An Efficient Method for the Synthesis of Indolo[3,2-c]quinoline Derivatives Catalyzed by Iodine

The reaction of Schiff base and indole catalyzed by iodine in DMA, subsequently treated with DDQ, gave indolo[3,2‐c]quinoline derivatives in good yields. The structure of 3e was confirmed by X‐ray diffraction analysis.     

新型三环系稠杂环[1,2,4]-三唑并[1,5-a][1]-苯并氮杂及[1,2,4]-三唑并[1,5-a]-喹啉的合成

α-四氢萘酮的乙氧羰基腙(1)经LTA氧化,得到α-偶氮-α-乙酰氧基化合物2.在A lC l3作用下,化合物2脱去乙酰氧基产生重氮正离子中间体3,再经与腈的1,3-偶极环加成、[1,2]-迁移扩环、碱性水解和与苦味酸作用,得到新型[1,2,4]-三唑并[1,5-a][1]苯并氮杂苦味酸盐6a~6c.以2,3-二氢-1-茚酮为底物,采用相同的合成路线,合成了1,2,4-三唑并[1,5-a]-二氢喹啉苦味酸盐12a~12c.     

Synthesis of (1H)-3,4-Dihydropyrrolo[2,1-c][1,4]oxazin-1-one Derivatives

It has been found that some acyl derivatives of 1,2,3,4-tetrahydro-1-indolizin-1-one 1and (1H)-3,4-dihydropyrrolo[1,2-a]pyrazin-1-one 2 show remarkable anti-inflammatory and analgesic activities1,2. The interest in extending the study of structure-activity relationships and search of new potent anti-inflammatory and analgesic agents led us to design and synthesize (1H)-3,4-dihydropyrrolo[2,1-c][1,4]oxazin-1-one 3 derivatives. NO 1 NNHO2 87654321ONO3 A few examples of the p…     

An efficient synthesis of fluorine-containing substituted spiro[piperidine-4,4′-pyrano[3,2-c]quinoline]-3′-carbonitrile by nonconventional methods

A series of fluorine-containing substituted spiro[piperidine-4,4′-pyrano[3,2-c]quinolines] were synthesized through a rapid one-pot multi-component reaction under microwave irradiation and sonication. The method has the advantages of excellent yields (80-96%) and short reaction time (3-10 min). We provide a series of fluorinated quinoline derivatives interesting for biological screening tests.     

低价钛促进的苯并咪唑并[1,2-c]喹唑啉衍生物的合成

利用低价钛试剂促进的2-邻硝基苯基苯并咪唑与原甲酸酯或丙酮或固体光气的反应, 合成了一系列苯并咪唑并[1,2-c]喹唑啉衍生物, 化合物的结构经IR, 1H NMR, MS和元素分析确定, 化合物4c的结构经单晶X射线衍射分析进一步确证. 该方法具有原料易得、操作简便和产率高等优点.     

DABCO-促进新型呋喃并[3,2-c]喹啉酮类化合物的合成

在1,4-二氮杂二环[2.2.2]辛烷(DABCO)促进下,以水为反应介质,通过3-溴乙酰基-4-羟基-1-甲基-2-喹啉酮与芳香醛的亲核取代、分子内环化及消除的串联反应,合成了9个新型的呋喃并[3,2-c]喹啉酮类化合物,其结构经~1H NMR,~(13)C NMR,IR,MS(ESI)和元素分析表征。     

Synthesis of furo[3,2-c]- and pyrano[3,2-c]quinolines by lanthanide triflate catalyzed imino-Diels-Alder reaction

Imino Diels-Alder reaction of imines with 2,3-dihydrofuran or 3,4-dihydro-2H-pyran proceeded smoothly in the presence of a catalytic amount (0.5 mol %) of ytterbium triflate to afford furo[3,2-c]- and pyrano[3,2-c] quinolines conveniently in high yield.     

Efficient One-pot Synthesis of Pyrrolo[2,1-a]isoquinoline and Pyrrolo[1,2-a]quinoline Derivatives

A one-pot sequential reaction for efficient synthesis of pyrrolo[2,1-a]isoquinoline and pyrrolo[1,2-a]-quinoline derivatives has been developed. The reaction included firstly the Cu-catalyzed three-component reaction of isoquinoline(quinoline), acetylenedicarboxylate and alkynylbenzene and then Cs₂CO₃-promoted intramolecular cyclization reaction of initially formed 1-alkenyl-2-alkynyl-1,2-dihydroisoquinoline(1,2-dihydroquinoline).     

四氢咪唑并[2',1':2,3]噻吩并[5,4-c]哌啶衍生物的合成及抗肿瘤活性

以4-哌啶酮为原料,经过胺基保护、缩合、环合、脱保护等步骤,设计合成了一系列新型的5,6,7,8-四氢咪唑并[2',1':2-3]噻吩并[5,4-c]哌啶类化合物。通过核磁共振波谱仪(~1H NMR、~(13)C NMR)、质谱(MS)和元素分析确证了其结构。对其体外活性研究发现,该类化合物对乳腺癌细胞MCF-7具有一定的抑制活性,其中化合物5a的抑制活性最为显著,半数抑制浓度(IC_(50))值达到了8.6μmol/L。为此类化合物的抗肿瘤活性研究提供了参考。     

Novel Synthesis of Thieno[2,3-c]Pyridazine and Pyrimido[4',5':4,5]thieno[2,3-c]pyridazine Derivatives

Abstract

Novel series of thieno[2,3-c]pyridazines and pyrimido[4′,5′:4,5] thieno-[2,3-c]pyridazines have been synthesized from the readily accessible 4-cyano-5,6-dimethylpyridazin-3(2H)-thione 3b.     

Synthesis,Antibacterial, and Antifungal Activities of Imidazo[2,1-c][1,2,4]triazoles and 1,2,4-Triazolo[4,3-a]pyrimidinones

A straightforward method has been developed for the synthesis of 1-phenyl-imidazo [2,1-c][1,2,4]triazole derivatives 5a–j and 1-phenyl-[1,2,4]triazolo[4,3-a]pyrimidinones derivatives 6a–g starting from 5-amino-1-phenyl[1,2,4]triazole and p-toluenesulfonic acid (PTSA). This methodology affords a number of 1-phenyl-imidazo [2,1-c][1,2,4]triazoles 5a–j and 1-phenyl-[1,2,4]triazolo[4,3-a]pyrimidinones 6a–g in reasonable yields and short reaction times. The structures of all new compounds were elucidated using infrared, ¹H and ¹³C NMR, and high-resolution mass spectrometry. Some of the newly synthesized compounds were screened for their antimicrobial activity.

[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications ^® for the following free supplemental resource(s): Full experimental and spectral details.]     

3-氨基-6/8取代-1H-吡唑[4,3-c]喹啉类化合物的合成

研究了合成3-氨基-6/8取代-1H-吡唑[4,3-c]喹啉类化合物的简易方法.通过3-芳基-4-氨基-5-巯基-1,2,4-三唑与6-/8-取代-4-羟基喹啉羧酸在三氯氧磷催化下的缩合反应及所生成的3-芳基-6-(6-/8-取代-4-氯喹啉-3-基)-1,2,4-三唑[3,4-b]-1,3,4-噻二唑类化合物与水合肼在乙醇中的肼解反应,合成了6个3-氨基-6/8取代-1H-吡唑[4,3-c]喹啉类化合物,并对活泼的氨基进行了初步研究,新化合物通过元素分析,IR,¹HNMR和MS确定结构,并讨论了其波谱性质.     

2-Keto-3-mercaptocinchoninic Acids as Precursors for Novel Thiazino[6,5-c]quinoline-1,5-dione Derivatives

2-Keto-3-mercaptocinchoninic acid derivatives 1a and b react with Schiff's bases 2a–d in toluene at refluxing temperature to give thiazino[6,5-c]quinoline derivatives 4a–h. Also, refluxing of 1a and b with arylazomalononitriles 5a–d in acetic acid afforded the thiazolo[6,5-c]quinoline derivatives 7a–d. The structure of all the newly synthesized products was confirmed based on elemental and spectral data.     

Theophylline as a new and green catalyst for the one-pot synthesis of spiro[benzo[a]pyrano[2,3-c]phenazine] and benzo[a]pyrano[2,3-c]phenazine derivatives under solvent-free conditions

A green, convenient, high yielding and one-pot procedure for the synthesis of novel spiro[benzo[a]pyrano[2,3-c]phenazine] derivatives by domino multi-component condensation reaction between 2-hydroxynaphthalene-1,4-dione, benzene-1,2-diamines, ninhydrine, and malononitrile in the presence of a catalytic amount of 1,3-dimethyl-7H-purine-2,6-dione (theophylline) as an expedient, eco-friendly and reusable solid base catalyst under thermal, microwave irradiation and solvent-free conditions. This procedure has also been applied successfully for the synthesis of benzo[a]pyrano[2,3-c]phenazines.     

Synthesis of novel ferrocenyl-containing pyrazolo[4,3-c]quinolines

Synthesis of novel ferrocenyl-substituted pyrazolo[4,3-c]quinolines via the Pictet-Spengler reaction is reported. Iminium intermediate formed by the condensation of pyrazole-based arylamine substrates with ferrocenecarboxaldehyde in acidic medium, undergoes 6-endo cyclization with sufficiently reactive aromatic moiety to form a pyrazolo[4,3-c]quinoline ring.     

Amidinoyl isothiocyanates in the synthesis of condensed heterocycles: Preparation of quinazolino[3,4-c][1,3,5]-benzotriazepines and quinazolino[3,4-c][1,2,3,5]-benzotetraazepines

Summary When heated, amidinoyl isothiocyanates (I) with 2-nitrophenyl isothiocyanate cyclize to 4-(2-nitroanilino)quinazolines (II) and after reduction to 2-amino derivatives (III). The latter serve as precursors to derivatives of the title compounds.

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Amidinoylisothiocyanate als Bausteine in der Synthese von kondensierten Heterozyklen. Darstellung von Chinazolino[3,4-c][1,3,5]-benzotriazepinen und Chinazolino[3,4-c][1,2,3,5]-benzotetraazepinen

Zusammenfassung Beim Erhitzen cyclisieren Amidinoyl-isothiocyanate (I) mit 2-Nitrophenyliso-thiocyanaten zu 4-(2-Nitroanilino)chinazolinen (II) und nach Reduktion zu 2-Aminoderivaten (III). Die letztgenannten dienen als Ausgangssubstanzen für Derivate der Titelverbindungen.

     

呋喃[2,3-b]喹啉衍生物的合成及其生物活性研究进展

呋喃[2,3-b]喹啉骨架作为目前发现数目最为庞大的一类天然呋喃喹啉结构,因其丰富的结构与良好的生物活性,吸引了大量研究者的关注。近年来,不仅许多新的天然呋喃[2,3-b]喹啉不断从自然界中被发现,而且基于生物活性研究的衍生物制备也得到蓬勃发展。为了充分利用这一宝贵天然资源,为活性天然产物的结构改造提供一定指导与参考,本文对近二十年来呋喃[2,3-b]喹啉衍生物的合成以及相关生物活性研究进行了总结,并展望其前景。     

Pyrazole Derivatives Part III Synthesis of Novel Naphtho[1,2-c]pyrazolebenzenesulfonylureas,Thioureas and Their Cycllzed Derivatives

Substituted p-(naphtho[1,2-c]pyrazol-2-yl)benzenesulfonylurea and thiourea derivatives 5–7 were prepared in three series. Cyclization of the thioureido group of compounds 7 by treating with ethyl bromoacetate, ethyl β-bromopropionate and α-bromoacetophenone afforded the corresponding thiazolidinone, thiazinone and thiazoline derivatives 8 , 9 and 10 respectively.     

新型氮杂异香豆素化合物的合成

以4-氯烟酸和芳基乙腈为原料,经取代和环合反应合成了3个新型的氮杂异香豆素化合物（3a~3c）,收率32.1%~89.0%,其结构经¹H NMR, IR, ESI-MS和元素分析表征。用X-单晶衍射研究了3a的亚甲基衍生物（4a）的晶体结构。4a(CCDC: 935 919)属三斜晶系,空间群P ī, 晶胞参数a=6.881(2) , b=9.768(2) , c=11.809(2) , β=104.125(10)°, V=732.1³, Dc=1.331 mg·cm^-3 , Z=2, F(000)=308, μ=0.090 mm^-1。并对环合反应机理进行了研究。     

取代1,2,4-三唑并[1,5-c]嘧啶衍生物的合成与生物活性

以肼基取代嘧啶为起始原料, 设计合成了16个新型的5-甲硫基-7-氯-1,2,4-三唑并[1,5-c]嘧啶-2-氧苄醚类及35个取代1,2,4-三唑并[1,5-c]嘧啶-2-氧苯醚类化合物, 通过元素分析、MS和1H NMR对所合成的化合物进行了结构表征. 初步生测结果表明, 部分化合物表现出不同程度的除草及杀菌活性.