[1,2,4]三氮唑并[1,5-a]嘧啶类化合物的合成及其抗肿瘤活性

目的寻找具有抗肿瘤活性的新化合物,设计合成[1,2,4]三氮唑并[1,5-a]嘧啶衍生物,并评价其体外抗肿瘤活性。方法以γ-丁内酯为起始原料,经环合、氯代、取代、硫醚化和氨甲基化等反应合成7-苯基氨基-2-[3-(5-取代氨基甲基-呋喃-2-基-甲硫基)丙基]-5-甲基-[1,2,4]三氮唑并[1,5-a]嘧啶类化合物。采用MTT法,以顺铂为阳性对照药,以Bel-7402和HT-1080为测试细胞株对目标化合物的抗肿瘤活性进行了评价。结果与结论合成了12个未见文献报道的新化合物,结构经质谱、红外光谱和核磁共振氢谱确证。体外活性实验表明:化合物16显示出很好的抗肿瘤活性。     

氮唑取代苯基醚类衍生物的合成及其抗真菌活性

通过取代溴苄与１－（２，４－二取代苯基）－２－（１Ｈ－吲哚和苯并咪唑－１－基）乙醇反应，合成了一系列１－｛２－「（取代苯基）甲基」－２－（取代苯基）乙基－１－吲哚和苯并咪唑类新化合物，并用二倍体稀释法对化合物进行了体外抗真菌试验。     

1,2,3-三氮唑并[4,5-d]嘧啶酮三环类衍生物的合成及抗肿瘤活性研究

目的 设计合成天然产物deoxyvasicinone和mackinazolinone类似物1,2,3-三氮唑并[4,5-d]嘧啶酮三环系列化合物,以期发现具有抗肿瘤活性的化合物.方法 采用商业易得的苯胺为起始原料,通过重氮化、[3+2]环加成、催化环化等步骤合成了27个结构新颖的三环类化合物;采用MTT法(以阿霉素作为...     

4H-吡啶并[1,2-a]嘧啶-4-酮取代的双芳基脲类化合物的合成及抗增殖活性

目的设计合成4H-吡啶并[1,2-a]嘧啶-4-酮取代的双芳基脲类化合物,初步评价其体外抗增殖活性。方法以2-氨基吡啶或2-氨基-4-甲基吡啶为原料,经环合、烃化、还原及酰化共4步反应合成目标化合物;以sorafenib为阳性对照,采用MTT法,测试目标化合物对乳腺癌细胞株MDA-MB-231的抗增殖活性。结果与结论合成了16个未见报道的含4H-吡啶并[1,2-a]嘧啶-4-酮药效团的双芳基脲类化合物,其结构经1H-NMR和MS确证;8个化合物显示较好的体外活性,其中,化合物4h活性突出,为sorafenib的8.3倍。     

4-氨基-7-硝基苯并[1,2,5]噁二唑的合成

以2，6－二氯苯胺为原料，通过氧化环化、硝化、叠氮化、氨化等5步反应，得到4－氨基－7－硝基苯并[1,2,5]恶二唑，并对反应条件、精制方法进行了改进。总收率20．1％。     

四氢吡啶并[1,2-a]吲哚类化合物的合成及其扩张脑血管活性

本文报道了7个2-取代-6-氧代-10-[2-(N-取代)氨甲酰基]乙基-6,7,8,9-四氢吡啶并[1,2-a]吲哚类化合物的合成。初步药理试验表明,设计合成的化合物均有一定程度的扩张脑血管作用,其中化合物Ⅰ₇的作用最为明显。构效关系显示酰胺结构中二乙氨基乙胺的作用强于二甲氨基乙胺。     

超声-微波辐射法合成5-氯苯并三氮唑衍生物

摘 要 目的： 采用超声-微波辐射法合成新的5-氯苯并三氮唑衍生物,并对其结构进行表征。方法: 以5 氯苯并三氮唑为起始原料,与氯乙腈合成中间体,再分别与6-氯烟醛和5-甲醛-2-甲氧基吡啶合成相应的目标产物。结果:合成得到6个新的5 氯苯并三氮唑衍生物,通过测定熔点、IR、LC-MS和¹H-NMR确认其结构。结论: 用超声 微波辐射法合成得到6个5-氯苯并三氮唑衍生物。     

5,7-二取代吡唑并[1,5-a]嘧啶类化合物的合成及其抗肿瘤活性

目的设计并合成吡唑并[1,5-a]嘧啶类化合物,并评价其抗肿瘤活性。方法根据吡唑并[1,5-a]嘧啶类抗肿瘤药物的基本结构,设计了14个5-胺甲基-7-苯胺基吡唑并[1,5-a]嘧啶类化合物,并以丙二腈和原甲酸三乙酯为起始原料,经5步反应得到目标产物。采用MTT法,顺铂为阳性对照药,以Bel-7402和HT-1080为测试细胞株对目标化合物进行抗肿瘤活性评价。结果与结论合成了14个未见文献报道的新化合物,结构经MS、IR和1H-NMR确证。体外活性实验表明:化合物12显示出较好的抗癌活性。     

2-取代-4-氨基噻吩并[3,2-d]嘧啶类化合物的合成及抗增殖活性

目的设计并合成2-取代-4-氨基噻吩并[3,2-d]嘧啶类化合物,评价其体外抗增殖活性。方法以3-氨基-2-噻吩甲酸甲酯为起始原料,经6步反应合成目标化合物;以CP-31398为阳性对照药,采用MTT[3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide]法测定了目标化合物对肿瘤细胞株H-460和HT-29的抗增殖活性。结果与结论合成16个未见文献报道的化合物,其结构经1H-NMR、MS确证;5个化合物显示较好的抗增殖活性,其中,化合物8n活性突出,为CP-31398的4-5倍。     

2-芳基咪唑并[1,2-a]吡啶-3-乙酰胺衍生物的合成与抗焦虑活性研究

目的寻找水溶性较好、抗焦虑活性较强的新型化合物。方法设计合成2-芳基咪唑并[1,2-a]吡啶-3-乙酰胺类化合物,通过体外苯二氮受体竞争结合实验及小鼠高架迷宫行为实验,评价化合物的体内外抗焦虑活性,分析化合物的构效关系。结果与结论共合成28个新型化合物,通过1H-NMR和MS确证其结构,其中I8和I10水溶性良好。苯二氮受体竞争结合实验结果表明,化合物Ⅰ1、Ⅰ8、Ⅰ10、Ⅰ13、Ⅰ19与苯二氮受体的亲和力与阳性对照药物Ro5-4864相当,在浓度为100nmol/L时,其对放射性配体与受体结合的抑制率分别为87%、89%、85%、89%和76%,而Ro5-4864为82%。对水溶性及活性均较好的化合物Ⅰ和Ⅰ进行小鼠抗焦虑活性评价结果表明,其具有明显的体内抗焦虑作用。     

Reactions with 3-amino-1,2,4-triazole: Synthesis of several new 1,2,4-triazolo[5,1-a]pyrimidine derivatives

Several new 1,2,4-triazolo[5,1-a]pyrimidine derivatives were synthesized via the reactions of 3-amino-1,2,4-triazole with active methylene nitriles and thier ylidene derivatives. The structures assigned for the reaction products were based on elemental analyses and spectral data.     

Synthesis and antifungal activity of 2-aryl-1,2,4-triazolo[1,5-a]pyridine derivatives

A series of novel antifungal triazole derivatives 2-aryl-1,2,4-triazolo[1,5-a]pyridine 9a-m were synthesized and tested in vitro for their growth inhibitory activities against C. albicans and T. rubrum. The MIC values indicate that the activities of three compounds were superior or comparable to fluconazole against both tested fungi, worthy of further investigation of its antifungal activities.     

Synthesis and antimicrobial activity of certain new 1,2,4-triazolo[1,5-a]pyrimidine derivatives

Certain new derivatives of 1,2,4-triazolo[1,5-a]pyrimidines were synthesized through the reaction of 1,2,4-triazolo[1,5-a]pyrimidine-7-ol with ethyl bromoacetate to afford the ethyl acetate ester, which upon hydrazinolysis gives the corresponding hydrazide. The hydrazide is the key intermediate which was used for the synthesis of the target compounds. The structures of the new compounds were assigned by spectral and elemental methods of analyses. The synthesized compounds were tested for their in vitro antibacterial and antifungal activities. Most of the tested compounds showed comparable results with those of ampicillin and fluconazole reference drugs.     

Tricyclic Heteroaromatic Systems. 1,2,4-Triazolo[4,3-a]quinoxalines and 1,2,4-Triazino[4,3-a]quinoxalines: Synthesis and Central Benzodiazepine Receptor Activity

Some 1,2,4-triazolo[4,3-a]quinoxalines 1–10 , and 1,2,4-triazino[4,3-a]quinoxalines 11–12 were prepared and biologically evaluated for their binding at the benzodiazepine receptor (BZR) in rat cortical membranes. The BZR affinity of 1–10 demonstrates that the presence of a proton acceptor at position-1 is important for the potency of a BZR ligand. On the other hand, the BZR inactivity of the 1,2,5-trione derivatives 11–12 shows that the right collocation of the essential L₂ lipophilic substituent is of paramount importance for receptor-ligand interaction.     

Synthesis and in vitro antibacterial evaluation of novel imidazo[2',1':5,1]-1,2,4-triazolo[4,3-c]-quinazoline derivatives of 5-thioxo-1, 2, 4-triazole, 4-oxothiazolidine, and their open-chain counterparts

Two novel series of imidazo[2', 1':5, 1]-1, 2, 4-triazolo[4, 3-c]quinazolines bearing 5-thioxo-1, 2, 4-triazoles, 6a-f, and 4-oxothiazolidines, 7a-f, were synthesized from corresponding thiosemicarbazide derivatives, 5a-f. The stepwise methodology applied to the preparation of compounds 5a-f was initiated with reaction of the parent 3-amino-1, 2, 4-triazolo[4, 3-c]quinazolines, 2, with ethyl 2-chloroacetoacetate resulting in annelation of the imidazole ring to give esters, 3a-c. However, hydrazinolysis of these ester derivatives gave the corresponding acid hydrazides, 4a-c, which on reaction with the appropriate alkyl isothiocyanate yielded compounds 5a-f. In turn, compounds 5, were cyclized with potassium hydroxide or with ethyl bromoacetate to give the corresponding thioxotriazoles 6 and oxothiazolidines 7, respectively. All synthesized compounds were screened for their in vitro antibacterial activity against various Gram-positive and Gram-negative bacteria. Some test compounds were found to possess potent antibacterial activities. Compound, 7f, exhibited much higher potency than the reference standard ciprofloxacin, against both types of bacteria, particularly, Gram-positive organisms.     

Synthesis of several new isoxazole,imidazo[1,2-a]pyridine,imidazo[1,2-a]pyrimidine,benzoxadiazine and benzothiazine derivatives from hydroximoyl halides

Furoylhydroximoyl chloride3 reacted with 2-aminopyridine, 2-aminopyrimidine,O-aminophenol,O-phenylenediamine and aminothiophenol to afford imidazo[1,2-a]pyridine6, imidazo[1,2-a]pyrimidine8, benzoxadiazine10, nitrosobenzopyrazine13a and nitrosobenzothiazine13b, respectively. Isoxazoline18 and pyrrolidino[3,4-d]isoxazolin-4,6-dione derivatives19a and19b obtained by the reaction of3 with acrylonitrile and N-arylmaleimide. Hydroximoyl chloride3 reacted with thiophenol and sodium benzenesulfinate to yield furylglyoxaloxime16a and16b, respectively. Hydroximoyl chloride3 reacted also with some active methylene compound to give isoxazole derivatives20–23, respectively.     

Synthesis of novel 4,5-dihydropyrrolo[1,2-a]quinoxalines,pyrrolo[1,2-a]quinoxalin]-2-ones and their antituberculosis and anticancer activity

A facile strategy was developed for the synthesis of biologically important 4,5-dihydropyrrolo[1,2-a]quinoxalines and pyrrolo[1,2-a]quinoxalin]-2-ones by treating 2-(1H-pyrrol-1-yl)anilines with imidazo[1,2-a]pyridine-3-carbaldehyde or isatin, using amidosulfonic acid (NH₃SO₃) as a solid catalyst in water at room temperature. The protocol has been extended to electrophile ninhydrin. The catalyst could be recycled for six times without the loss of activity. The compounds were evaluated for their antituberculosis, antibacterial, and anticancer activities. It is worth noting that compounds 3d and 3e demonstrated a minimum inhibitory concentration value of 6.25 µM against Mycobacterium tuberculosis H37Rv, whereas compounds 3d , 3g , 5d , 5e , and 5i showed a remarkable inhibition of A549, DU145, HeLa, HepG2, MCF-7, and B16-F10 cell lines, respectively. Staphylococcus aureus was inhibited by compounds 5b , 5e , 5d , 5g , and 5l at 32 µg/ml.     

3-三氟甲基-4-氨基-5-巯基-1,2,4-三唑衍生物的合成及其抗真菌活性研究

目的合成3-三氟甲基-4-氨基-5-巯基-1,2,4-三唑衍生物并对其进行抗真菌活性研究。方法以3-三氟甲基-4-氨基-5-巯基-1,2,4-三唑(Ⅰ)为起始原料,与卤苄在无水乙醇中回流制得中间体3-三氟甲基-4-氨基-5-(取代)苄硫基-1,2,4-三唑(Ⅱ),Ⅱ与2,4-二氯苯甲醛反应得目标物3-三氟甲基-5-(取代)苄硫基-1,2,4-三唑希夫碱Sch iff,s(Ⅲ)。对中间体Ⅰ、Ⅱ和目标物Ⅲ进行了体外抑菌活性测试。结果合成了9个新的目标物Ⅲ,用1H-NMR和元素分析确定了中间体Ⅱ和目标物Ⅲ的结构。初步体外抑菌实验表明:3-三氟甲基-4-氨基-5-巯基-1,2,4-三唑衍生物对常见深部致病真菌有一定的体外抑制活性,但均弱于对照品氟康唑、特比萘芬和伊曲康唑。结论合成的目标物Ⅲ衍生物对常见深部致病真菌有一定的活性,对浅部真菌的活性有待进一步研究。     

5-羟基-5H-[1]-苯并吡喃[2,3-b]吡啶的制备

目的改进5-羟基-5H-[1]-苯并吡喃[2,3-b]吡啶的合成工艺。方法以2-氯烟酸为起始原料,经亲核取代、环合和还原制得目标化合物。结果总收率68.6%,产物经熔点和1HNMR确证。结论改进后的工艺具有操作简便,对环境友好,收率高等优点。