4-氯噻吩并[3,2-d]嘧啶的合成

报道了一条合成杂环4-氯噻吩并[3,2-d]嘧啶的新工艺。室温下2-氯丙烯腈缓慢滴加到巯基乙酸乙酯和乙醇钠的乙醇溶液中,经环合反应制得3-氨基噻吩-2-甲酸乙酯,其溶于乙酸乙酯后通入氯化氢成盐进行稳定和分离。3-氨基噻吩-2-甲酸乙酯的盐酸盐直接在过量的甲酰胺中,于140℃下第二次关环生成噻吩并[3,2-d]嘧啶-4（3H）-酮。噻吩并[3,2-d]嘧啶-4（3H）-酮在甲苯为溶剂,三乙胺为碱,100℃条件下与三氯氧磷进行氯代制备了4-氯噻吩并[3,2-d]嘧啶。本工艺与传统氯代方法进行比较后的优点是避免了使用过量有毒的三氯氧磷,后处理简单安全。     

吡啶并[3′,2′:4,5]噻吩并[3,2-d]嘧啶类衍生物的研究进展

吡啶并[3′,2′:4,5]噻吩并[3,2-d]嘧啶类衍生物具有独特的化学结构和多元杂环原子,类似于天然产物稠杂环生物碱具有广泛的生物活性和较低生物毒性,得到科研人员的关注。本文通过嘧啶环上2、3、4位和其他类型取代衍生物进行分类,改变不同位置的取代基团,具有多种生物活性,尤其在抗肿瘤方面能够显著提高抑制肿瘤细胞生长,概述了吡啶并[3′,2′:4,5]噻吩并[3,2-d]嘧啶类衍生物的合成方法和生物活性的研究,展望了稠杂环药物分子的设计方向和发展前景。     

含噻二唑环噻吩并[2,3-d]嘧啶类含氟衍生物的合成及抗肿瘤活性

通过2-氨基-3-氰基噻吩与三氟乙酸、三氯氧磷反应"一锅法"制得2-三氟甲基-4-氯噻吩并[2,3-d]嘧啶,收率为60%,再与2-氨基-5-(取代苄硫基)-1,3,4-噻二唑发生芳香族亲核取代反应合成10个含噻二唑环噻吩并[2,3-d]嘧啶类含氟衍生物,收率为64%~75%。目标化合物的结构经红外光谱、核磁共振氢谱、质谱与元素分析表征,并采用MTT法对其进行初步的体外抗肿瘤活性筛选。结果表明,化合物Ⅳc和Ⅳf对Hep G2和BGC-823细胞的抑制活性高于对照样吉非替尼。     

噻吩并[2,3-d]嘧啶衍生物的研究现状

2,4-二氨基噻吩并[2,3-d]嘧啶类衍生物和2-氨基-4-氧代噻吩并[2,3-d]嘧啶类衍生物是一些重要生物活性化合物的母体结构,对这两类化合物进行了归纳,并对其合成方法逐一进行了简要阐述.     

具有抗肿瘤活性的噻吩并嘧啶衍生物的研究进展

噻吩并嘧啶类化合物在医药方面受到广泛关注。按照噻吩并[3,2-d]嘧啶、噻吩并[2,3-d]嘧啶、噻吩并[3,4-d]嘧啶化合物等进行分类,简要介绍了在抗肿瘤活性方面和合成方法上的研究进展。     

奥莫替尼合成路线图解

综述了奥莫替尼(■)的合成工艺,并针对其不同的合成路线进行了分析和研究,提出适合工业化生产的路线。以2-硫代-2,3-二氢噻吩并嘧啶-4-酮(■)为起始原料,经过甲基化、磺酰基化及亲核取代等一系列反应得到关键中间体2-((4-(4-甲基哌嗪-1-基)苯基)氨基)噻吩并[3,2-d]嘧啶-4(3H)-酮(■),最后中间体■经过氯代及亲核取代反应制得目标化合物■。该合成路线易于操作,收率较高,成本偏低,适合工业化生产。     

含噻吩并[3,2-d]嘧啶的查尔酮类化合物的合成和抗增殖活性

运用药物分子片段原理及拼合原理,设计并合成了10个含噻吩并[3,2-d]嘧啶的查尔酮类衍生物,并对该类化合物的体外抗对肿瘤细胞增殖活性进行初步研究。目标化合物的结构通过1H NMR、13C NMR和HRMS (ESI)表征。以人肺腺癌细胞株A549、人肝癌细胞株HepG2和人前列腺癌细胞株PC-3三种肿瘤细胞为测试细胞株,采用MTT法评价了目标化合物的抗增殖活性。体外活性实验表明,10个化合物对三种肿瘤细胞株均具有很好的抑制活性。其中化合物Ⅶh活性突出,对三种肿瘤细胞株的IC50 值分别为0.87 μmol/L、2.43 μmol/L和2.02 μmol/L,优于阳性对照药索拉非尼。含噻吩并[3,2-d]嘧啶的查尔酮类化合物具有很好的抗肿瘤活性,值得进一步研究。     

一种2,4-二氯噻吩并[3,2-D]嘧啶的制备方法

正本发明涉及一种2,4-二氯噻吩并[3,2-D]嘧啶的制备方法,具体涉及以3-氨基噻吩-2-甲酰胺、三光气和三氯氧磷为原料,经关环反应和氯化反应两步高产率合成2,4-二氯噻吩并[3,2-D]嘧啶;本发明合成路线所提供的2,4-二氯噻吩并[3,2-D]嘧啶的制备方法是一种高收率、低成本、易操作、适宜工     

苯并呋喃[3,2-d]嘧啶类衍生物生物活性及研究进展

阐述了苯并呋喃[3,2-d]嘧啶类化合物在抗菌、抗炎、抗癌、降血糖及抑制血小板聚集和促进长时记忆等方面的应用,对苯并呋喃[3,2-d]嘧啶类衍生物的合成方法进行总结,并且对这类化合物的发展趋势进行了分析。     

2-烷氧基-3-对氟苯基-5-甲基-6-(1H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3H)-酮的合成及其抑菌活性研究

通过Gewald反应合成噻吩衍生物,再由噻吩衍生物、对氟苯基异氰酸酯分别与甲醇、乙醇、正丙醇经串联aza-Wittig反应合成了3个新型的2-烷氧基-3-对氟苯基-5-甲基-6-(1 H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3 H)-酮,经1 HNMR、MS和元素分析表征了其结构,并初步测定了合成化合物的抑菌活性。结果表明,在用药浓度为5×10-5g·L-1时,3种化合物对常见农作物菌种均表现出一定的抑菌活性,其中以2-甲氧基-3-对氟苯基-5-甲基-6-(1 H-1,2,4-三唑-1-基)噻吩并[2,3-d]嘧啶-4(3 H)-酮的活性最高,对水稻纹枯菌的抑制率达90%。     

Solid supported synthesis of new thieno[2,3-d]pyrimidines

A new and practical procedure for the synthesis of novel thieno[2,3-d]pyrimidines is described here. A series of thieno[2,3-d]pyrimidines was readily obtained from the corresponding aromatic and heterocyclic carboxylic acids using Montmorillonite K-10 dry media under microwave irradiation and solvent less conditions.     

Neue Synthese von substituierten 4-Amino-chinazolinen und deren Heteroanalogen

New Synthesis of Substituted 4-Amino-quinazolines and Their Heteroanaloga N-Chloracetyl-anthranilonitriles react with potassium thiocyanate in the presence of alcohol to the (4-aminoquinazolin-2-yl-thio)-acetic acid ester ( 5 ). In the presence of water or primary amine the acetic acid derivative ( 6 ) or the acetic acid amide derivatives ( 7 ) are obtained. 2,4-Diaminoquinazolines ( 8 ) arise if vigorous reaction conditions are employed. With 2-chloracetylamino-cyclopent-1-en-carbonitrile as starting material the pyrimidines ( 11 ) are formed from the reaction with potassium thiocyanate. Analogously, (4-pyrimidyl-2-yl-seleno)-acetic acid ester ( 12 ) and (thiazolo[4,5-d]pyrimid-2-yl-seleno)-acetic acid derivatives ( 16 ) can be prepared with potassium selenocyanate. N-Chloracetyl derivatives of 5-membered heterocycles with enamino-nitrile structure ( 13 , 15 , 18 , 20 ) react with potassium thiocyanate to yield thieno[2,3-d]-, thiazolo[4,5-d]-, pyrrolo[2,3-d]-, furo[2,3-d]- and pyrazolo[4,3-d]pyrimidines ( 14 , 16 , 19a , 19b , 21 ).     

New potential antitumoral fluorescent tetracyclic thieno[3,2-b]pyridine derivatives: interaction with DNA and nanosized liposomes

Fluorescence properties of two new potential antitumoral tetracyclic thieno[3,2-b]pyridine derivatives were studied in solution and in liposomes of DPPC (dipalmitoyl phosphatidylcholine), egg lecithin (phosphatidylcholine from egg yolk; Egg-PC) and DODAB (dioctadecyldimethylammonium bromide). Compound 1, pyrido[2',3':3,2]thieno[4,5-d]pyrido[1,2-a]pyrimidin-6-one, exhibits reasonably high fluorescence quantum yields in all solvents studied (0.20 ≤ ΦF ≤ 0.30), while for compound 2, 3-[(p-methoxyphenyl)ethynyl]pyrido[2',3':3,2]thieno[4,5-d]pyrido[1,2-a]pyrimidin-6-one, the values are much lower (0.01 ≤ ΦF ≤ 0.05). The interaction of these compounds with salmon sperm DNA was studied using spectroscopic methods, allowing the determination of intrinsic binding constants, Ki = (8.7 ± 0.9) × 103 M-1 for compound 1 and Ki = (5.9 ± 0.6) × 103 M-1 for 2, and binding site sizes of n = 11 ± 3 and n = 7 ± 2 base pairs, respectively. Compound 2 is the most intercalative compound in salmon sperm DNA (35%), while for compound 1 only 11% of the molecules are intercalated. Studies of incorporation of both compounds in liposomes of DPPC, Egg-PC and DODAB revealed that compound 2 is mainly located in the hydrophobic region of the lipid bilayer, while compound 1 prefers a hydrated and fluid environment.     

噻吩并[3,2-d]嘧啶-4(3H)-酮的合成工艺研究

报道了一种噻吩并[3,2-d]嘧啶-4(3H)-酮的简便、高效合成新工艺。巯基乙酸乙酯和2-氯丙烯腈在乙醇钠作用下进行环合制得3-氨基噻吩-2-甲酸乙酯,然后在乙酸乙酯中与氯化氢气体成盐进行分离。3-氨基噻吩-2-甲酸乙酯的盐酸盐直接与过量的甲酰胺关环制得噻吩并[3,2-d]嘧啶-4(3H)-酮,两步总产率约80%。     

Thieno[3,2-b]thiophene as π-bridge at different acceptor systems for electrochromic applications

Benzoselenadiazole, quinoxaline and thieno[3,2-b]thiophene are the units preferred in conducting polymers due to their electrochemical properties. There are no reports in the literature on polymers containing both moieties. In this study, novel benzoselenadiazole, quinoxaline and thieno[3,2-b]thiophene based monomers; 4-(3a,6a-dihydrothieno[3,2-b]thiophen-2-yl)-7-(thieno[3,2-b]thiophenyl)benzo[c][1,2,5]selenadiazole (BSeTT) and 2,3-bis(3,4-bis(decyloxy)phenyl)-5,8-dibromo-2,3-dihydroquinoxaline (QTT) were synthesized via Stille Coupling and polymerized electrochemically. These polymers were characterized in terms of their spectroelectrochemical and electrochemical properties by cyclic voltammetry and UV–Vis–NIR spectroscopy. Spectroelectrochemistry analysis of PBSeTT revealed an electronic transition at 525 nm corresponding to π–π* transition with a band gap of 0.93 eV whereas PQTT revealed electronic transitions at 440 and 600 nm corresponding to π–π* transitions with a band gap of 1.30 eV. Electrochromic investigations showed that PBSeTT has gray color PQTT switching between green and gray. Switching time of the polymers was evaluated by a kinetic study upon measuring the percent transmittance (%T) at the maximum contrast point.     

Fine tuning of frontier orbital energy levels in dithieno[3,2-b:2′,3′-d]silole-based copolymers based on the substituent effect of phenyl pendants

A series of dithieno[3,2-b:2′,3′-d]silole-based π-conjugated copolymers containing thieno[3,4-c]pyrrole-4,6-dione or thieno[3,4-b]thiophene units bearing 4-substituted phenyl pendants were synthesized and their thermal stability, optical properties and frontier orbital energy levels were systematically investigated. The introduction of electron-withdrawing substituents on the phenyl rings lowered their frontier orbital energy levels without deteriorating their thermal and optical properties. By replacing an electron-donating methoxy group with an electron-withdrawing trifluoromethyl group, both the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital energy levels of the polymers were deepened by more than 0.3 eV. A relatively linear relationship was observed between the HOMO energy levels and the Hammett substituent constants.     

Improved bulk-heterojunction polymer solar cell performance through optimization of the linker groupin donor–acceptor conjugated polymer

Two donor–acceptor conjugated polymers PCTBTC8 and PCTTBTC12 have been prepared from Suzuki coupling reactions between the 2,7-carbazole and alkoxy substituted 2,1,3-benzothiadiazole units with two different linker groups thiophene and thieno[3,2-b] thiophene, respectively. The polymer PCTTBTC12 with the thieno thiophene linker group possessed a red-shifted UV-vis absorption spectrum and similar HOMO level in comparison with PCTBTC8. BHJ polymer solar cells were fabricated to investigate the photovoltaic properties of the two polymers and the polymer PCTTBTC12 showed superior device performance than PCTBTC8 with a significantly improved current density. In addition, the hole only devices tests results indicated that the hole mobility of the polymer was increased by replacing the thiophene group with fused thieno thiophene as the linker. The relationships between the device performance with the light absorption, energy levels, BHJ film morphology and hole mobility are discussed in details. And the improved photovoltaic property of the polymer PCTTBTC12 probably can be contributed to the better light absorption spectrum and enhanced hole transporting ability related to the more electron rich nature and planar structure of the thieno[3,2-b] thiophene group.