具有对称结构的吡咯并[3,4-b]喹啉-1-酮衍生物的超声辅助合成及荧光性能

以6-氯-2-氯甲基-3-喹啉甲酸乙酯(1)为底物,在无水乙醇中经超声辅助下分别与对苯二胺(2)和联苯二胺(3)中的两个氨基反应,得到具有对称结构的吡咯并[3,4-b]喹啉-1-酮衍生物(4,5).所合成的化合物未见文献报道,其结构经红外光谱、核磁共振氢谱、核磁共振碳谱和高分辨质谱得以确定.对化合物4和化合物5及过去报道的化合物6a-l进行荧光光谱测定,结果表明化合物4和化合物5及化合物6a-g具有较好的荧光性能.     

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。     

超声波促进离子液体中Biginelli一锅法合成苯并咪唑并[2,1-b]喹啉-6-酮

在超声波辐射下, 芳香醛、1,3-环己二酮和2-氨基苯并咪唑3组分在离子液体([bmim]Br)介质中经Biginelli反应“一锅煮”合成了一系列新型苯并咪唑并[2,1-b]喹啉-6-酮衍生物. 2-氨基苯并咪唑的使用是对经典的Biginelli反应的发展, 并且该方法具有反应条件温和、产率较高(65%～86%)及环境友好等优点. 产物经IR, ¹H NMR和元素分析确证了结构.     

10-氯-5-二乙氧基甲基-1,3-二甲基色烯并[4,3-d]吡唑并[3,4-b]吡啶-6(3H)-酮的合成和晶体结构

利用L-脯氨酸催化的5-氯水杨醛(1)与6-甲基-4-羟基吡喃酮(2)的缩合反应及硫酸铜催化下与1,3-二甲基-5-氨基吡唑(3)的串联反应,合成得到了10-氯-1,3-二甲基-5-(2-氧代丙基)色烯并[4,3-d]吡唑并[3,4-b]吡啶-6(3H)-酮(4)和10-氯-5-二乙氧基甲基-1,3-二甲基色烯并[4,3-d]吡唑并[3,4-b]吡啶-6(3H)-酮(5).化合物5的结构通过单晶X射线衍射法确定:晶体属于三斜晶系,空间群P-1;相对分子质量Mr=803.68;晶胞参数a=1.03160(10)nm,b=1.42900(13)nm,c=1.44268(15)nm;V=1.9448(3)nm~3;Z=2;晶胞密度Dc=1.372g/cm~3;吸收系数μ=0.228mm-1;单胞中电子的数目F(000)=840.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.0681,w R=0.2051.在晶体结构中色烯环与吡啶环及吡唑环近似于共平面.     

四氯化锆催化合成嘧啶并[4,5-b]喹啉-2,4(1H,3H)-二酮和11H-茚[1,2-b]喹啉-11-酮

以四氯化锆为催化剂,靛红、1,3-二甲基巴比妥酸/1,3-茚二酮在脂肪醇中能够通过多组分串联反应,有效地转化成为相应的稠环化合物嘧啶并[4,5-b]喹啉-2,4(1H,3H)-二酮和11H-茚[1,2-b]喹啉-11-酮,并巧妙地在这些含氮杂环中引入酯基.这些未见文献报道的化合物均通过了1H NMR、13C NMR、I...     

微波辐射下硅磺酸催化的香豆素并[4,3-d]吡唑并[3,4-b]吡啶的高效合成

在硅磺酸催化下,通过微波辐射的3-酰基香豆素与5-氨基吡唑的反应,一步高产率地合成了一系列香豆素并[4,3-d]吡唑并[3,4-b]吡啶衍生物.该方法具有反应时间短(20~30 min)、选择性好、产率高、操作简单和环境友好等优点.产物的结构经红外光谱、核磁共振谱及高分辨质谱予以确定.     

新型取代3-芳基-1,2,4-三唑并[3,4-b]苯并噻唑的合成及其杀菌活性

为了寻找新的含苯并噻唑稠杂环农药先导化合物,利用取代2-肼基苯并噻唑与取代苯甲酸在三氯氧磷中回流反应,合成了18个新型取代3-芳基-1,2,4-三唑并[3,4-b]苯并噻唑化合物,并利用1H NMR,EI-MS及元素分析对其结构进行了表征.初步生物活性试验结果表明,在50 mg/L浓度下,部分目标化合物对立枯丝核菌(Rhizoctonia solani)、西瓜壳二孢菌(Ascochyta citrullina)、香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)、烟草炭疽病菌(Colletotrichum nicotianae)具有中等杀菌活性.然而,部分化合物对灰葡萄孢菌(Botrytis cinerea)反而起到一定促进生长作用.     

1-甲基-3-苯基-5-对甲苯基-6,7,8,9,10,11,12,13,14,15-十氢-3H-环十二烷[d]吡唑并[3,4-b]吡啶的微波合成和结构表征

标题化合物(C30H35N3)以4-甲基苯甲醛、环十二酮和3-甲基-1-苯基-1 H-吡唑-5-胺,在三氟乙酸和醋酸的作用下,经微波辐射合成得到.其结构通过单晶X射线衍射法确定,晶体属单斜晶系,空间群P21/c,相对分子质量Mr=437.61,晶胞参数a=1.089 26(11)nm,b=2.192 7(2)nm,c=1.049 54(14)nm,V=2.464 1(5)nm3,Z=4,晶胞密度Dc=1.180g/m3,吸收系数μ=0.069mm-1,单胞中电子的数目F(000)=944.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.046 8,ωR=0.090 5.在晶体结构中新形成的吡啶环为共平面结构.     

3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑的 合成及生物活性

利用3-芳基-4-氨基-5-巯基-1,2,4-均三唑和对氯苯甲酰异硫氰酸酯在乙腈中反应, 得到一系列3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑, 用1H NMR, IR, MS和元素分析确定了其结构, 并对其进行了抑菌活性测试.     

新型1,2,4-三唑并[3,4-b]-1,3,4-噻二唑类衍生物合成及其抗病毒活性

以没食子酸为先导,经甲基醚化、无溶剂闭环、缩合反应合成了8个未见文献报道的1,2,4-三唑并[3,4-b]-1,3,4-噻二唑类衍生物,其结构经1H NMR,13C NMR,IR和元素分析表征.初步生物活性测试结果表明,部分化合物具有一定的抗黄瓜花叶病毒活性.     

Nicotinic acid-supported cobalt ferrite-catalyzed one-pot synthesis of substituted chromeno[3,4-b]quinolines

One-pot synthesis of substituted chromeno[3,4-b]quinoline derivatives was developed by three-component reaction of aldehydes, dimedone or 1,3-cyclohexadione, and 4-aminocoumarin in the presence of nicotinic acid-supported cobalt ferrite [CoFe₂O₄@SiO₂@Si(CH₂)₃Cl@NA] as a novel magnetic catalyst in chloroform at reflux conditions. Nicotinic acid-supported cobalt ferrite was characterized via Fourier transform infrared spectroscopy, X-ray diffraction, thermal gravimetric analysis, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopy, and vibrating sample magnetometry. Moreover, the catalyst could be easily recovered by magnetic separation and recycled up to five times without significant loss of its catalytic activity. The products formed in excellent yields over appropriate reaction times under environmentally friendly conditions. High efficiency and easy isolation of the catalyst from products by simple magnetic attraction are some of the considerable advantages of this procedure.     

Facile synthesis of some novel triazolo[3,4-b]thiadiazines and triazolo[4,3-b]tetrazines

4-Amino-5-ethyl-4H-1,2,4-triazole-3-thiol was used as a key intermediate for the synthesis of triazolo[3,4-b][1,3,4]thiadiazines, triazolo[4,3-b][1,2,4,5]tetrazines and Schiff’s base via reactions with various hydrazonoyl halides and salicyaldehyde, respectively. Moreover triazolyl-N-N′-triazole derivatives were prepared from reaction of Schiff’s base with various hydrazonoyl halides. The structures of all the newly synthesized heterocyclic compounds were established by considering elemental analysis and spectral data.     

Catalyst-free synthesis of novel 4H-indeno[1,2-b]furan-4-ones and furo[2,3-d]pyrimidines in water

An operationally simple, catalyst-free, and efficient protocol for the synthesis of novel 4H-indeno[1,2-b]furan-4-one and furo[2,3-d]pyrimidine derivatives by a one-pot reaction of 2-aminopyridines, 1,3-indandione, or barbituric acid and phenylglyoxal monohydrate in water at reflux, involving domino aldol condensation, Michael addition, and ring-closing reactions is described. This transformation has several advantages, including high yield, short reaction duration, simple workup, and simple purification.     

Synthesis of Some New Pyrazolo[3,4-b]Pyridlne and Pyrazolo[3,4-d]Pyrimidine Derivatives1

Several pyrazolo[3,4-b]pyridine (3,4) and pyrazolo-[3,4-d]pyrimidine (5-13) derivatives were prepared using 5-amino-l-(5-ethyl-5H-1,2,4-triazino[5,6-b]-indol-3-yl)-lH-pyrazole-4-carbonitrile (2) . The pyridine derivatives 3 and 4 were obtained by reaction of 2 with malononitrile and ethyl cyanoacetate, respectively, while pyrimidine analogs 5-13 were synthesized cither by a one-step or multi-step sequence.     

Green synthesis of naphtho[2,3-f]quinolin-13-one and naphtho[2,3-a]acridin-1(2H)-one derivatives catalyzed by heteropoly acid supported montmorillonite K-10 clay

Herein, synthesis of a series of naphtho[2,3-f]quinolin-13-one and naphtho[2,3-a]acridin-1(2H)-one derivatives directly by one-pot multi-component reaction of 1,3-dicarbonyl compounds (1,3-indanedione/1,3-cyclohexanedione), 2-aminoantharacene/2-naphthylamine and various substituted aldehydes under solvent-free conditions using heteropoly-11-molybdo-1-vanadophosphoric acid supported on montmorillonite K-10 clay catalyst (10% PVMoK-10) is reported. The successful formation of naphtho[2,3-f]quinolin-13-one and naphtho[2,3-a]acridin-1(2H)-one derivatives was confirmed by various spectroscopic techniques. This study offers a green approach for the synthesis of novel quinolinone derivatives.     

水介质中4-芳基-3-甲基-1-苯基-4,5,6,7,8,9-六氢化吡唑并[5,4-b]喹啉-5-酮衍生物的三组分一锅合成

在水介质中有十二烷基磺酸钠(SDS)存在下, 以芳醛、5-氨基-3-甲基-1-苯基吡唑、1,3-环己二酮三组分一锅反应合成了4-芳基-3-甲基-1-苯基-4,5,6,7,8,9-六氢化吡唑并[5,4-b]喹啉-5-酮衍生物, 产物的结构通过IR, ¹H NMR确证, 化合物4e的结构经单晶X射线衍射确证.     

An Efficient Synthesis of Pyrazolo[3,4-b]pyridine Derivatives in Ionic Liquid

A series of 3-methyl-1,4,6-triaryl-1H-pyrazolo[3,4-b]pyridines was synthesized via the reaction of 3-methyl-1-phenyl-1H-pyrazol-5-amine and α,β-unsaturated ketones in ionic liquid without any catalyst. This protocol has the advantages of easier work-up, milder reaction conditions, high yields and environmentally benign procedure.     

An unexpected reaction of cyanothioacetamide： Novel preparation of pyrazolo[3,4-b]-pyridine derivatives under MWI

An unexpected multi-component reaction of cyanothioacetarnide with aldehyde and aminopyrazole under MWI was reported. Through this reaction, a series of pyrazolo[3,4-b]-pyridine derivatives was prepared in high yields via simple operational procedure.