New 1H‐Pyrazole‐4‐Carboxamides with Antiplatelet Activity

Nine title compounds were synthesized and investigated in the Born test for their antiplatelet activities against collagen, ADP, adrenaline, and platelet activating factor (PAF) as inducers of the aggregation. Using collagen three compounds with IC₅₀ values below 100 μM were found ( 3b , 3e , 3i ). Activities in nanomolar concentrations were observed against ADP ( 3b , IC₅₀ = 9.4 nM), adrenaline ( 3i , IC₅₀ = 5.8 nM), and platelet activating factor ( 3e , IC₅₀ = 0.45 nM).     

Structure,stability, and antiplatelet activity of O-acyl derivatives of salicylic acid and lipophilic esters of acetylsalicylate

The anti-thrombotic activity of acetylsalicylic acid (ASA) has been shown to be due to specific irreversible acetylation of blood platelet cyclooxygenase. The aim of our study was to investigate the associations between the antiplatelet activities of derivatives of both ASA and salicylic acid (SA), as well as the structure, stability, and molecular properties of these compounds. Homologous series of O-acyl derivatives of salicylic acid (propionyl-, butyrylsalicylic acids, PSA, BSA) and lipophilic dodecyl (C12)-, hexadecyl (C16)-, and cholesteryl acetylsalicylates were synthesized and tested for structure-activity relationships. The molecular properties (heat of formation, molecular surface area, dipole moment) of ASA and SA derivatives obtained by theoretical calculations changed with the increasing length of the acyl or alkyl residue. The inhibition of whole blood platelet aggregation and the reduction in thromboxane (TX) generation by O-acyl derivatives were concentration-dependent and decreased along with increasing the length of acyl chain. These effects correlated with the extent of platelet reactivity and P-selectin expression inhibition in collagen-activated platelets. In contrast to ASA and O-acyl derivatives of SA, none of the lipophilic ASA derivatives had a significant inhibitory effect on platelet aggregation.In conclusion, all SA and ASA derivatives studied under in vitro conditions showed much lower antiplatelet activities than ASA itself, despite their higher affinity to plasma proteins or membrane components and their equivalent ability to acetylate protein free amino groups.We suggest the significance of the carboxylic group, dipole moment, geometry, and size of these pharmaceuticals in their ability to bind to the active site of cyclooxygenase and their antiplatelet efficacy.     

二氢哒嗪酮类化合物的合成及其抗血小板聚集活性研究

目的：合成新的哒嗪酮类化合物，并研究其抗血小板聚集活性。方法：在6-（4-氯乙酰氨基苯基）-4，5-二氢-3（2H）-哒嗪酮侧链引入不同取代的哌嗪，合成了一系列化合物，采用^1H-NMR、IR及元素分析等方法确证其结构。采用Born比浊法进行体外抗血小板聚集药理实验。结杲：合成的10个化合物都具有一定的抗血小板凝集的活性，其中化合物4的抗血小板聚集活性明显优于先导化合物MCI-154。结论：4-位取代哌嗪环基的引入对哒嗪酮类化合物抗血小板聚集的活性有显著影响。     

阿魏酸衍生物的合成及抗血小板聚集活性

以具有活血化瘀作用的中药有效成分阿魏酸为先导物,设计合成了6个阿魏酸衍生物,其结构经IR、1H NMR、13C NMR及MS确证。体内药效筛选结果显示,阿魏酸衍生物对二磷酸腺苷(ADP)诱导的血小板聚集具有较好的抑制活性,其抑制作用明显强于阳性对照药奥扎格雷钠。     

Synthesis and pharmacological evaluation of some 4-oxo-quinoline-2-carboxylic acid derivatives as anti-inflammatory and analgesic agents

The synthesis and the pharmacological activity of a series of 1-aroyl derivatives of kynurenic acid methyl ester (4-oxo-quinolin-2-carboxy methyl (KYNA) esters), structurally related to NSAID indomethacin are described. The derivatives were screened in vivo for anti-inflammatory and analgesic activities. Most of the compounds exhibited good anti-inflammatory and analgesic activities. An automatic docking of the synthesized compounds was performed using X-ray structures of COX-1 and COX-2. Docking results are in good accordance with the experimental biological data.     

新型哒嗪酮衍生物的合成及其对血小板聚集的抑制作用

目的 合成新的含有胺基的哒嗪酮类化合物,并研究其对此类化合物抗血小板聚集活性的影响.方法 设计合成未见报道的目标化合物9个,所有化合物均经过1H-NMR谱等确证;参考文献方法进行体外药理实验.结果 发现所有化合物都具有抗血小板凝集的活性,其中化合物9c,9e和9i的抗血小板凝集活性明显优于对照化合物MCI-154和CCI-17910.结论 引入不同的取代胺基,对化合物抑制血小板聚集的活性有影响.     

Synthesis of 5-phenyl-1-(3-pyridyl)-1H-1,2,4-triazole-3-carboxylic acid derivatives of potential anti-inflammatory activity

A series of 5-phenyl-1-(3-pyridyl)-1H-1,2,4-triazole-3-carboxylic acid derivatives 4-10 were synthesized by rearrangement of 4-(3-pyridyl)-hydrazono-2-phenyl-2-oxazolin-5-one 3 in the presence of different nucleophiles to afford derivatives 4, 7, and 8, while hydroxamic acid derivative 6 was prepared from reaction of methyl ester 4 with hydroxylamine hydrochloride. Semicarbazide 9 and thiosemicarbazide 10, derivatives of the 5-phenyl-1-(3-pyridyl)-1H-1,2,4-triazole-3-carboxylic acid, were synthesized via hydrazide 8 with potassium cyanate and appropriate isothiocyanate, respectively. The structures of the synthesized compounds were confirmed by elemental analyses, IR, (1)H-NMR, and mass spectra. The results of the anti-inflammatory activity of the synthesized derivatives showed that most of the tested compounds 4-10 showed significant inhibition against carrageenan-induced rat paw edema in albino rats. Derivatives 4 and 8 showed promising results and were found to be equipotent or more potent than Indomethacin and Celecoxib as reference drugs at two dose levels, 5 and 10 mg/kg, and they have no ulcerogenic activity.     

Design and synthesis of new 1,3-benzdiazinan-4-one derivatives as selective cyclooxygenase (COX-2) inhibitors

A new group of regioisomeric 2,3-diaryl-1,3-benzdiazinan-4-ones, possessing a methyl sulfonyl pharmacophore, were synthesized and their biological activities were tested for cyclooxygenase-2 (COX-2) inhibitory activity. In vitro COX-1/COX-2 inhibition studies identified 3-(p-fluorophenyl)-2-(4-methylsulfonylphenyl)-1,3-benzdiazinane-4-one (2b) as a potent and highly selective (IC(50) = 0.07 μM; selectivity index = 572.8) COX-2 inhibitor.     

Synthesis, analgesic and anti-inflammatory evaluation of some new 3H-quinazolin-4-one derivatives

In this study, we have synthesized a series of 3H-quinazolin-4-ones in order to obtain new compounds with potential analgesic and anti-inflammatory activity. The structures of the newly synthesized compounds were confirmed by means of infrared, nuclear magnetic resonance and mass spectroscopy. Some compounds were evaluated for their analgesic and anti-inflammatory activities by writhing and carrageenan-induced rat paw edema tests, respectively. In comparison to the standard drug indomethacine, compounds 4, 6c, 12-14, 16, 18, 19, and 22 induced significant reduction in the writhing response while compounds 6c, 12, 14, 16, 18, and 22 produced a good dose-dependent anti-inflammatory activity. The best dual analgesic / anti-inflammatory relative activity was observed with compounds 6c, 14, 16, 18, and 22.     

哒嗪酮类新衍生物的合成及其对血小板聚集的抑制作用

目的研究引入取代仲胺类基团对6-(4-取代乙酰氨基苯基)-5-甲基-4,5-二氢-3(2H)-哒嗪酮类化合物抗血小板凝集活性的影响。方法设计合成未见报道的目标化合物10个,所有化合物均经过1H-NMR谱等确证;参考文献方法进行体外药理实验。结果所有化合物都具有抗血小板凝集的活性,其中化合物9c,9f和9j的抗血小板凝集活性明显优于对照药MCI-154和CCI-17910。结论取代仲胺基团的空间位阻和亲水性对化合物抗血小板凝集的活性有影响。     

丁香酸衍生物的合成及抗血小板聚集活性

目的:合成丁香酸衍生物并考察其抗血小板聚集活性。方法:以丁香酸乙酯为原料,经W il-liamson醚化和水解反应合成丁香酸衍生物,并通过抗血小板聚集试验对目标化合物进行抗血小板聚集活性评价。结果与结论:合成了2个目标化合物,其结构经IR,1H-NMR,13C-NMR及MS确证。初步药理实验结果表明,目标化合物在体外显示出较好的抗血小板聚集活性。     

Synthesis and effects on the COX-1 and COX-2 activity in human whole blood ex vivo of derivatives containing the [1]benzothienol-[3, 2-d]pyrimidin-4-one heterocyclic system

Methyl and phenyl derivatives containing the [1]Benzothieno [3, 2-d]pyrimidin-4-one system have been synthesized and tested as inhibitors of COX-1 and COX-2 activities in human whole blood (HWB) ex vivo; all compounds turned out to be weak inhibitors of COX-1 activity, as deduced from the TXB(2) (thromboxane B) generation; the acid phenyl derivative 11 b was an interesting inhibitor of COX-2 activity, as deduced from the PGE(2) (prostaglandine E) generation.     

Investigations of new pyridazinone derivatives for the synthesis of potent analgesic and anti-inflammatory compounds with cyclooxygenase inhibitory activity

In this study we describe the synthesis of two novel 4-phenyl-and 4-(2-chlorophenyl)-6-(5-chloro-2-oxo-3H-benzoxazol-7-yl)-3(2H)-pyridazinone derivatives (compounds 8a and b) and their testing as inhibitors of cyclooxygenases (COX-1 and COX-2). Both compounds inhibited COX-1 (by 59 % and 61 % for compounds 8a and 8b respectively and COX-2 (by 37 % and 28 % for compounds 8a and 8b respectively) at a concentration of 10 microM. Furthermore, we tested the analgesic and anti-inflammatory activities of the synthesized compounds in vivo by using the p-benzoquinone-induced writhing test and the carrageenan-induced hind paw edema model, respectively. Compounds 8a and 8b showed potent analgesic and anti-inflammatory activities without causing gastric lesions in the tested animals.     

7-苯乙酰氨基-3-吡啶甲基-3-头孢菌素-4-羧酸对甲氧苄酯的合成及其稳定性考察

以 GCL E为原料 ,与碘化钾反应 ,得到 7-苯乙酰氨基 - 3-碘甲基 - 3-头孢菌素 - 4 -羧酸对甲氧苄酯 ,再与吡啶进行亲核取代反应 ,得到 7-苯乙酰氨基 - 3-吡啶甲基 - 3-头孢菌素 - 4 -羧酸对甲氧苄酯。该工艺操作简单 ,产品质量稳定 ,适合工业化生产。     

Synthesis and molluscicidal activity of 5-oxo-5,6,7,8-tetrahydro-4H-chromene derivatives

Furfurylidenemalononitriles and thienylidenemalononitriles were treated with 1,3-cyclohexanediones to afford 2-amino-4-hetaryl-5-oxo-5,6,7,8-tetrahydro-4H-chromene-3-carbonitrile derivatives. The molluscicidal activity of these compounds was investigated.     

6-甲基-4-(1H)-吡啶酮-3-羧酸的制备

目的制备 6 甲基 4 (1H) 吡啶酮 3 羧酸。方法以 4 羟基 6 甲基 2 吡喃酮、N ,N 二甲基甲酰胺二甲氧基缩醛为起始原料 ,经两步反应制得目标化合物。结果与结论经熔点测定及1H NMR、MS分析确证目标产物结构 ,总收率为 39 6 % ,高于文献收率     

Synthesis, anti-inflammatory and analgesic activity of some new 4(3H)-quinazolinone derivatives

4(3H)-quinazolinone and pyrazole derivatives have been shown to have analgesic and anti-inflammatory properties. In this study, 14 new 3-methyl-4(3H)quinazolinone derivatives bearing 2-[1'-phenyl-3'-(substituted-phenyl)-2'-propenylidene]hydrazino or 2[5'-(substituted phenyl)-3'-phenyl-2'-pyrazolin-1'-yl] groups have been synthesized with the aim of obtaining new analgesic and anti-inflammatory leads. The structures were elucidated by means of UV, IR, 1H-NMR, 13C-NMR, mass spectroscopy, and elemental analysis data. The anti-inflammatory activities of the synthesized compounds were determined by carrageenan-induced hind paw edema test in mice. All the compounds showed statistically significant effects. For analgesic activity assessment, p-benzoquinone-induced writhing test was applied in mice. The results obtained were in accordance with the anti-inflammatory activity tests.     

Synthesis of L-2-amino-4-hexynoic acid and derivatives

A synthesis is described of optically pure L-2-amino-4-hexynoic acid and its derivatives, which can serve as potentially useful precursors for the preparation of highly tritium labeled norleucine-containing peptides, as well as other side-chain modified peptides. Catalytic tritiation of one derivative of this acetylenic amino acid afforded the (³H)-L-norleucine derivative with a specific activity of 115 ± 5 Ci/mmol.     

Synthesis and in vitro antileukemic activity of new 4-triazenopyrazole derivatives

Several new 4-(3,3-dimethyltriazeno)-5-benzamidopyrazole derivatives were prepared by reacting 4-diazo-5-benzamidopyrazole derivatives with dimethylamine. The compounds were tested at 10 microM for their vitro antileukemic activity against K562 (Human chronic myelogenous leukemia) and Raji (human Burkitt limphoma ) cell lines. Dacarbazine and methotrexate were used for comparative purpose. The 3-methyl-4-(3,3-dimethyltriazeno)-5-(substituted benzamido)pyrazoles, bearing the pyrazole nucleus free at 1 position, resulted more active than the 1-(substituted phenyl)-3-methyl-4-(3,3-dimethyltriazeno)-5-benzamidopyrazoles. Dacarbazine at 10 microM showed no activity in the above tests. The observed difference among Dacarbazine and the active 4-triazenopyrazoles migth be explained admiting that these last compounds, differently by Dacarbazine, did not follow a mechanism of action based on the cytochrome P-450 induced demethylation. The most active compound 2d showed growth inhibition values of 97.8 and 99.4% against K562 and Raji cell lines respectively. Methotrexate inhibition values at 0.2 microM against the above cell lines were 86.7 and 75.1% respectively.     

Synthesis and X‐ray study of the 6‐(N‐pyrrolyl)purine and thymine derivatives of 1‐aminocyclopropane‐1‐carboxylic acid

Abstract: The novel purine and pyrimidine derivatives of 1‐aminocyclopropane‐1‐carboxylic acid 1 and 2 were obtained by alkylation of 6‐(N‐pyrrolyl)purine and thymine with methyl 1‐benzamido‐2‐chloromethylcyclopropanecarboxylate. X‐ray crystal structure analysis shows that the cyclopropane rings in 1 and 2 posses Z‐configuration. The cyclopropane ring atoms and attached atoms of the benzamido and methoxycarbonyl moiety of both molecules are disposed perpendicularly to each other. The carbonyl oxygen of the methoxycarbonyl moiety adopts in both compounds a synperiplanar conformation with respect to the midpoint of the distal bond of the cyclopropane ring. The torsion angles φ and ψ for the 1‐aminocyclopropane‐1‐carboxylic acid residue in 1 and 2 correspond to a folded conformation, while the torsion angles ω define antiperiplanar conformation. Intermolecular hydrogen bonds connect the molecules of 1 into dimers. Each dimer is hydrogen‐bonded with four ethanol molecules, thus forming discrete unit. On the contrary, intermolecular hydrogen bonds link the molecules of 2 generating three‐dimensional network.