-phenylazetidin-1yl)-3-(2-oxo-2-(10H-phenothiazin-10-yl)ethyl)urea derivatives were synthesized by cyclocondensation of various Schiff bases of phenothiazine with chloroacetyl chloride in the presence of triethylamine. Various Schiff bases of phenothiazine were synthesized by condensation of 4-(2-oxo-2-(10H-phenothiazin-10-yl)ethyl semicarbazide with various aryl aldehydes. The synthesized compounds were characterized by IR, MASS and ¹H NMR spectral data and evaluated for in vitro antimicrobial, antitubercular, antioxidant and anticancer activities by disc diffusion method, MIC method, REMA, DPPH, FRAP and MTT assay method, respectively. All synthesized compounds showed moderate-to-significant anti-bacterial and anti-fungal activity and compound 4d, 4g, 4h and 4k showed good antioxidant activity with EC₅₀ value of 55, 57, 56 and 47 μg/ml tested by DPPH method. The compounds 4j at a concentration of 10 μg/ml showed inhibition against the growth of Mycobacterium tuberculosis and 4f showed significant activity against human cervical cancer cell line with IC₅₀ values of 18.26 μM.     

Synthesis and anticonvulsant activity evaluation of 8-alkoxy-5-(4H-1,2,4-triazol-4-yl)quinoline derivatives

Two series of 8-alkoxy-5-(4H-1,2,4-triazol-4-yl)quinolines and 8-alkoxy-5-(2H-1,2,4-triazol-3-one-4-yl)quinolines were synthesized. The anticonvulsant activity of these compounds was evaluated with maximal electroshock seizure test and rotarod test. Among the synthesized compounds, 8-octoxy-5-(4H-1,2,4-triazol-4-yl)quinoline (4g) was the most active compound with ED₅₀ of 8.80 mg/kg, TD₅₀ of 176.03 mg/kg and protective index of 20.0. Its neurotoxicity was lower than all other synthesized compounds and also markedly lower than that of the reference drug carbamazepine. In addition, the potency of compound 4g against seizures induced by pentylenetetrazole, 3-mercaptopropionic acid, and bicuculline suggested its broad spectrum activity, and the mechanisms of action including inhibition of voltage-gated ion channels and modulation of GABAergic activity might involve in its anticonvulsant activity.     

Synthesis of 2-[4,5-dimethyl-1-(phenylamino)-1H-imidazol-2-ylthio]-N-(thiazole-2-yl)acetamide derivatives and their anticancer activities

In this work, 2-(4,5-dimethyl-1-(phenylamino)-1H-imidazol-2-ylthio)-N-(thiazol-2-yl) acetamide derivatives were synthesized by reacting 4,5-dimethyl-1-(phenylamino)-1H-imidazole-2(3H)-thione derivatives with some 2-chloro-N-(thiazol-2-yl)acetamide compounds. The structure of synthesized compounds was confirmed by IR, ¹H NMR, and mass spectra. Anticancer activities of the compounds selected by the National Cancer Institute were investigated by testing against a panel of 60 different human tumor cell lines derived from nine neoplastic cancer types. Compounds 7, 13, and 23 exhibited reasonable anticancer activity against the screened cancer types with relatively low GI₅₀ values. The compounds showed high activity against melanoma-type cell lines.     

Synthesis and antimicrobial activity of some (3-phenyl-5-(1-phenyl-3-aryl-1H-pyrazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)(pyridin-4-yl)methanones: new derivatives of 1,3,5-trisubstituted pyrazolines

A series of (3-phenyl-5-(1-phenyl-3-aryl-1H-pyrazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)(pyridin-4-yl)methanones was synthesized by condensing suitably substituted chalcones, i.e., 3-(3-aryl-1-phenyl-1H-pyrazol-4-yl)-1-phenylprop-2-en-1-ones, and isoniazid in acetic acid. The structure of newly synthesized compounds has been established on the basis of analytical and spectral data. The new compounds were screened for antimicrobial activity and most of them showed good activity comparable with that of standard drugs ciprofloxacin and fluconazole. Compounds containing methoxy group showed high antimicrobial activity.     

Synthesis and antimycobacterial activities of some new N-acylhydrazone and thiosemicarbazide derivatives of 6-methyl-4,5-dihydropyridazin-3(2H)-one

In this study, twenty-five new 6-methyl-4,5-dihydropyridazin-3(2H)-one derivatives having N-acylhydrazone and thiosemicarbazide moieties were synthesized. The target compounds were tested for their antimycobacterial activity in vitro against Mycobacterium tuberculosis H₃₇R_v using the agar dilution method. Among the synthesized compounds, N′-(2,4-dichlorobenzylidene)-2-(3-methyl-6-oxo-5,6-dihydropyridazin-1(4H)-yl)acetohydrazide 4g was found to be the most active compound with minimum inhibitory concentration of 0.78?μM and was more potent than ethambutol and ciprofloxacin.     

Synthesis and pharmacological evaluation of novel 1-(piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one derivatives as potential antimicrobial agents

Novel compounds of biological interest were synthesized by in situ reduction of Schiff’s base of 5,6-dimethoxy indanone and 1-(piperidin-4-yl)-1H-benzo[d]imidazol-2(3H)-one in the presence of Ti(OiPr)₄ and NaBH₃CN. Further alkylation using different alkyl/aryl halides in the presence of NaH in DMF gave a series of novel compounds. A formation of newly synthesized compounds was confirmed on the basis of their spectral and elemental analysis. Further these compounds were screened for their antimicrobial activity and found to have promising antibacterial and antifungal activity.     

Design,synthesis, docking study and cytotoxic activity evaluation of some novel letrozole analogs

Background

Breast cancer is the most common type of female cancer. One class of hormonal therapy for breast cancer drugs -non steroidal aromatase inhibitors- are triazole analogues. In this work, some derivatives of these drugs was designed and synthesized. All synthesized compounds were evaluated for their cytotoxic activities on breast cancer cell lines (MDA-MB-231, T47D and MCF-7).

Methods

Our synthetic route for designed compounds started from 4-bromotolunitrile which was reacted with 1H-1,2,4-triazole to afford 4-(4-cyanobenzyl)-1,2,4-triazole. The reaction of later compound with aromatic aldehydes led to formation of the designed compounds. Eleven novel derivatives 1a-k were tested for their cytotoxic activities on three human breast cancer cell lines.

Results

Among the synthesized compound, 4-[2-(3-chlorophenyl)-1-(1H-1,2,4-triazol-1-yl)ethenyl]benzonitrile (1c) showed the highest activity against MCF-7 and MDA-MB-231 cell lines and 4-[2-(4-methoxyphenyl)-1-(1H-1,2,4-triazol-1-yl)ethenyl]benzonitrile (1 h) exhibited highest activity against T47D cell line. According to cytotoxic activities results, compound 4-[2-(4-dimethylamino)-1-(1H-1,2,4-triazol-1-yl)ethenyl]benzonitrile (1 k) showed comparative activity against T47D and MDA-MB-231 cell lines with compound (1 h) and our reference drug Etoposide.

Conclusion

In the process of anti-cancer drug discovery, to find new potential anti-breast cancer agents, we designed and synthesized a novel series of letrozole analogs. Cytotoxicity evaluation revealed that compounds (1c) and (1 k) were the most potent compounds with comparative activity with Etoposide. The results revealed that π-π interactions are responsible for the enzyme inhibitions of compounds (1 c) and (1 k).Keyword: Breast cancer, Non-steroidal aromatase inhibitor, Cytotoxic activity     

Synthesis, characterization, and biological evaluation of certain 1,3-thiazolone derivatives bearing pyrazoline moiety as potential anti-breast cancer agents

A series of 5-arylidene-2-(3,5-diaryl-4,5-dihydro-1H-pyrazol-1-yl)-1,3-thiazol-4(5H)-ones were synthesized and screened for their in vitro antitumor activity against human breast adenocarcinoma cell line (MCF-7). Five of the test compounds exhibited good antitumor activity superior to the reference drug, doxorubicin, with IC₅₀ range 1.4–2.3 μM. Among the test compounds, 2-[3,5-bis(4-chlorophenyl)-4,5-dihydro-1H-pyrazol-1-yl]-5-(2-methoxybenzylidene)-1,3-thiazol-4(5H)-one (3i) was found to show the most potent anticancer activity.     

Structure-based design, synthesis, and molecular modeling studies of 1-(benzo[d]thiazol-2-yl)-3-(substituted aryl)urea derivatives as novel anti-Parkinsonian agents

1-(Benzo[d]thiazol-2-yl)-3-(substituted aryl)urea derivatives were designed and synthesized as our efforts to discover novel anti-Parkinsonian agents with improved pharmacological profile in haloperidol-induced catalepsy and oxidative stress in mice. All of the compounds were found to be active in alleviating haloperidol-induced catalepsy in mice. Furfuryl, 2- and/or 3-methoxy substituted phenyl derivatives emerged as potent agents. With exception of 2-chloro,5-trifluoromethyl-substituted analog, halogen-substituted derivatives exhibited moderate anti-Parkinsonian activity. Biochemical estimations of malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px) from brain homogenate were carried out to highlight the neuroprotective properties associated with them. Molecular docking studies of these compounds with adenosine A_2A receptor exhibited very good binding interactions and warrants further studies to confirm their binding with human A_2A receptor for the design and development of potent antagonists. Parameters for Lipinski’s rule of 5 were calculated computationally because pharmacokinetic and metabolic behaviors in the body often are linked to the physical properties of a compound. None of the synthesized compounds violated Lipinski’s rule, making them suitable drug candidate for the treatment of Parkinson’s disease.