3,4-二芳基吡咯酮衍生物的合成和生物活性

考布他汀-A4(Combretastatins-A4,CA-4)是从天然产物中分离得到的抗癌活性化合物,其分子中Z-构型烯键易异构化转变为无抗癌活性的E-构型.以吡咯-2,5-二酮或吡咯-2-酮代替烯键,设计合成了4个新的CA-4类似物.它们的合成是以3,4-二甲氧基苯乙酮或3-氟-4-甲氧基苯乙酮为起始原料,经α-溴化、改良的Gabriel合成法、与3,4,5-三甲氧基苯乙酸缩合、环化-氧化或环化四步反应完成.其结构用1H NMR,13C NMR,ESI-MS及元素分析进行了表征.用MTT法测试了CA-4类似物对人白血病细胞HL-60、肝癌细胞SMMC-7721和肺腺癌细胞A549的体外抗肿瘤活性.初步结果表明,含氟化合物3,4-二芳基-2,5-吡咯酮(1b)的抗肿瘤活性接近CA-4,IC50值达到0.03～0.05μmol·L-1.     

硝酸铁催化氧化二芳基乙醇酮制备二芳基乙二酮

用AcOH作溶剂,PEG400做相转移催化剂,硝酸铁能将二芳基乙醇酮催化氧化为二芳基乙二酮。产物结构用IR,MS和1H NMR光谱对其进行了表征。该方法有反应时间短,产率较高,操作简便等优点,是一种有效的由二芳基乙醇酮氧化制备二芳基乙二酮的方法。     

微波促进下9-芳基氢化吖啶-1,8-二酮的合成研究

本文研究了微波促进下芳香醛、5,5-二甲基-1,3-环己二酮与碳酸氢铵的三组分无溶剂缩合反应,并通过该反应合成了一系列9-芳基氢化吖啶-1,8-二酮类化合物.这一合成方法具有操作简便、反应条件温和、产率高、对环境友好等特点.     

2,2-二烷基-2-烷胺基苯乙酮/二芳基酮复合引发体系光聚合的加和作用

本文研究了2,2-二烷基-2-烷胺基苯乙酮(α-AK)和二芳基酮(DAK)(包括二苯酮(BP)、米酮(MK)、二乙基蒽醌(EAQ)和硫杂蒽酮(TX))复合体系的加和作用。体系中DAK的添加显着地改善了α-AK在近紫外光区长波段无吸收的缺陷。光聚合实验比较了DAK的效果,其中氯代TX、BP增效作用显着,使聚合反应速度增加1.3～1.5倍,而MK和EAQ没有明显影响。同时还研究了溶剂极性、浓度和取代基的影响。结果表明,溶剂极性增加起负影响,α-AK/DAK等摩尔浓度效果最佳和氯代TX活性高于烷基取代TX.通过吸收光谱α-AK/DAK复合体系的加和作用机制进行了研究,结果证明三重态的能量传递敏化反应和光还原反应两种反应过程并存,它们的贡献因二芳酮不同而有差异。     

通过α-重氮-β-二酮与醛酮的环加成反应合成4H-1,3-二噁环己-5-烯-4-酮衍生物

研究了α-重氮-β-二酮与各类羰基化合物的环加成反应,合成了一系列4H-1,3-二噁环己-5-烯-4-酮衍生物.     

微波辐射下合成3-芳基-9-氨基-1,2,3,4-四氢吖啶-1-酮衍生物

在微波辐射和对甲基苯磺酸的催化作用下, 5-芳基-1,3-环己二酮与邻氨基苯甲腈进行缩合反应, 得到了N-取代的2-氨基苯甲腈衍生物, 在K₂CO₃和Cu₂Cl₂的催化作用下进一步合环, 得到3-芳基-9-氨基-1,2,3,4-四氢吖啶-1-酮衍生物, 用LiAlH₄还原羰基得到3-芳基-9-氨基-1,2,3,4-四氢吖啶-1-醇衍生物. 新合成化合物的结构均经元素分析、红外光谱和核磁共振光谱予以确认.     

One-pot Synthesis of 3-Aryl-1,5-bis（2-hydroxyaryl）pentane-1,5-diones

A simple method for the synthesis of 3-aryl-1,5-bis(2-hydroxyaryl)pentane-1,5-diones is developed by one-potreaction involving 2-hydroxyacetophenone and arylaldehyde in aqueous potassium hydroxide.     

酒石酸水溶液中绿色合成5-芳基亚甲基-1,3-二噁烷-4,6-二酮衍生物

在酒石酸水溶液中,以芳香醛和1,3-二噁烷-4,6-二酮为原料,合成了14种5-芳基亚甲基-1,3-二噁烷-4,6-二酮衍生物,收率81%～95%,其中4f, 4g, 5f和5g为新化合物,其结构经¹H NMR, ¹³C NMR和MS(ESI)表征。并对反应条件进行了优化,对反应机理进行了探讨。     

亚甲基烯酮与5-亚甲基-1,3-二噁烷-4,6-二酮反应机理的研究

利用半经验分子轨道理论AM1方法，研究了5-亚甲基-1，3-二噁烷-4，6-二酮与亚甲基烯酮的2，3-位C＝C，3，4-位C＝O和1，2-位C＝O三种双键位置上的环加成反应的反应机理．采用Berny梯度法优化得到反应的过渡态，并进行了振动分析确认．计算结果表明，环加成反应是按照协同的非同步途径进行的，经过一个扭曲的六员环过渡态，前线轨道分析表明反应机理为［4＋2］机理．根据AM1优化得到的产物反应物及过渡态的生成热可知三个反应的活化焓分别为27．07kJ·mol-1，32．41kJ·mol-1和137．96kJ·mol-1，2，3-位C＝C双键上的环加成反应的活化焓最低，这与实验中只观察到2，3－位C＝C双键上环加成产物的结论是一致的．     

超声条件下芳基格氏试剂与4-烷基苯乙酮的反应

二芳基乙烯;超声条件下芳基格氏试剂与4-烷基苯乙酮的反应     

Microwave-Assisted Michael Addition of Diethyl Malonate with Ferrocenyl Substituted Chalcones Under Solvent-Free Conditions

The article describes an efficient, economical, and environmentally friendly approach for Michael addition of diethyl malonate to ferrocenyl substituted chalcones in the presence of microwave irradiation under solvent-free conditions, affording the corresponding Michael adducts in moderate to good yields of 53–94%.

Synthesis of 1,5-Benzodiazepines with Unusual Substitution Pattern from Chalcones Under Solvent-Free Microwave Irradiation Conditions

1,5-Benzodiazepines have been synthesized from the corresponding 2′-hydroxychalcones [1-(2-hydroxyphenyl)-3-aryl-2-propen-1-ones] and o-phenylenediamine, both in methanol, under reflux and under solvent-free microwave irradiation conditions on alumina. The latter method proved to be advantageous.     

无溶剂条件下α-羟基磷酸酯的合成

在无溶剂条件下,以碳酸钾做催化剂,芳香醛与亚磷酸酯在室温下通过研磨,合成了一系列磷酸酯类化合物.该反应条件温和,操作简单,时间短,对环境友好,是一种绿色的合成方法.产物结构经IR,MS,1HNMR等方法表征.     

环己酮与查尔酮的无溶剂Michael加成反应

以环己酮和查尔酮为原料, 在 NaOH 存在下无溶剂室温研磨反应, 非常方便地得到Michael加成产物. 该方法具有反应条件温和、操作简单和产率较高等优点, 并通过IR, ¹H NMR和元素分析确证产物的结构.     

硅胶催化的微波加热无溶剂制备芳香酰胺实验设计

通过微波加热实现无溶剂制备N-苯基苯甲酰胺是典型的绿色酰胺化方法。这一方法采用廉价、环保的柱色谱硅胶为催化剂,催化性能好,效率高。使用苯甲酸和苯胺在120 ℃条件下10 min内完成酰化反应,产率大于90%,这一反应不仅原子经济,而且节约能源,因此,这一实验完全适合于大学实验教学中作为绿色有机实验推广使用。     

Oxidation-reduction Conversions of 1,4-Dihydropyridine Derivatives on Interaction of Alicyclic 1,5-Diketones with Nitroanilines

On interaction of alicyclic 1,5-diketones and the products of their intramolecular aldol condensation with 2- and 4-nitroanilines and 2,4-dinitroaniline reduction occurs of the nitro group by the intermediately formed 1,4-dihydropyridine derivatives. The reaction products are N-nitrophenyl- and N-aminophenylpyridinium salts and also N,N-phenylenebispyridinium salts.     

Reactions of 1,5-Diketones with Ammonia and Its Derivatives. (Review)

Published data and the authors' own experimental results on the reaction of aliphatic, semicyclic, and oxosemicyclic 1,5-diketones and alkylidene- and arylidene-2,2-dicyclanones with ammonia, ammonium acetate, and XNH₂ derivatives, where X = Alk, Ar, OH, NH₂, PhNH, ArCONH, and CHO, are reviewed. The characteristics and the relationships governing the transformations into azaheterocycles in relation to the nature of the reagents and the reaction conditions are discussed.     

Transformations of Mono- and Bisphenylhydrazones of Aliphatic-Aromatic 1,5-Diketones under the Conditions of the Fischer Reaction

The mono- and bisphenylhydrazones of 3-R-1,5-diphenylpentane-1,5-diones were obtained, and their transformations in the Fischer indole synthesis under various conditions were studied. It was shown that 4-R-2,6-diphenylpyridines, 2-phenylindole, and 5-R-1,3-diphenyl-²-pyrazolines are formed as the main products in addition to the 3-R-1-phenyl-3-(2-phenyl-3-indolyl)propan-1-ones or their phenylhydrazones produced as a result of indolization. The ways of formation of these compounds are discussed. Some transformations of the obtained ketones were studied.     

Reaction of Chalcones with Cellular Thiols. The Effect of the 4-Substitution of Chalcones and Protonation State of the Thiols on the Addition Process. Diastereoselective Thiol Addition

Several biological effects of chalcones have been reported to be associated with their thiol reactivity. In vivo, the reactions can result in the formation of small-molecule or protein thiol adducts. Both types of reactions can play a role in the biological effects of this class of compounds. Progress of the reaction of 4-methyl- and 4-methoxychalcone with glutathione and N-acetylcysteine was studied by the HPLC-UV-VIS method. The reactions were conducted under three different pH conditions. HPLC-MS measurements confirmed the structure of the formed adducts. The chalcones reacted with both thiols under all incubation conditions. The initial rate and composition of the equilibrium mixtures depended on the ratio of the deprotonated form of the thiols. In the reaction of 4-methoxychalcone with N-acetylcysteine under strongly basic conditions, transformation of the kinetic adduct into the thermodynamically more stable one was observed. Addition of S-protonated N-acetylcysteine onto the polar double bonds of the chalcones showed different degrees of diastereoselectivity. Both chalcones showed a Michael-type addition reaction with the ionized and non-ionized forms of the investigated thiols. The initial reactivity of the chalcones and the equilibrium composition of the incubates showed a positive correlation with the degree of ionization of the thiols. Conversions showed systematic differences under each set of conditions. The observed differences can hint at the difference in reported biological actions of 4-methyl- and 4-methoxy-substituted chalcones.