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在K2CO3作为碱、乙腈作为溶剂的条件下,将2-氯甲基-4-苯基喹啉-3-羧酸乙酯(3)分别与5,7-二氯-8-羟基喹啉(4a)和5,7-二溴-8-羟基喹啉(4b)发生Williamson反应,以高收率得到结构新颖的二氯或二溴取代的双喹啉类目标化合物2-(5,7-二氯/二溴-8-喹啉氧甲基)-4-苯基喹啉-3-羧酸乙酯(2a,2b);其结构经波谱数据和元素分析证实. 相似文献
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以6-溴-3-(氯苯基甲基)-2-甲氧基喹啉(2)为起始原料,经过偶合对接反应合成了新型喹啉类抗结核药物TMC-207的衍生物6-溴-3-[2-(6-溴-2-甲氧基喹啉-3-基)-1,2-二苯乙基]-2-甲氧基喹啉,其结构经1H NMR和HR-MS确证.最佳反应条件:2 10 mmol,Et_3N 5 mL,KI 0.17 g,乙腈150 mL,于80 ℃反应6 h,收率73%. 相似文献
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异喹啉盐具有两个亲电位点, 用它与双亲核试剂发生去芳构化/环化反应, 是高效构建异喹啉桥环结构的有效策略. 然而, 这一策略主要集中在1,3-桥环结构的合成. 最近利用异喹啉盐与4-羟基香豆素反应, 首次实现了二氢异喹 啉-3-酮-1,4-桥环的合成. 但是, 当用环状1,3-二酮代替4-羟基香豆素反应时, 意外地得到了异喹啉-1,3,4(2H)-三酮. 利用高分辨质谱分析发现, 这一意外转化是由于环状1,3-二酮发生O-亲核取代后, 消除2-溴-1,3-环状二酮, 得到4-溴异喹啉-3(2H)-酮. 该中间体发生两次连续水解/空气氧化后, 得到了异喹啉-1,3,4(2H)-三酮. 基于此机理的认识, 向反应体系中添加催化量的三氟甲烷磺酸后, 成功抑制了环状1,3-二酮的O-亲核取代反应, 顺利得到了二氢异喹啉-3-酮的1,4-桥环结构(33个反应实例). 反应条件温和, 提供了一种构建异喹啉1,4-桥环骨架的高效合成方法. 相似文献
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2-(取代哌嗪-1-甲基)-3-喹啉甲酸乙酯及其衍生物的合成、 表征及晶体结构 总被引:1,自引:0,他引:1
以邻硝基苯甲醛为起始原料, 经还原、Friedländer 缩合反应合成2-甲基-3-喹啉甲酸乙酯(2), 2经N-溴代丁二酰亚胺(NBS)溴代得到化合物3, 3再与N-取代哌嗪5a~5p 发生SN2亲核取代反应, 合成一系列2-(取代哌嗪-1-甲基)-3-喹啉甲酸乙酯及其衍生物6a~6p. 它们的结构通过元素分析, IR, 1H NMR, 13C NMR和MS进行了鉴定和表征, 并用X射线衍射法测定了化合物6n的晶体结构. 相似文献
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以芳胺和正丁醛为原料,对甲基苯磺酸(TsOH)为促进剂,采用"一锅法"合成了3-乙基-2-丙基喹啉衍生物,系统地考察了原料比例、溶剂以及芳胺上取代基对反应的影响,比较了不同的质子酸促进剂对喹啉衍生物产率以及选择性的影响,并对产物进行了核磁共振表征.实验结果表明当用对甲基苯磺酸(TsOH)为促进剂时,3乙基-2-丙基喹啉收率可达到59%,同时生成40%N-丁基苯胺;磷钼酸、浓硫酸也可以选择性地得到喹啉衍生物,但收率较低,分别只有28%和24%.同时,考察了苯胺环上取代基对喹啉收率的影响,当苯环上有供电子基时,有利于喹啉的生成,而吸电子基则不利于喹啉的生成.并推测了反应机理. 相似文献
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By the displacement reactions of 1-ethyl-4-chloro-3-carboethoxy-6,7-methylenedioxyquinolinium iodide ( 3a ), several 4-substituted derivatives including the 4-thioxo ( 1c ) and 4-amino derivatives ( 6 ) of oxolinic acid were prepared. The acid 1c and its N1-substituted derivatives ( 18a-h ) were prepared alternatively by alkylation of ethyl 4-ethylmercapto-6,7-methylenedioxy-3-quinolinecarboxylate ( 15 ) followed by treatment with sodium hydrosulfide and hydrolysis. 相似文献
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以5-芳基-1,3-环基环己二酮为原料合成了8个未见报道的吖啶酮衍生物,其结构均经元素分析,IR和^1H NMR光谱确证。其中3-呋喃基-6,7-亚甲二氧基-9-甲基-1(2H,4H)-吖啶醇对一些肿瘤细胞有抑制作用。 相似文献
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D. L. Leysen A. Haemers W. Bollaert R. A. Dommisse E. L. Esmans 《Journal of heterocyclic chemistry》1987,24(6):1611-1616
In order to prepare the 2-chloro derivative of oxolinic acid, ethyl 1-ethyl-1,4-dihydro-2-hydroxy-6,7-methylenedioxy-4-oxo-3-quinolinecarboxylate was treated with phosphorus oxychloride. The compound obtained was the 4-chloro-2-oxo-quinoline. The structure was confirmed by 13C nmr and mass spectral techniques. The 2-halocarbonitrile was obtained by a Sandmeyer reaction but could not be hydrolysed into the acid. 相似文献
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苯并氧杂并喹啉酮的合成 总被引:3,自引:1,他引:3
我们合成2-苯氧及取代苯氧甲基-3-喹啉酸乙酯(4-8)之后,经水解得相应的酸(9-13),再环化制得了1-苯并氧杂草并[3,4-b]喹啉-13(6H)-酮和其卤素及烷基取代衍生物(4)-(18)。由化合物(18)经氰化,水解得到羧酸衍生物(20)。对于19个新化合物的结构由元素分析、红外光谱及核磁谱予以证实。 相似文献
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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. 相似文献
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A versatile synthetic method for preparing 4‐hydroxyquinolone and 2‐substituted quinolone compounds from simple benzoic acid derivatives was demonstrated. The synthetic strategies involve the use of well known ethyl acetoacetate synthesis, malonic ester synthesis and reductive cyclization. The key intermediates were keto esters 4a‐e , which could be transformed to 4‐hydroxyquinolones 5a,b or 2‐substituted quinolone ethyl esters 6a‐c depending on the reaction conditions. 4‐Hydroxyquinolone analogues were prepared and investigated for N‐methyl‐D‐aspartate (NMDA) activity in vitro. Among these derivatives, 6,7‐difluoro‐3‐nitro‐4‐hydroxyquinolin‐2(1H)‐one ( 9 ) exhibited moderate activity. 相似文献
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The reaction of 2-benzothiazolinone, 2-benzoxazolinone or benzothiazoline-2-thione under basic conditions with various electrophiles afforded the titled compounds 1-13, 29-31 and 40-48. The 3-(substituted-aminomethyl)-2-benzothiazolinone and related compounds 14-25 were prepared by the reaction of 3-(hydroxymethyl)-2-benzothiazolinone or the appropriate 2-benzothiazolinone and formaldehyde with the appropriate amine or substituted aniline. The reaction of 9, 13 or 25 with methyl iodide afforded the quaternary ammonium iodides 26-28. The reaction of the appropriate potassium salts of various phenol with 3-(chloromethyl)-2-benzothiazolinone afforded the 3-(substituted-phenoxymethyl)-2-benzothiazolinone and related compounds 32-39. The ethyl or isopropylxanthates 49-54 were synthesized by the reaction of 3-(chloromethyl)-2-benzo-thiazolinone and appropriate compounds with potassium ethyl or isopropyl xanthate. The reaction of 3-(chloromethyl)-2-benzothiazolinone with sodium sulfide afforded the sulfide 55. 相似文献
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Two new flavans, (2R, 4R)-4′-hydroxy-3′,5′-methyl-6,7-methylenedioxy-4-O-2′-cycloflavan (1), and (2R, 4R)-4′-hydroxy-3′-methyl-6,7-methylenedioxy-4-O-2′-cycloflavan (2), along with six known compounds were isolated from the trunk and leaves of Horsfieldia glabra. Their structures were elucidated by means of extensive spectroscopic analysis. Compounds 1 and 2, together with 4–7 were assessed for their cytotoxicity against five human cancer cell lines (HL-60, SMMC-7721, A-549, MCF-7 and SW-480), and the result showed that they had no activity. 相似文献
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Kisil' S. P. Burgart Ya. V. Saloutin V. I. 《Russian Journal of Organic Chemistry》2001,37(10):1455-1462
For the first time were obtained ethyl 2-(2-methoxy-3,4,5,6-tetrafluorobenzoyl)-3-oxobutanoate and ethyl 2-pentafluorobenzoyl-3-oxobutanoate and their copper chelates. The compounds were prepared by acylation of ethyl acetoacetate with 2-methoxy-3,4,5,6-tetrafluoro- and pentafluorobenzoyl chlorides. Cyclization of these ,'-dioxoesters afforded substituted chromones. 2-Methyl-5-methoxy-6,7,8-trifluoro-3-ethoxycarbonylchromone hydrolyzes depending on reaction conditions either to 5-hydroxy-2-methyl-6,7,8-trifluorochromone or to 5-hydroxy-2-methyl-6,7,8-trifluorochromone-3-carboxylic acid. Reaction with morpholine provided 7-substituted product, and with aqueous ammonia as a result of rearrangement forms 3-acetimidoyl-4-hydroxy-5-methoxy-6,7,8-trifluorocoumarin. Hydrolysis of the latter yields 3-acetyl-4-hydroxy-5-methoxy-6,7,8-trifluorocoumarin. 相似文献