二氢青蒿素和11－羟基二氢青蒿素的酯类衍生物的合成

为寻找抗疟活性更高和化学性质更稳定的青蒿素衍生物，合成了７个二氢青蒿素和１１－羟基二氢青蒿素的酯类衍生物并进行了鼠疟筛选。（４ａ）和（４ｂ）的抗疟活性与青蒿素相当，而５ａ－５ｅ则远不如青蒿素本身。这一实验结果说明１１－羟基的引入导致抗疟活性的下降，经长期的稳定性观察，发现这些酯类衍生物中大体积取代基团的存在有利于它们的稳定。     

甘草次酸3位酯类衍生物的合成及其抗炎活性的研究

目的 研究甘草次酸3位酯类衍生物的合成及其抗炎活性.方法 以甘草次酸为原料,结合甘草次酸的构效关系,采用化学方法合成了氨基酸类化合物或咪唑杂环类化合物与甘草次酸结构单元构筑的N-乙酰氨基乙酸甘草次酸酯、N-乙酰-DL-α-氨基丙酸甘草次酸酯、N-乙酰-DL-蛋氨酸甘草次酸酯、咪唑-4-羧酸-5-甘草次酸酯和咪唑-4-羧酸-5-(11-脱氧甘草次酸)酯等5种甘草次酸3位酯类衍生物,并经IR、1HNMR、MS等确证其结构.以二甲苯引起的小鼠耳肿胀模型评价其抗炎活性.结果 所合成的衍生物对二甲苯致小鼠耳肿胀具有明显的抑制作用.结论 甘草次酸3位酯类衍生物具有明显的抗炎活性,抗炎活性接近于氢化可的松,部分化合物的抗炎活性高于氢化可的松.     

二氢青蒿素和11—羟基二氢青蒿素的酯类衍生物的合成

为寻找抗疟活性更高和化学性质更稳定的青蒿素衍生物，合成了７个二氢青蒿素和１１－羟基二氢青蒿素的酯类衍生物并进行了鼠疟筛选，（４ａ）和（４ｂ）的抗疟活性与青蒿素相当，而５ａ－５ｅ则远不如青蒿素本身，这一实验结果表明１１－羟基的引入导致抗疟活性的下降，经长期的稳定性观察，发现这些酯类衍生物中大体职取代基团的存在有利于它们的稳定。     

新型三唑类衍生物的合成及其抗真菌活性研究

目的：研究具有萘苄结构的三唑醇类化合物的抗真菌活性。方法设计合成了9个目标化合物;其结构通过1 H NMR、MS确证,选择8种真菌为实验菌株,根据美国国家临床实验室标准委员会（NCCLS）推荐的标准化抗真菌敏感性实验方法,进行体外抑菌活性测试。结果所有化合物对所选真菌均表现出了一定的抑菌活性,化合物1c对除烟曲霉菌以外的其他7种真菌的MIC80值＜0．125μg/ml,是伏立康唑活性的16倍。结论引入萘环和烃基侧链的目标化合物都有抗真菌活性。     

新型三唑类衍生物的合成及抗真菌活性研究

目的:研究具有萘苄结构的三唑类化合物的抗真菌活性.方法:设计合成了10个三唑类新化合物,其结构通过1H-NMR、MS确证,选择8种真菌为实验菌株,进行体外抑菌活性测试.结果:所有化合物对所选真菌均表现出了一定的抑菌活性,部分化合物对白念珠菌的MIC80值＜0.125μg/ml,是伏立康唑活性的16倍.结论:引入萘环和烷基侧链的目标化合物都具有抗真菌活性.     

异黄酮哌嗪衍生物的合成

异黄酮类化合物广泛存在于植物中 ,具有多种生理活性 .以苯乙酸和间苯二酚为原料 ,合成了 9个异黄酮哌嗪衍生物 ,均未见文献报道 .其结构经过IR ,MS和1H NMR确证 .     

Deaminomartefragin A及其衍生物的合成与生物活性(Ⅰ)

目的设计合成deaminomartefragin A及其衍生物并测定其自由基清除、单胺氧化酶抑制和抗肿瘤活性.方法以天然的2-甲基丁醇为原料制备光学活性的4-甲基己酸;以丙二酸二乙酯为原料制备外消旋的2-甲基丁酸.再以易得的色氨酸为原料,与上述4-甲基己酸、2-甲基丁酸以及不同取代的苯甲酸分别在DCC催化脱水下缩合得到相应的酰胺,通过苄位氧化和分子内环合得到deaminomartefragin A及其侧链不同的衍生物.并对其生物合成前体酰胺进行分离纯化研究.结果合成了deaminomartefragin A及其衍生物,包括其生物合成前体在内共合成14个新化合物,其结构经光谱学测定确证,并对目标化合物进行了3种生物活性的筛选.结论初步的体外生物实验结果表明:deaminomartefragin A(16)和化合物17,18具有较强的自由基清除活性,其活性与维生素E相当.化合物6,7,11,12,14,15具有一定的抗肿瘤活性,化合物14,15,19有一定的单胺氧化酶抑制活性.     

黄酮衍生物的合成及其抗炎活性研究

目的 设计合成一系列黄酮衍生物,并考察其抗炎活性。方法 采用Baker-Venkataraman反应合成单羟基取代的黄酮,进而经Williamson反应合成黄酮衍生物;以布洛芬为阳性对照药,采用巴豆油致小鼠耳肿胀实验对5个目标化合物（1a、1c、1d、2a、2c）的抗炎活性进行了评价。结果与结论 以2’,5’-二羟基苯乙酮或2’,4’-二羟基苯乙酮为原料,合成了12个未见文献报道的新化合物,其结构经核磁共振氢谱、高分辨质谱及红外光谱确证。初步的药理筛选结果表明化合物6-[2-(4-吗啉基)乙氧基]黄酮(1a)和2’-氟-7-(2-二甲氨基甲酰甲氧基)黄酮(2c)具有潜在的抗炎活性。     

沙蟾毒精酯类衍生物的合成和抗肿瘤活性研究

目的 基于活性天然产物沙蟾毒精骨架设计3-酯类衍生物,并测试其抗肿瘤活性.方法 通过缩合剂催化下将酸和沙蟾毒精进行酯化反应,得到3-酯类沙蟾毒精衍生物,采用Cell Titer法测试体外抗肿瘤活性.结果 3-沙蟾毒精酯类衍生物对所有的肿瘤细胞株显示出优异的体外抗肿瘤活性,其IC50值均在1μmol/L以下.结论 化合物...     

黄芩苷衍生物的合成及其生物活性研究

目的为改善黄芩苷的溶解性,设计合成系列黄芩苷衍生物,并评价其抗脂质过氧化活性和抗肿瘤活性。方法以黄芩苷和环氧乙(丙)烷为原料,通过羟乙基化、羟丙基化、酯化反应合成了一系列黄芩苷衍生物;分别采用生化法和台盼蓝染色法测试目标化合物对小鼠脑脂质过氧化产物丙二醛(MDA)的体外抑制作用及对白血病细胞HL-60的生长抑制活性。结果合成了13个黄芩苷衍生物,其结构经1H-NMR和MS确证。其中,化合物3⁶、116、11¹3为未见文献报道的新化合物。化合物1、6对MDA的抑制作用显著,化合物713为未见文献报道的新化合物。化合物1、6对MDA的抑制作用显著,化合物7¹0、12具有中等强度的抑制HL-60生长作用。结论黄芩苷结构中的酚羟基是其抑制脂质过氧化产物MDA的活性基团,葡萄糖醛酸的6位游离羧基是能够增强化合物抗肿瘤活性的有效基团。     

Synthesis and biological evaluation of ester derivatives of indomethacin as selective COX-2 inhibitors

The ester derivatives of indomethacin were prepared by condensing indomethacin with an equimolar quantity of an appropriate alcoholic compound in anhydrous dichloromethane in the presence of DCC and DMAP. Spectral studies comprising of IR, ¹H NMR, mass, and microanalysis were performed in order to confirm their structures. In vivo anti-inflammatory studies were carried out using carrageenan rat paw edema method and in vivo ulcerogenic studies by ulcer index method for the panel of synthesized compounds. Out of eleven compounds, the compound IIc displayed moderate anti-inflammatory activity with no observable ulcerogenic effect when compared to indomethacin. Furthermore, compound IIc, indomethacin and celecoxib were tested at a concentration of 20?μM against COX-1 and COX-2 enzymes by colorimetric COX inhibitor screening assay. Compound IIc was found to be active against COX-2 and COX-1 enzymes exhibiting 62.0 and 12.9% inhibition, respectively.     

Synthesis and biological evaluation of phenylpropanoid derivatives

In this work, a series of oxime ether phenylpropanoid derivatives were synthesized. Their anti-hepatitis B virus (HBV) activity in HepG 2.2.15 cells was determined, and anti-cancer potential against three human cancer cell lines was evaluated. All the synthesized derivatives showed great efficiency against HBV. Compound 4d demonstrated the most effective anti-HBV activity, performing strong potent inhibitory not only on the secretion of HBsAg (IC₅₀ = 50.45 μM, SI = 9.18) and HBeAg (IC₅₀ = 50.11 μM, SI = 9.24), but also on the HBV DNA replication (IC₅₀ = 51.80 μM, SI = 8.94). Besides, the synthetic compounds also displayed obvious anti-cancer activity. Moreover, the docking study of all synthesized compounds inside the related protein active site was conducted to explore the molecular interactions and a molecular target for activity using a MOE-docking technique. This study identified a new class of potent anti-HBV and anti-cancer agents.     

Synthesis and biological evaluation of cytogenin derivatives

To enhance the stability in vivo, new derivatives of cytogenin were synthesized, and their biological activity and stability in mice were estimated. 2-(8-Hydroxy-6-methoxy-1-oxo-1H-2-benzopyran-3-yl)propionic acid (NM-3) was found to be the most stable among them. It modified collagen-induced arthritis in mice. It also showed potent anti-angiogenic activity in a mouse dorsal air sac assay.     

Synthesis and biological evaluation of 16 beta-pyrrolidinosteroidal derivatives

The synthesis of some steroidal bisquaternary ammonium substances (compounds 10 and 11), and their in vitro and in vivo neuromuscular blocking action are described in this report. The pyrrolidino functionality was incorporated at both the 3-beta and 16-beta positions of the steroid nucleus to study the importance of the interonium distance between the two quaternary ammonium heads. The 16-beta-pyrrolidino monoquaternary derivatives (compounds 14, 15, 16) were also prepared. The 17-beta-acetoxy bisquaternary derivative compound 11 was found to be more potent than d-tubocurarine (CAS 57-94-3) in in vivo studies. The 17-beta-hydroxy bisquaternary derivative, compound 10, and its 16-beta-pyrrolidino monoquaternary partner, compound 15, were found to be less active as compared to d-tubocurarine in in vitro studies. The monoquaternary compounds 14 and 16 were not tested due to their solubility problems. The intermediate substance, compound 12 was selected by the National Cancer Institute (NCI), Bethesda (USA) for investigation for antineoplastic activity but was found to be inactive.     

Sorafenib硫脲衍生物的合成及活性研究

在已上市的多靶点小分子靶向抗肿瘤药sorafenib的基础上,设计合成了16个4-[4-(2-甲胺酰基吡啶)]氧苯基芳香硫脲衍生物。16个目标化合物的结构经1H NMR、MS及元素分析确证。采用四氮唑盐(MTT)法测试了所合成化合物的体外抗肿瘤活性,结果表明所合成的化合物均具有一定的抗肿瘤活性,其中化合物1a、1d、1i及1j的抗肿瘤活性优于或相当于阳性对照sorafenib。     

Synthesis and biological evaluation of some stilbene derivatives

Several trans and cis stilbenes with substitution on the olefinic bridge were synthesized and characterized by IR, NMR and mass spectroscopy in an effort to obtain substances that could be more readily formulated. All the synthesized compounds were screened against Molt4/C8, CEM and L1210 cell lines. None of these compounds were endowed with pronounced cytostatic activity. However, Schiff derivatives emerged as cytostatic agents (IC₅₀: 0.77–10 μg/ml) that deserve further investigation.     

Synthesis and biological evaluation of antitumor-active arglabin derivatives

Arglabin derivatives varied at the endo- or exo-cyclic double bond were synthesized and studied in a colorimetric sulforhodamine B assay for their cytotoxicity. Variations on the endocyclic double bond led to compounds of reduced cytotoxicity whereas derivatives from the reaction of the α-methylene-γ-butyrolactone moiety led to compounds of similar or only slightly reduced cytotoxicity but different, cell line-dependent selectivity. In addition, arglabin is an excellent starting material for the synthesis of the guaianolide arborescin.     

Synthesis and evaluation of biological properties of benzylideneacetophenone derivatives

A series of yakuchinone B 1f and its analogs 1a-e was synthesized and evaluated for free radical scavenging, suppression of LPS-induced NO generation, cytotoxicity and anti-excitotoxicity in vitro. Compound 1c exhibited potent anti-excitotoxicity, while all compounds 1a-f showed considerable effects of free radical scavenging, suppression of LPS-induced NO generation, and cytotoxicity in microglia.     

Synthesis,characterization and biological evaluation of dihydropyrimidine derivatives

A series of dihydropyrimidines containing quinoline were prepared under conventional heating and microwave irradiation. The structures of newly synthesized compounds were established based on analytical and spectral studies. Further these compounds were evaluated for their antioxidant, antifungal and antibacterial activities. Most of the compounds showed moderate to good activity when compared with standard.