离子液体中6-(2,3-环氧丙氧基)-2(1H)-喹啉酮及其衍生物的合成

6-(3-氨基-2-羟基丙基)-2-(1H)-喹啉酮衍生物被发现具有新的正性肌力的活性. 设计合成了一系列新的氨丙醇类喹啉酮化合物. 首先研究了6-羟基-2-(1H)-喹啉酮环氧化物2在离子液体中的合成, 该反应后处理简便, 收率高, 对环境友好. 然后用合成得到的2-(1H)-喹啉酮环氧化合物在离子液体中与一系列具有生物活性的有机碱反应, 合成了氨丙醇类2-(1H)-喹啉酮化合物3. 然后由6-羟基-2-(1H)-喹啉酮出发, 在离子液体中, 进行了一锅法合成氨丙醇类2-(1H)-喹啉酮化合物的研究. 制得的2b, 3b～3f 6个新化合物用IR, ¹H NMR, MS和元素分析进行了结构表征.     

离子液体中NaHSO4催化芳香醛与1,3-环己二酮的缩合反应

以NaHSO₄为催化剂, 在离子液体1-丁基-3-甲基咪唑四氟硼酸盐([bmim]BF₄)介质中, 由芳香醛与1,3-环己二酮衍生物制备了9-芳基-2,3,4,5,6,7-六氢-2H-氧杂蒽-1,8-二酮衍生物. 在沸水浴中反应1～2 h, 产率达81.2%～93.0%. 该方法反应时间短, 产率高, 催化剂价廉易得, 而且对环境友好.     

用铝-镍合金还原1-萘酚反应的再研究

文献曾报道以铝-镍合金为还原剂, 在稀碱水溶液中, 可以将1-萘酚(1)以高收率还原为5,6,7,8-四氢-1-萘酚(2). 本研究工作发现, 在相同的条件下该反应除了生成少量2外, 3,4-二氢-2H-萘-1-酮(3)和1,2,3,4-四氢-1-萘酚(4)为主要产物, 该结果明显不同于文献报道, 对反应产物分布及其可能机理进行了探讨. 该还原反应体系为3,4-二氢-1(2H)-萘酮(3)和1,2,3,4-四氢-1-萘酚(4)的合成提供了一条新途径.     

手性3,5-二甲基-2-芳基-2-吗啉醇盐酸盐的合成及其晶体结构

以(S)-2-氨基丙醇为手性源与α-溴-3-氯苯丙酮反应, (R)-2-氨基丙醇为手性源与6-甲氧基-2-(2-溴丙酰基)萘反应, 分别合成了手性纯化合物(2R,3R,5S)-3,5-二甲基-2-(3-氯苯基)-2-吗啉醇盐酸盐(4a)和(2S,3S,5R)-3,5-二甲基-2-(6-甲氧基-2-萘基)-2-吗啉醇盐酸盐(4b), 利用X射线单晶衍射仪测定了两化合物的晶体结构和两化合物的空间结构, 并初步分析两化合物空间结构, 化合物4a晶体属正交晶系, 空间群为P2₁2₁2, 晶胞参数为: a＝0.8718(2) nm, b＝0.7883(2) nm, c＝2.0247(6) nm, Z＝4, V＝1.3915(7) nm³, D_c＝1.328 g/cm³, F(000)＝584, R₁＝0.0399, wR₂＝0.0797, S＝1.042. 化合物4b晶体属正交晶系, 空间群为P2₁2₁2₁, 晶胞参数为: a＝0.71035 (9) nm, b＝0.77703(10) nm, c＝2.9820(4) nm, Z＝4, V＝1.6318(4) nm³, D_c＝1.318 g/cm³, F(000)＝688, R₁＝0.0520, wR₂＝0.1108, S＝0.994.     

新型无毒离子液体催化“一锅煮”合成3,4-二氢嘧啶-2(1H)-酮

利用新型无毒离子液体(BMImSac)作催化剂, 芳香醛、1, 3-二羰基化合物和尿素或硫脲三组分“一锅煮”合成了3,4-二氢嘧啶-2(1H)-酮. 与传统方法相比, 该法是一种操作简单、产率高、用时少的环境友好方法.     

N-取代-6-(3-氯-4-氯甲基-2-氧吡咯烷-1-基)-7-氟-3,4-二氢-2H-1,4-苯并噁嗪-3-酮衍生物的合成与生物活性研究

采用生物活性基团拼接的分子设计方法, 将活性基团2-氧吡咯烷引入到2H-[1,4]苯并噁嗪-3(4H)-酮分子结构的苯环上, 设计并合成了16个未见文献报道的N-取代-6-(3-氯-4-氯甲基-2-氧吡咯烷-1-基)-7-氟-3,4-二氢-2H-1,4-苯并噁嗪-3-酮衍生物6a～6p, 其结构经IR, ¹H NMR, LC/MS和元素分析确证. 初步的生物活性测试结果表明, 部分化合物具有较高的除草和杀虫活性, 如6c～6f等化合物在用量为150 g/hm²时对苘麻(Abutilon theophrasti)、刺苋(Amaranthus spinosus)和藜(Chenopodium album L)等阔叶杂草具有90%以上的抑制率, 6l和6o在500 mg/L浓度下对蚕豆蚜(Aphis fabae)具有90%以上的致死率, 个别化合物还兼具除草及杀虫活性.     

基于2-甲基-8-羟基喹啉的镝单分子磁体的晶体结构及磁性

以2-甲基-8-羟基喹啉(HL)为配体合成了2个含有镝离子的配位化合物[Dy₂L₄(HL)₄(H₂O)₂](ClO₄)₂·2H₂O(1)和[Dy₂L₆(C₂H₅OH)]·H₂O(2)。虽然在这两个配位化合物中配体都是2-甲基-8-羟基喹啉,但其参与配位的方式不同。这导致2个化合物中镝离子所处的配位环境不同,进而对化合物的磁性产生了影响。     

7-取代苯氧基-4,5-二氢-1,2,4-三唑并[4,3-a]喹啉和喹啉-1(2H)-酮衍生物的合成及抗惊厥活性

合成了7-取代苯氧基-4,5-二氢-1,2,4-三唑并[4,3-a]喹啉(3a～3g)和7-取代苯氧基-4,5-二氢-1,2,4-三唑并[4,3-a]喹表明啉-1(2H)-酮(4a～4g)类衍生物. 以最大电惊厥法和戊四唑法测定了抗惊厥活性, 以旋转棒法测定了神经毒性. 结果表明, 化合物7-(4-氟苯氧基)-4,5-二氢-1,2,4-三唑并[4,3-a]喹啉-1(2H)-酮(4c)显示最强的抗惊厥作用和低的神经毒性, 其抗电惊厥ED₅₀为6.8 mg/kg, 神经毒性TD₅₀为88.0 mg/kg, 保护指数PI为12.9, 明显优于对照药苯妥英钠.     

KF-alumina 催化下2-氨基-4-芳基-5,6-二氢化-4H-吡喃[3,2-c]喹啉-5-酮-3-羧酸酯衍生物的一步合成

以芳醛、氰乙酸酯和4-羟基喹啉-2-酮为原料, 乙醇为溶剂, 在KF-Al₂O₃催化下80 ℃, 一步合成了2-氨基-4-芳基-5,6-二氢化-4H-吡喃[3,2-c]喹啉-5-酮-3-羧酸酯衍生物, 和其它方法相比, 具有反应条件温和, 容易操作和产率高等优点, 产物4a的结构通过X单晶衍射分析确证.     

无溶剂条件下5,6-二取代-2,3-吡啶二酮的合成

在无溶剂条件下, 由3-羟基-2(1H)-吡啶酮与取代苯胺在NaIO₃作用下合成了一系列5,6-二取代-2,3-吡啶二酮, 产物结构由元素分析, ¹H NMR, MS, IR得到确认. 该方法具有反应条件温和、操作简单和产率高等优点.     

2-Phenyl-4-quinolinone Alkaloids from Casimiroa edulis Llave et Lex (Rutaceae)

Summary.  Three new 4-quinolinone alkaloids (5,6-dimethoxy-2-(3-methoxyphenyl)-1H-quinolin-4-one, 5,6-dimethoxy-2-(3,4-dimethoxyphenyl)-1H-quinolin-4-one, 5,6-dimethoxy-2-(2,5,6-trimethoxyphenyl)-1H-quinolin-4-one) were isolated from the leaves of Casimiroa edulis Llave et Lex (Rutaceae) cultivated in Egypt. Their structures were determined by UV/Vis, IR, ¹H and ¹³C NMR, and EI mass spectroscopy. The alkaloids were also detected in the kernels of the seeds. Received May 28, 2001. Accepted (revised) July 24, 2001     

2-Phenyl-4-quinolinone Alkaloids from Casimiroa edulis Llave et Lex (Rutaceae)

 Three new 4-quinolinone alkaloids (5,6-dimethoxy-2-(3-methoxyphenyl)-1H-quinolin-4-one, 5,6-dimethoxy-2-(3,4-dimethoxyphenyl)-1H-quinolin-4-one, 5,6-dimethoxy-2-(2,5,6-trimethoxyphenyl)-1H-quinolin-4-one) were isolated from the leaves of Casimiroa edulis Llave et Lex (Rutaceae) cultivated in Egypt. Their structures were determined by UV/Vis, IR, ¹H and ¹³C NMR, and EI mass spectroscopy. The alkaloids were also detected in the kernels of the seeds.     

Identity double-proton transfer in (3Z)-3-hydroxy-1,4-di(quinolin-2-yl)but-3-en-2-one

Although there is a very fast (on the NMR timescale) double-proton transfer in (1Z,3Z)-3-hydroxy-4-quinolin-2-yl-1-quinolin-2(1H)-ylidenbut-3-en-2-one (the product of the condensation of ethyl oxalate with 2lithiomethylquinoline), it is the only species present in chloroform solution. Comparison of the product of condensation of ethyl oxalate with 2lithiomethyl derivatives of pyridine (recent studies) and quinoline (present studies) shows that benzoannulation considerably affects the tautomeric equilibrium. The observed changes are not only quantitative but also qualitative. Moreover, contrary to the proton transfer in the pyridine tautomers, this process is fast in the quinoline tautomers. Comparison of the experimental and ab initio/DFT GIAO-calculated (13)C and (15)N chemical shifts for the transition states in the proton-transfer reactions between (1Z,3Z)- 3-hydroxy-4-quinolin-2-yl-1-quinolin-2(1H)-ylidenbut-3-en-2-one and its tautomers support the theory that a concerted identity reaction takes place between the enolimine-enaminone and enaminone-enolimine tautomeric forms. As a consequence, the most stable tautomeric form, (1Z,3Z)-1,4-di(quinolin-2-yl)buta-1,3-diene-2,3-diol, is not present in the tautomeric mixture.     

Synthesis and microbial screening of 8-(benzyloxy)-5-(2-[1,3-diphenyl-1H-pyrazol-4-yl]thiazol-4-yl)quinolin-2(1H)-one derivatives

The present investigation describe the synthesis of 8-(benzyloxy)-5-(2-[1,3-diphenyl-1H-pyrazol-4-yl]thiazol-4-yl)quinolin-2(1H)-one derivatives. Quinolin-8-ol was transformed by five step synthetic procedures into 8-Benzyloxy-5-(2-bromo-acetyl)-1H-quinolin-2-one. Subsequently, 8-Benzyloxy-5-(2-bromo-acetyl)-1H-quinolin-2-one condensed with 1,3-Diphenyl-1H-pyrazole-4-carbothioic acid amide in the presence of acetonitrile to afford 8-(benzyloxy)-5-(2-[1,3-diphenyl-1H-pyrazol-4-yl]thiazol-4-yl)quinolin-2(1H)-one derivatives. Synthesized compounds were screened for their antimicrobial activity against gram-positive and gram-negative bacteria. Most of the synthesized compounds are found to be active against tested bacterial strains and fungal strain.     

Syntheses of Benzoxepinoquinolinone and Benzothiepinoquinolinone

l-Benzoxepino(3, 4-b)quinolin-l3(6H)-one and its halogen,alkyl, alkoxy derivatives Va'-d' and 1-benzothiepino(3,4-b}-quinolin- 13 ( 6H)-one Vf, and its alkyl derivatives Vg, weresynthesized through cyclization of 2-(substituted phenoxymethyl)-3-quinolinecarboxylic acids Va-d and 2-[ (un)substituted phen-ylthiomethyll-3-quinolinecarboxylic acids IVf-g in the presence ofpolyphosphoric acid.The acids IV were obtained from the corresponding ethyl-esters @ whcih were prepared through refluxing ethyl 2-bromo-methyl-3-quinolinecarboxylate(1) with substituted phenol or (un)substituted thiophenol in the presence of NaOEt.The compound Vg, was allowed to react with NBS, KaBH4, NH2OH-HCl to give compounds VII , VIII, and IX, respectively.The structures of 24 new compounds have been confirmed by elemental analysis, IR and 1H NMR.     

Synthesis and Evaluation of 2-{[(2-Oxo-1H-quinolin-8-yl)oxy]methyl}-Substituted α-Methylidene-γ-butyrolactones

O-Alkylation of 8-hydroxy-1H-quinolin-2-one ( 1 ) afforded 8-(2-oxopropoxy)-1H-quinolin-2-one ( 2 ) which was immediately cyclized to form the tricyclic 2,3-dihydro-3-hydroxy-3-methyl-5H-pyrido[1,2,3-de][1,4]benzoxazine,-5-one ( 3). The Reformatsky-type condensation of 3 furnished antiplatelet 8-[(2,3,4,5-tetrahydro-2-methyl-4-methylidene-5-oxofuran-2-yl)melhoxy]-1H-quinolin-2-one ( 4 ). Its counterparts 7a – f , Ph-substituted at C(2) of the furan ring, were obtained from 1 via alkylation and the Reformatsky-type condensation. Although compound 4 was less active against platelet aggregation than 7a – f , it was the only compound which exhibited significant inhibitory activity on high-K⁺ medium, Ca²⁺-induced vasoconstriction and was more active than most of its Ph-substituted counterparts against norepinephrine-induced vasoconstrictions.     

Chemical transformation of Baylis-Hillman adducts: the reaction of methyl 3-arylamino-2-methylene-3-phenylpropanoates in polyphosphoric acid

We synthesized some interesting compounds including 3-benzylidene-3,4-dihydro-1H-quinolin-2-one, 3-benzylquinolin-2-ol, 4-amino-2-benzylideneindan-1-one, and 1-amino-9a,10-dihydro-4bH-indeno[1,2-a]inden-9-one skeletons starting from Baylis-Hillman adducts.     

Preparation, reactivity and tautomeric preferences of novel (1H-quinolin-2-ylidene)propan-2-ones

1,1-Difluoro-3-(1H-quinolin-2-ylidene)propan-2-one 1a, 1,1,1-trifluoro-3-(1H-quinolin-2-ylidene)propan-2-one 1b, 1,1,1-trifluoro-3-(4-chloro-1H-quinolin-2-ylidene)propan-2-one 1c and 1,3-dibromo-1,1-difluoro-3-(2-quinolyl)propan-2-one 2 are prepared and characterized by various spectroscopic techniques. The crystal structure of 1a is determined by X-ray diffraction. Furthermore, a series of previously known non-halogenated (1H-quinolin-2-ylidene)propan-2-ones 1d-1h are oxidized with AgBrO₃ in the presence of AlCl₃. In all cases, 2-(1-bromo-1-chloromethyl)quinoline 3 is obtained in high yield. The bromination order and sites of 1a are analyzed based on ab initio MP2 and DFT calculations for the molecule and its anions.     

The synthesis of benzofuroquinolines. III. Two dihydroxybenzofuroquinolinones

Two dihydroxybenzofuroquinolinones, 3,9-dihydroxy-5H-benzofuro[3,2-c]quinolin-6-one (V) and 3,8-dihydroxy-6H-benzofuro[2,3-b]quinolin-11-one (VI), were obtained by the demethyl-cyclization of 3-(2,4-dimethoxyphenyl)-4-hydroxy-7-methoxy-1H-quinolin-2-one (IV). By the methylation with diazomethane, V gave a dimethylated compound (VII), while VI gave a trimethylated compound (VIII).     

Tautomerism in quinaldyl ketones

The quinaldyl ketone, 4-phenyl-3-(quinolin-2-yl)-butan-2-one was prepared by two methods: (a) benzylation of 1-(1H-quinolin-2-ylidene)propan-2-one in the presence of sodium hydride in dimethylformamide and (b) by the benzylative demethoxycarbonylation of methyl 2-(1H-quinolin-2-ylidene)-3-oxobutanoate in the presence of lithium bromide in hexamethylphosphoramide at 135°. In the absence of acid, the compound exists exclusively in the tautomeric form, 4-phenyl-3-(1H-quinolin-2-ylidene)butan-2-one.