Strandberg型磷钼氧酸盐[Co(en)3]2[P2Mo5O23]·3H2O催化合成阿司匹林的研究

目的:研究Strandberg型磷钼氧酸盐[Co (en)3]2[P2Mo5O23]·3H2O单晶体催化合成阿司匹林的催化性能.方法:采用水热合成法制备[Co(en)3]2[P2Mo5O23]·3H2O单晶体化合物;以阿司匹林产率为考察指标,选用L25 (53)表进行正交试验其催化合成阿司匹林的性能进行研究;利用显色法、熔点法、核磁共振氢谱法对催化产物进行结构鉴定.结果:确定了[Co(en) 3]2[P2Mo5O23]·3H2O单晶体化合物催化合成阿司匹林的最佳工艺条件为:催化剂用量0.15g,反应时间30min,反应温度90℃.结论:[Co (en)3]2P2Mo5O23]·3H2O单晶体化合物能够高效地催化合成阿司匹林,并且具有无污染、低成本、可循环再生使用等优点.     

钯催化2,3-二氢咪唑并[2,1-b]噁唑类衍生物的合成

目的 建立一种高效、温和的钯催化构建2,3-二氢咪唑并[2,1-b]噁唑杂环的方法,并用于合成CGI-7341及PA-824关键中间体.方法 通过条件筛选,以Pd2(dba)3为催化剂、JohnPhos为配体、Cs2CO3为碱、甲苯和四氢呋喃为溶剂、反应温度为90℃的最优反应条件,制备一系列2,3-二氢咪唑并[2,1-...     

[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。     

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。     

2-[(吡啶-4-基)甲基氨基]-N-[4-(三氟甲基)苯基]苯甲酰胺的合成工艺研究

目的合成2-[(吡啶-4-基)甲基氨基]-N-[4-(三氟甲基)苯基]苯甲酰胺(Ⅰ)。方法以邻硝基苯甲酸为起始原料,经氯代、氨解、水合肼还原、缩合、硼氢化钠还原共5步反应合成得到目标化合物Ⅰ。结果与结论经5步反应合成了目标化合物Ⅰ,其结构经核磁共振氢谱、质谱确证。改进后的合成工艺反应条件温和,操作简便,收率可达54.5%。     

1,2,4-三唑并[4,3-a]喹啉衍生物的合成及其抗惊厥活性

目的 设计合成一系列1,2,4-三唑并[4,3-a]喹啉衍生物,并评价其抗惊厥活性和神经毒性.方法 以4-羟基喹啉-2(1H)酮为起始原料,经烷基化、氯代、肼代、环合等反应合成1,2,4-三唑并[4,3-a]喹啉衍生物.通过最大电惊厥实验(MES)和旋转棒法(Rotarod),分别测定目标化合物的抗惊厥活性和神经毒性....     

抗疟药的研究 1,3-双[4-[2-(取代苯乙烯基)吡啶基-4-]哌嗪基-1-]丙烷的合成及其抗疟活性

2-(取代苯乙烯基)-4-氨基吡啶类化合物(Ⅰ)对感染伯氏鼠疟原虫的小鼠具有较好的治疗作用~[1]。为了提高这类化合物的抗疟作用并延长其作用时间,我们模拟长效抗疟药喹哌(Ⅱ)的结构特点,合成了双分子化合物——1,3-双[4-[2-(取代苯乙烯基)吡啶基-4-哌嗪基-1-]丙烷(Ⅲ)。     

钯催化的键生成反应

钯催化的键生成反应（bond-forming reaction）是目前非常活跃的化学研究领域，吸引众多药物化学家的关注，因为这些反应已广泛应用于尚处在研发阶段新药的先期合成。本文探索钯催化反应在生产放大中遇到的一些问题、钯催化氨化反应使用的新型配体以及钯催化合成吲哚的关键前体芳香肼。     

特拉匹韦中间体(3aS,6aR)-1,3a,4,5,6,6a-六氢环戊并[c]吡咯的合成工艺研究

目的优化抗丙肝药物特拉匹韦中间体(3aS,6aR)-1,3a,4,5,6,6a-六氢环戊并[c]吡咯的合成工艺。方法通过有机小分子催化不对称迈克尔加成反应,以1,6-己二醇为起始原料,经氧化、催化环合、不对称迈克尔加成、缩醛保护、催化氢化、脱保护环合等反应制得目标化合物。结果与结论新工艺路线能够高效构建手性中心,避免了拆分过程,采用"一锅法"提高了产品收率。     

三唑并[4,5-d]嘧啶类化合物的合成及其抗血小板聚集活性研究

目的合成新的三唑并[4,5-d]嘧啶类化合物,并对其体外抗血小板聚集活性进行评价。方法以抗血栓新药替格瑞洛为先导化合物,对其进行结构简化,将难以合成的环戊醇结构用简单的链状醇结构代替,设计合成了一系列三唑并[4,5-d]嘧啶类化合物。以氨基醇为原料,首先与4,6-二氯-2-正丙巯基嘧啶-5-胺进行缩合,然后环化成三唑环,再与各种取代胺发生第二次缩合,最终合成目标化合物。采用Born氏法对化合物抗兔血小板聚集活性进行了评价。结果与结论共合成了17个新的三唑并[4,5-d]嘧啶类化合物,其结构均经1H-NMR、13C-NMR和MS谱确证。体外抗血小板聚集活性结果显示,具有邻二羟基结构的化合物的活性明显高于其他化合物,表明邻二羟基是该类化合物的关键活性基团。化合物9i对血小板聚集的抑制率为75.2%,约为阳性对照药替格瑞洛的80%,但其结构远比替格瑞洛简单,更易于合成,可作为先导化合物继续进行结构优化,以期发现更高效的抗血栓新药。     

Synthesis and antimicrobial activities of novel naphtho[2,1-b]pyran, pyrano[2,3-d]pyrimidine and pyrano[3,2-e][1,2,4]triazolo[2,3-c]-pyrimidine derivatives

The synthesis of new naphtho[1',2':5,6]pyrano[2,3-d]pyrimidines and related heterocycles has been reported. The key intermediate 3-amino-8-bromo-1-(p-methoxyphenyl)-1H-naphtho[2,1-b] pyran-2-carbonitrile (3c) was obtained in one pot synthesis by treating alpha-cyanocinnamonitrile (1c) with 6-bromo-2-naphthol (2). Antimicrobial activity was shown for some of the synthesized compounds.     

Multicomponent synthesis of poly-substituted benzo[a]pyrano[2,3-c]phenazine derivatives under microwave heating

A new one-pot two-step tandem synthesis of highly functionalized benzo[a]pyrano[2,3-c]phenazine derivatives via microwave-assisted multicomponent reactions of 2-hydroxynaphthalene-1,4-dione, diamines, aldehydes, and malononitrile is reported. The procedures are facile, avoiding time-consuming and costly syntheses, tedious workup, and purifications of precursors, as well as protection/deprotection of functional groups. The method is expected to find application in the combinatorial synthesis of biologically active compounds, since phenazine and chromene motifs have a broad spectrum of biological activities.     

Synthesis and anticonvulsant activity of pyrano[4′,3′:4,5]pyrido[2,3-b]thieno[3,2-d] pyrimidine derivatives and pyrimido[5′,4′:2,3]-thieno[2,3-c]isoquinoline derivatives

Methods for the synthesis of condensed thieno[3,2-d]pyrimidines based on pyrano[4,3-d]thieno[2,3-b]pyridines and thieno[2,3-b]isoquinolines have been developed and a series of new derivatives have been synthesized. The anticonvulsant activity of the synthesized compounds has been studied. Several compounds possessing specific anticonvulsant activity with respect to corazole-induced convulsions are revealed. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 41, No. 9, pp. 14–16, September, 2007.     

A short expedient synthesis of [14C]Ticlopidine

To support the development of a reactive metabolite strategy, the preparation of several radiolabelled compounds such as [¹⁴C] Ticlopidine was required. In this report, we describe a facile and rapid synthesis of [¹⁴C] Ticlopidine starting from [¹⁴C] carbon dioxide. The compound was radiolabelled in the 2‐chloromethyl portion of the molecule with a specific activity of 53.4 mCi/mmol and with a radiochemical purity of 98.5%. Storage stability was best as the hydrochloride salt in an ethanol solution. Copyright © 2014 John Wiley & Sons, Ltd.     

Synthesis of [2H4]oxymetazoline and [14C]oxymetazoline

An efficient synthesis of [²H₄] and [¹⁴C]oxymetazoline has been developed. Both compounds follow the same synthetic route with the introduction of the label occurring at different synthetic steps. The synthesis of [²H₄]oxymetazoline from [²H₄]ethylene diamine was achieved in one step with a 40% yield. The synthesis of [¹⁴C]oxymetazoline from potassium [¹⁴C]cyanide was achieved in two steps with an overall radiochemical yield of 67%. Copyright © 2010 John Wiley & Sons, Ltd.     

Radiosynthesis of [11C]ximelagatran via palladium catalyzed [11C]cyanation

N‐hydroxyamidines (amidoximes) may be used in prodrug technology in improving oral bioavailability of drugs containing amidino functional groups. In the body, amidoximes are reduced quickly to amidines by enzymes that are present in several organs. Ximelagatran is a benzamidoxime and ethyl ester prodrug of melagatran, which is a thrombin inhibitor. Our aim was to develop a fast and efficient labeling route for the synthesis of [¹¹C]ximelagatran ([¹¹C]3) with a label in a metabolically stable position. [¹¹C]3 was synthesized via a two‐step synthesis sequence, starting from palladium catalyzed [¹¹C]cyanation of its corresponding bromide precursor (2‐[2‐(4‐bromo‐benzylcarbamoyl)‐azetidin‐1‐yl]‐1‐cyclohexyl‐2‐oxo‐ethyl amino‐acetic acid ethyl ester) (1), followed by a reaction with hydroxylamine. [¹¹C]3 was synthesized with 27±17% total overall decay corrected yield (specific radioactivity of 2360±165 Ci/mmol at EOS), with a total synthesis time of 45 min. A fast and efficient labeling route for the synthesis of [¹¹C]3 was developed. Copyright © 2008 John Wiley & Sons, Ltd.     

Synthesis and antiprotozoal activity of [1,3]oxazino[4,5,6-de]quinolines

The synthesis of 1,3-oxazino-anellated 4-amino-5-hydroxy-quinolines has been investigated. Cyclisation to 2,3-dihydro[1,3]oxazino[4,5,6-de]quinoline-2-ones/-2-thiones (2/3) was achieved by reaction with 1,1'-carbonyldiimidazole or 1,1'-thiocarbonyldiimidazole. Cyclocondensation with aldehydes yielded 2,3-dihydro[1,3]oxazino[4,5,6-de]quinoline-derivatives (5). All new tricyclic compounds exhibited weak antiprotozoal activity against Plasmodium falciparum.     

Rapid and efficient synthesis of [18F]fluoronicotinamides, [18F]fluoroisonicotinamides and [18F]fluorobenzamides as potential pet radiopharmaceuticals for melanoma imaging

In an attempt to simplify nucleophilic radiofluorination reactions to be amenable for automation, a series of [¹⁸F]fluoronicotinamides, [¹⁸F]fluoroisonicotinamides and [¹⁸F]fluorobenzamides were synthesized using one‐step synthetic approach involving displacement reactions on trimethylammonium‐nicotinamide, trimethylammonium‐isonicotinamide and trimethylammonium‐benzamide precursors. Based on starting [¹⁸F]‐fluoride, radiochemical yields and purities were found to be greater than 90 and 97%, respectively, within 20 min synthesis time and, without high‐performance liquid chromatography purification. This synthetic approach holds great promise as a rapid and simple method for the automated radiofluorination of [¹⁸F]fluoronicotinamides, [¹⁸F]fluoroisonicotinamides and [¹⁸F]fluorobenzamides with high radiochemical yield and very short preparation time. Copyright © 2011 John Wiley & Sons, Ltd.     

Synthesis and pharmacological properties of 13H-naphtho[1',2':7,6] [1,4] diazepino[2,3-b] pyridines

The synthesis and properties of 13H-naphtho[1',2':7,6] [1,4] diazepino[2,3-b] pyridines (7a--g) were described. New compounds were studied in rats and in mice in the tests used for preclinical assessment of antidepressant or anxiolytic activity. Compound 7c showed weak antagonism towards the reserpine-induced hypothermia and shortened immobility time in the despair test. None of the tested compounds had an anxiety-relieving action.     

Synthesis and antiarrhythmic activity of 5,11-dihydro[1]benzoxepino[3,4-b]pyridines

During further modification of the new antiulcer agent 5 (KW-5805), a 5,11-dihydro[1]benzoxepino[3,4-b]pyridine derivative, we found that some new derivatives had antiarrhythmic activity. So we continued synthesis and evaluation of a series of 5-substituted 5,11-dihydro[1]benzoxepino[3,4-b]pyridines for antiarrhythmic activity in chloroform-induced ventricular arrhythmias in mice and in ouabain-induced ventricular arrhythmias in dogs. In chloroform-induced ventricular arrhythmias, the 7-methoxy group played an important role in activity and the type of terminal side chain at position 5 had not obvious effect on potency. On the other hand, in ouabain-induced ventricular arrhythmias, the structure-activity relationship was highly specific and only four compounds, 9, 30, 34, and 35, were effective. Compound 9,5-[[2-(diethylamino)ethyl]amino]-7-methoxy-5,11-dihydro[1] benzoxepino[3,4-b]pyridine 1.5-fumarate, which exhibited low affinity for muscarinic acetylcholine receptors and a high ED100(mydriasis)/ED50(antiarrhythmic activity) ratio, was selected for further development and clinical evaluation as KW-3407. The synthesis and antiarrhythmic activity of optically active 9 is described. The order of potency of antiarrhythmic activity in ouabain-induced ventricular arrhythmias in dogs was (-)-9, (+/-)-9, and (+)-9.