吡唑并[1,5-a]嘧啶类化合物的合成及其抗肿瘤活性

目的 设计合成新的吡唑并[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一系列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,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评价.结果与结论 合成了11个未见文献报道的化合物,结构经质谱和核磁共振氢谱确证.化合物6显示出很好的抗肿瘤活性.     

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。     

吡唑并[1，5-α]嘧啶类化合物的合成及其抗肿瘤活性

目的设计合成新的吡唑并[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一系列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,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评价。结果与结论合成了11个未见文献报道的化合物,结构经质谱和核磁共振氢谱确证。化合物6显示出很好的抗肿瘤活性。     

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...     

7-芳胺基-3-氰基-5-烷基吡唑并[1,5-a]嘧啶类化合物的合成

目的 设计并合成7-芳胺基-3-氰基-5-烷基吡唑并[1,5-a]嘧啶类化合物,初步评价其药理活性.方法 以丙二腈和原甲酸三乙酯为起始原料,通过新的合成路线制备了目标化合物;采用MTT法测定目标化合物的细胞毒性.结果 与结论合成了13个新化合物,其结构经1H-NMR、MS确证,7个化合物显示出不同程度的细胞毒性,化合物8a、8f、8g的活性较好,有进一步研究的价值.     

7-芳胺基-3-氰基-5-烷基吡唑并[1,5-a]嘧啶类化合物的合成及药理活性

目的设计并合成7-芳胺基-3-氰基-5-烷基吡唑并[1,5-a]嘧啶类化合物,初步评价其药理活性。方法以丙二腈和原甲酸三乙酯为起始原料,通过新的合成路线制备了目标化合物;采用MTT法测定目标化合物的细胞毒性。结果与结论合成了13个新化合物,其结构经1H-NMR、MS确证,7个化合物显示出不同程度的细胞毒性,化合物8a、8f、8g的活性较好,有进一步研究的价值。     

5,7-二取代吡唑并[1,5-α]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-α]嘧啶类化合物，并评价其抗肿瘤活性。方法根据吡唑并[1，5-α]嘧啶类抗肿瘤药物的基本结构，设计了14个5-胺甲基一7一苯胺基吡唑并[1，5-α]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。     

多取代三氮唑类化合物的合成及其抗肿瘤活性研究

目的设计合成一系列4-胺甲酰-1,5-双芳基-1,2,3-三氮唑类化合物,并评价其抗肿瘤活性。方法以叠氮化钠为原料,经亲核取代反应制成有机叠氮化物后与丙炔酸甲酯通过Huisgen 1,3-偶极环加成反应得到5-碘代-1,2,3-三氮唑,再与单质硫和苄溴类化合物经3步连续反应"一锅法"得到1-对甲氧基苄基-4-甲氧甲酰-5-苄基硫醚-1,2,3-三氮唑,对三氮唑环上的4-甲氧甲酰基进行胺解反应得到目标化合物。采用MTT法测定目标化合物对人乳腺癌细胞(MCF-7)、肝癌细胞(Hep G2)、肺癌细胞(A549)和宫颈癌细胞(He La)的抑制活性。结果与结论合成了15个未见报道的4-胺甲酰-1,5-双芳基-1,2,3-三氮唑类化合物,其结构经1H-NMR、13C-NMR及HR-MS谱确证。其中,化合物7a对Hep G2、A549和He La细胞均表现出中等程度的抑制活性(IC50值分别为23.00、33.88、26.66μmol·L-1),有进一步研究的价值。     

作用于神经系统药物:吡啶并[1,2-a]嘧啶酮系列化合物的合成

加锡果宁(Ⅰ)是中药野花椒的成分之一,具有较强的镇痛作用和中枢抑制作用。为寻找低毒高效的类似物,我们曾对其进行结构改造,设计合成了系列化合物并进行了药理试验。前文报道的是在母核芳环上引入不同取代基而不改变母核结构,本文进一步对不同母核的类似物进行了合成及药理研究。     

2-取代苯基-1,2,4-三氮唑[5,1-a]并吡啶类衍生物的合成及其溶黄体活性

目的研究2－取代苯基－1，2，4－三氮唑[5,1-a]并吡啶类衍生物的合成及其抗早孕活性。方法 甲基取代吡啶胺化后，通过和取代苯甲腈缩合反应合成目标化合物，利用离体培养大鼠黄体细胞试验进行抗早孕活性筛选。结果 设计合成了14个未见文献报道的2－取代苯基－1，2，4－三氮唑[5,1-a]并唑啶类衍生物，均为新化合物。生物活性实验结果表明：除化合物7k以外，新合成的化合物都有一定溶黄体细胞的作用，其中化合物7b,71的作用更强，它们的ED50分别为0.5μg/mL和1.6μg/mL。结论 新合成的化合物具有一定的损伤黄体细胞的活性，值得进一步研究。     

Synthesis and anti-tumor activities of novel pyrazolo[1,5-a]pyrimidines

A series of novel pyrazolo[1,5-a]pyrimidines were designed and synthesized in order to find novel potent anti-tumor compounds. The structures of all the compounds were confirmed by IR, (1)H-NMR, elemental analysis, and MS. Their anti-tumor activities against cancer cell lines were tested by the MTT method in vitro. Compound 19 displayed potent anti-tumor activity.     

Synthesis of 2,8-disubstituted imidazo[1,5-a]pyrimidines with potent antitumor activity

Seventeen 1,2,3,4-tetrahydroimidazo[1,5-a]pyrimidine derivatives bearing electron-withdrawing substituents were designed and synthesized by novel ring closure as potential antitumor agents. They were screened for their activities against mouse leukemia L1210 and human oral epidermoid carcinoma KB cell lines, and relationships of structure and antitumor activity in vitro are discussed. It was found that 8-thiocarbamoyl-1,2,3,4-tetrahydroimidazo[1, 5-a]pyrimidin-2(1H)-thione (8c) exhibited activity comparable to that of 5-fluorouracil against both L1210 and KB cells. The existence of both 2-thioxo and 8-substituent with a thioxo group in the molecule is crucial for the cytotoxicity against L1210 and KB cells. A novel procedure for introduction of a double bond between C-3 and C-4 in 8c was developed. Introduction of the 3,4-double bond increased the activity against L1210, but against KB cells the activity decreased by 4-fold. Cytotoxicity of compounds 8c and 8-thiocarbamoyl-1,2-dihydroimidazo[1,5-a]pyrimidin-2(1H)-thione (11c) against human solid tumor and leukemia cell lines was further evaluated. The saturation of the 3,4-double bond led to a significant increase in cytotoxicity against tumor cell lines tested.     

Synthesis and SAR of [1,2,4]triazolo[1,5-a]pyrimidines, a class of anticancer agents with a unique mechanism of tubulin inhibition

The synthesis and SAR of a series of triazolopyrimidines as anticancer agents are described. Treatment of 5-chloro-6-(trifluorophenyl)-N-fluoroalkyl [1,2,4]triazolo[1,5-a]pyrimidin-7-amine with an alcohol, a thiol, or an alkylamine provided the corresponding final compounds. A clear SAR requirement has been established for optimal activity. A (1S)-2,2,2-trifluoro-1-methylethylamino group or an achiral 2,2,2-trifluoroethylamino group is required at the 5-position to achieve high potency. On the phenyl ring, both fluoro atoms, at the positions ortho to the triazolopyrimidine core, are needed for optimal activity. At the position para to the triazolopyrimidine core, on the phenyl ring, the best activity is achieved with an oxygen linkage followed by a three-methylene unit, and an alkylamino or a hydroxy group. The mechanism of action for this series of triazolopyrimidines was shown to be unique in that they promoted tubulin polymerization in vitro, but did not bind competitively with paclitaxel.1 Instead, they inhibit the binding of vincas to tubulin. Selected compounds were studied further, and it was shown that these compounds were able to overcome resistance attributed to several multidrug resistance transporter proteins. Lead compounds were shown to inhibit tumor growth in several nude mouse xenograft models, with high potency and efficacy, when dosed either orally or intravenously.     

Design and synthesis of 4-substituted indolo[3,2-e][1,2,3]triazolo[1,5-a]pyrimidine derivatives with antitumor activity

New derivatives of the indolo[3,2- e][1,2,3]triazolo[1,5- a]pyrimidine system, substituted in the 4 position, were designed as novel antitumor agents because of their theoretical capability to form stable complexes with DNA fragments. The calculated free energies of binding were found in the range -12.76 --> -39.68 Kcal/mol. The docking studies revealed a common binding mode with the chromophore intercalated between GC base pairs, whereas the side chain lies along the minor groove. Compounds, selected on the basis of the docking studies and suitably synthesized, showed antiproliferative activity against each type of tumor cell line investigated, generally in the low micromolar range. The more active derivatives were shown to be 1eJ and 1eL, endowed with significant antiproliferative activity against the renal and CNS subpanels, respectively. A mechanism of action closely related to the DNA-interacting drugs can be supposed, although, alternative mechanisms, similar to those of the anthracyclines, can also operate.     

Synthesis and antifungal properties of certain 7-alkylaminopyrazolo[1,5-a]pyrimidines.

A series of 7-alkylaminopyrazolo[1,5-alpha]pyrimidines (5-25) and one 7-alkylthiopyrazolo[1,5-alpha]pyrimidine (4) were synthesized from the corresponding 7-chloro precursors 3, which were prepared in turn from the 7-hydroxy analogues 2, obtained via condensation of 3-aminopyrazoles with acetoacetate esters, malonate esters, or acetylenedicarboxylate ester. Compounds 4-25 were found to inhibit Trichophyton mentagrophytes (in vitro). The degree of inhibition increased with increasing 7-alkylamino chain length up to C8 units and then began to decrease with longer chain lengths. Unsaturated chains were more fungitoxic than saturated chains, 5-methyl-7-oleylaminopyrazolo[1,5alpha]pyrimidine [22, R7=NH(CH2)8CH=CH(CH2)7CH3] being four times more inhibitory and 16 times more fungicidal (against T. mentagrophytes) than 5-methyl-7-n-octylaminopyrazolo[1,5-alpha] pyrimidine [11, R7=NH(CH2)7CH3]. Although 11 and 22 appeared to have some efficacy as topical antifungeal agents, when applied to T. mentagrophytes infections in vivo, both caused irritation (of abraded and unabraded guinea pig skin) as did compound 4 (R5=Me; R7=SC8H17).     

Synthesis and antiallergy activity of 10-oxo-10H-pyrido[1,2-a]thieno[3,2-d]pyrimidines and 10-oxo-10H-pyrido[1,2-a]thieno[3,4-d]pyrimidines

Synthesis and antiallergy activity of 10-oxo-10H-pyrido[1,2-a]thieno[3,2-d]pyrimidines (2 and 3) and 10-oxo-10H-pyrido[1,2-a]thieno[3,4-d]pyrimidines (4 and 5) are described. The activity, shown by these compounds in the rat passive cutaneous anaphylaxis (PCA) test, is compared to the PCA data previously reported for a series of 4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidines. 10-Oxo-N-1H-tetrazol-5-yl-10H-pyrido[1,2-a]thieno[3,4-d]pyri midine (2b), 10-oxo-7-(1H-tetrazol-5-yl)-10H-pyrido[1,2-a]thieno[3,4-d]py rimidine (4e), and 3,10-dihydro-10-oxo-7-(1H-tetrazol-5-yl)-1H-pyrido[1,2-a]thieno[3, 4-d] pyrimidine (7e) gave a 100% inhibition in the rat PCA test at a dose of 5 mg/kg. The activity displayed by these compounds is comparable to that of the most active compounds in the 4-oxo-4H-pyrido[1,2-a]thieno[2,3-d]pyrimidine series.