新型苯并咪唑类人顶体酶抑制剂的设计、合成及活性研究

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苯并咪唑类衍生物。方法计算机模拟设计及化学合成。结果设计并合成了10个苯并咪唑类化合物,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8a是对照物Nα-对甲苯磺酰-L-赖氨酸氯甲基酮(TLCK)的1426倍。     

3-取代吲哚-2-酮类化合物的设计、合成及抗肿瘤活性研究

目的设计合成对微管蛋白和血管内皮细胞生长因子受体2(VEGFR-2)激酶具有双重抑制作用的3-取代吲哚-2-酮类化合物,考察其体外抑瘤活性。方法以取代的苯胺为起始原料,经缩合、环合、还原、取代等反应制得系列目标化合物,并考察该系列化合物对微管蛋白和肿瘤细胞的抑制活性。结果共合成了11个新的目标化合物。实验结果显示,化合物j9对微管蛋白和VEGFR-2激酶具有双重抑制活性。所有目标化合物对3种肿瘤细胞株均有中等强度的抑制活性。结论该类化合物是一类具有多靶点作用的抗肿瘤化合物。     

新型喹唑啉酮类化合物合成工艺研究

目的 优化取代喹唑啉酮类化合物的合成工艺,重点考察温度、时间2个因素对关键中间体化合物合成的影响。 方法 平行试验比较温度、时间和缩合剂催化酯键的氨解反应,并对试验结果进行整体化分析;采用正交设计的方差分析考察反应物、温度及时间对收率的影响。 结果和结论 所得化合物的结构经过¹H NMR、MS和¹³C NMR等方法确证,当反应温度为30 ℃,反应时间为24 h,缩合剂(DCC)与反应物的投料比为1.5:1时,酯键氨解反应的收率最高(65.41%),使得取代喹唑啉酮类化合物的合成路线更加符合工业生产的要求。体外抗真菌活性实验结果表明,所测定的先导化合物对5种临床致病菌都具有潜在的抗真菌活性,值得进一步研究。     

2,4-二氨基-5-甲基-6-(取代苄基氨基)喹唑啉的合成及其生物活性

根据非经典叶酸拮抗剂氨基喹唑啉类的构效关系和叶酸代谢机理,设计合成了27个2,4-二氨基-5-甲基-6-(取代苄基氨基)喹唑啉(1),其中26个为未知化合物。这类化合物的合成是以邻甲苯胺为原     

一锅法合成新型吲哚-色胺酮类化合物

目的合成新型结构的吲哚-色胺酮[6-(1H-吲哚-2-基)吲哚并[2,1-b]喹唑啉-12(5H)-酮]类化合物,并初步考察其代表性化合物3a的抗肿瘤活性。方法以2-吲哚酮为起始原料,经盐酸酸化后在过量三氯氧磷的条件下与相应的取代2-氨基苯甲酸经一锅法合成新的吲哚-色胺酮类化合物。采用MTT法考察化合物3a对不同肿瘤细胞的抑制作用。结果与结论合成了3个未见报道的新化合物,目标化合物的结构经质谱、核磁共振谱确证。活性测试结果表明,化合物3a对A549肿瘤细胞株显示出一定的抑制作用。目标化合物是在色胺酮结构中引入吲哚单元后形成的新骨架结构的化合物,将为进一步研究基于吲哚-色胺酮结构的先导化合物提供一个新的方向。     

5-氯(氟)-2,4-二氨基-6-(取代苄基氨基)喹唑啉衍生物的合成及其生物活性

根据氨基喹唑啉类化合物抑制叶酸代谢的机理及其构效关系,设计合成了以下三类喹唑啉化合物:Ⅰ,5-氯(氟)-2,4-二氨基-6-(取代苄基氨基)喹唑啉;Ⅱ,5-氯(氟)-2,4-二氨基-6-(N-甲酰-N-取代苄基氨基)-喹唑啉;Ⅲ,5-氯-2,4-二氨基-6-(N-亚硝基-N-取代苄基)氨基喹唑啉。所合成的18个化合物均为未知物,经元素和光谱分析确证其结构。化合物Ⅰ_(1～8)的合成采用5-氯(氟)-2,4, 6-三氨基喹唑啉(8,14)与取代苯甲醛缩合、还原而得,Ⅰ经甲酰化或亚硝化分别得到Ⅱ_(1～6)和Ⅲ_(1～4)。8的合成是将间氯苯胺与三氯乙醛、盐酸羟胺反应,得到的1-(α-肟基乙酰)3-氯苯胺(2)经环合后分除异构体得4-氯靛红(3a),3a经肟化、开环得到2-氨基-6-氯苄腈(5),5再与氰胺环合、硝化、还原即得8。14的合成尚未见报道。我们将5重氮化、氯化,再氟化制得2,6-二氟苄腈(10),10经氨化、环合得     

可逆性胆硷酯酶抑制剂二甲氨基甲酸-5-二氢吲哚酯的合成

为了深入研究催醒宁类化合物的结构与抑酶活性的关系,设计合成了-系列1-,3-或5-位不同取代的二氢吲哚类衍生物(中间体和终产物共24个新化合物)。中间体1,3-二甲基-5-烷氧基-2-二氢吲哚酮(A)的C₃烷化。采用相转移催化方法进行;反应中还分离到三个副产物(Ⅶ～Ⅸ)。初筛结果表明:这些化合物大多有较强的抑酶活性;1,3-或5-位取代基的改变均明显影响其活性。     

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。     

氨基喹唑啉类药物的研究进展

1966年,Davoll等合成了一系列2,4-二氨基-6-取代苄氨基喹唑啉化合物(1),发现PAM 1392(1a)对各种疟原虫均有较强的抑制作用。此后国内外学者围绕2,4-二氨基喹唑啉类化合物进行了大量的结构改造工作,从而发现了一些很有价值的抗疟、抗癌和抗菌有效物,并逐渐揭示了这类化合物的作     

2-咪唑基-戊-1,4-二烯-3-酮类衍生物的合成及其抗菌活性研究

目的设计合成2-咪唑基-戊-1,4-二烯-3-酮类衍生物,并进行抗菌活性测试。方法以不同取代的苯甲醛为起始原料,经过Aldol缩合、溴代、亲核取代和Knoevenagel缩合四步反应合成目标化合物;采用微量稀释法测定化合物最低抑菌浓度(MIC)值。结果合成了30个未见文献报道的新化合物,其结构均经1H-NMR、MS谱测定。结论目标化合物均表现出一定的抗菌活性,可作为先导化合物做进一步改造和修饰。     

Fragment‐Based Design of Novel Quinazolinon Derivatives as Human Acrosin Inhibitors

Human acrosin is a promising target for the male contraceptives. On the basis of the active site of human acrosin, a series of novel quinazolinon compounds were designed by a fragment docking and growing strategy. In vitro anti‐acrosin assay revealed that all the compounds showed potent human acrosin inhibitory activities. In particular, compounds 5c and 5g are more active than the known inhibitors. Molecular docking studies revealed that the quinazolinon inhibitors interacted with human acrosin mainly through hydrogen bonding and hydrophobic interactions. The binding mode was also consistent with the structure–activity relationships. The quinazolinon derivatives in this study can serve as new lead structure for the development of novel male contraceptives.     

An efficient one-pot cyclization of quinoline thiosemicarbazones to quinolines derivatized with 1,3,4-thiadiazole as anticancer and anti-tubercular agents

A series of 6,7,8-substituted thiosemicarbazones (2a–j) of 2-chloro-3-formyl-quinoline derivatives were cyclized to the title compounds (3a–j) using acetic anhydride. The structures of the final compounds (3a–j) were confirmed by elemental and spectral (IR, ¹H NMR and MS) analysis. Some of the title compounds have shown promising anticancer and antitubercular activities.     

Design,synthesis, and evaluation of novel 1-methyl-3-substituted quinazoline-2,4-dione derivatives as antimicrobial agents

A series of novel 1-methyl-3-substituted quinazoline-2,4-dione derivatives was designed, synthesized, and evaluated for their antimicrobial activities against six strains of bacteria and five fungi in vitro. The synthesized compounds were characterized by spectral methods. The bioactive assays showed that most of the compounds exhibited moderate antimicrobial activities against the tested strains.     

Synthesis and In Vitro Antioxidant Activity of New 3-Substituted-2-Oxindole Derivatives

A series of new 1,3-dihydro-3-hydroxy-3-(2-phenyl-2-oxoethyl)-2H-indol-2-ones (1a-g) and 1,3-dihydro-3-(2-phenyl-2-oxoethylidene)-2H-indol-2-ones (2a-g) were synthesised by Knoevenagel condensation of substituted indole-2,3-diones (isatins) with various acetophenones. The synthesised compounds were characterised by their physical data, elemental, IR, ¹H NMR, ¹³C NMR and mass spectral analyses and their in vitro antioxidant activity was determined by 2,2-diphenyl-1-picrylhydrazyl free radical scavenging assay. These compounds showed moderate to good antioxidant activities as compared with the standard, ascorbic acid. The antioxidant potential of 3-hydroxy-3-substituted oxindoles (1a-g) increased in a concentration-dependent manner from 10 to 500 μg/ml with 5-fluoro and 5-methyl analogues showing maximum activity. Of 3-aroyl methylene indol-2-ones (2a-g), majority of compounds with halogen substitution at position 5 of isatin ring exhibited good antioxidant activity within a concentration range of 5-100 μg/ml and the maximum activity was observed at 20 and 25 μg/ml concentrations. Thus, our study provides evidence that some newly synthesised isatin derivatives exhibit substantial antioxidant activity at low concentrations.     

Synthesis and antibacterial evaluation of 6-azapyrimidines with α-methylene-γ-(4-substituted phenyl)-γ-butyrolactone pharmacophores

Abstract  

A series of 6-substituted 2-[(4-methylene-5-oxo-2-(4-substituted phenyl) tetrahydrofuran-2-yl)methyl]-1,2,4-triazine-3,5(2H,4H)-diones (5, 6) and 2,4-bis[(4-methylene-5-oxo-2-(4-substituted phenyl) tetrahydrofuran-2-yl)methyl]-1,2,4-triazine-3,5(2H,4H)-diones (9, 10) were designed, synthesized, and evaluated for antibacterial activity against Gram-positive and Gram-negative microorganisms. The synthesis of these compounds involved the Reformatsky-type reaction between ethyl α-(bromomethyl)acrylate and the proper ketones. Among these compounds, 2-[(4-methylene-5-oxo-2-phenyl tetrahydrofuran-2-yl)methyl]-1,2,4-triazine-3,5(2H,4H)-dione (5a) is the most active compound and shown the selective inhibition activity against Proteus vulgaris.     

Synthesis of new series of pyrazolo[4,3-d]pyrimidin-7-ones and pyrido[2,3-d]pyrimidin-4-ones for their bacterial and cyclin-dependent kinases (CDKs) inhibitory activities

Two series of pyrazolo[4,3-d]pyrimidin-7-ones and pyrido[2,3-d]pyrimidin-4-ones were designed, synthesised, and evaluated for their antibacterial activities and CDKs inhibitory activities. The pyridazine derivative: 6-phenyl-5-phenylhydrazono-2,3,4,5-tetrahydropyridazine-3,4-dione (3a) revealed activity against Staphylococcus aureus as Gram-positive bacteria while compound 2-(2-Ethoxyphenyl-5-Phenylpiperazinosulfonamido)-3H-pyrido[2,3-d]pyrimidin-4-one (13c) was showing moderate antifungal activity against Candida albicans.     

Synthesis and Antimicrobial Activities of Some New Azetidin-2-ones and Thiazolidin-4-ones

Various (4-substituted) phenyl-3-β-[(N-benzenesulphonyl/tosyl)-4-(un)substituted anilino]propionylamido-1,3-thiazolidine-4-ones (3a-x) and 1-β-[(N-benzenesulphonyl/tosyl)-4-(un)substituted anilino]-propionylamido-3-chloro-4-(4-substituted)phenyl-azetidin-2-ones (4a-x) have been synthesised by the cyclocondensation of Schiff bases (2a-x) with thioglycolic acid and chloroacetyl chloride, respectively. The structures of the newly synthesised compounds have been established on the basis of their spectral data and elemental analysis. All compounds were evaluated for antimicrobial activities against Escherichia coli, Bacillus cirroflagellosus, Aspergillus niger and Colletotrichum capsici. Most compounds investigated exhibited significant antifungal activity against Colletotrichum capsici, comparable to that of fluconazole, the standard used.     

雌三醇11位取代物的合成

为了寻找新的雌激素类药物,合成了(11),(14a)～(14d)等五个雌三醇的11位取代物(11α-OH,11β-OH,11α-OCH₃,11β-OCH₃,11β-OAc)供药理筛选。化合物的制备采用了新的合成路线;对△⁹⁽¹¹⁾-雌酚酮缩酮物(3)及11位取代雌酚酮烯醇酯化合物(10a),(10b)的硼氢化反应进行了考察,分离得到了9α-羟基物(5)及11位取代的16表雌三醇(13a)、(13b)等副产物。所有化合物的结构均通过光谱解析和化学转换得以确证。