吡咯酰胺催化合成吡唑啉酮衍生物

探究了绿色高效合成医药价值较高的吡唑啉酮衍生物的方法,即：以吡咯酰胺催化吡唑啉酮与硝基烯进行Michael反应,高收率地合成了系列吡唑啉酮衍生物,其结构经¹H NMR和¹³C NMR确证。并考察了催化剂及其用量、溶剂和温度对反应的影响。结果表明;在室温下,CH₂Cl₂体系中,在10 mmol%催化剂E存在下,吡唑啉酮与硝基烯烃能有效进行Michael反应,收率80%~91%。     

吡唑啉酮衍生物及其金属配合物抗肿瘤研究进展

综述了吡唑啉酮衍生物及其金属配合物抗肿瘤生物活性国内外研究进展,主要包括吡唑啉酮衍生物及其金属配合物抗肿瘤生物活性,及其活性作用机制。展望了吡唑啉酮衍生物及其金属配合物抗肿瘤活性研究的发展方向。     

几种吡唑啉酮衍生物铜(Ⅱ)配合物的固、液相反应合成与表征

几种吡唑啉酮衍生物铜(Ⅱ)配合物的固、液相反应合成与表征;吡唑啉酮; 铜(Ⅱ)配合物; 固相反应     

芳酸偶氮吡唑啉酮及其麻黄碱盐的合成

近期报道了吡唑啉酮衍生物与稀土金属的络合作用。关于4-芳基偶氮吡唑啉酮与过渡金属络合的作用已有报道,但与稀土金属络合的文献不多。根据英国药典,麻黄碱与铜离子络合呈色而作为其鉴定方法,本文制备了麻黄碱类与芳酸偶氮吡唑啉酮形成的盐,以备研究它们的络合作用。在合成的5种吡唑啉酮衍生物中,本文利用PH     

2-氨基-4H-咪唑啉-4-酮衍生物的快速平行合成法

咪唑啉酮衍生物是一类具有良好生物活性和药理活性的杂环化合物 [1,2 ] ,尤其是一些 2 -氨基咪唑啉酮表现出良好的杀菌、抗炎及抗癌活性 [3 ,4 ] .从自然界如一些海洋生物中可分离得到含 2 -氨基咪唑啉酮结构的生物碱 [5,6] .最近 ,组合化学方法广泛地应用于有机合成 ,它包括固相合成法和液相合成法[7～ 9] .我们曾应用氮杂 Wittig反应制得 2 -氨基取代咪唑啉酮衍生物 ,部分化合物表现出一定的抑菌活性 [10 ,11] .本文进一步报道应用液相平行反应法快速合成 2 -氨基 - 4H-咪唑啉 - 4-酮衍生物 (4) .该方法应用烯基膦亚胺 1与苯基异氰酸酯的…     

几种新的4-酰代吡唑啉酮衍生物的合成与结构

利用4-酰代吡唑啉酮与氨基硫脲类化合物反应制备了新的吡唑啉酮类衍生物,并用IR,NMR,MS和元素分析进行表征,最后用X射线四圆衍射对其中的2个化合物进行了晶体结构测定。     

一种新的双吡唑啉酮化合物的合成及晶体结构

4-酰基吡唑啉酮是一类含有氮杂环的β-二酮型螯合剂,近几十年来,国内外对该类化合物及其衍生物进行了广泛的研究[1-3].本室验室曾合成了一系列4-苯甲酰基吡唑啉酮缩氨基硫脲及其衍生物,发现这类含硫席夫碱具有光致变色性,并对其变色机理和反应动力学进行了详细研究[4,5].作为工作的继续,我们又合成了1-苯基-3-甲基-4-乙酰基-5-吡唑啉酮缩硫甲基氨基硫脲(PMEP-MTTSC),虽然此化合物不具有光致变色性,但在培养其单晶的过程中,却意外地得到了一种双吡唑啉酮化合物.当用不同的溶剂来培养其单晶时,又得到了这种双吡唑啉酮的一对互变色异构体.反应过程如下:     

新型吡唑啉酮衍生物的制备

以氢氧化钾为催化剂,1-苯基-3-甲基-吡唑啉-5-酮与取代苯甲醛亚胺反应合成了新型1-苯基-3-甲基-吡唑啉-5-酮衍生物——1-苯基-3-甲基-4-(1-N-氯乙胺基-1-取代苯基)甲基-吡唑啉-5-酮,其结构经1H NMR,IR,MS和元素分析表征。     

新型吡唑啉酮衍生物的固相合成

以2-苯基-1,2,3-三唑-4-甲醛和3-甲基-1-苯基-5-吡唑啉酮为原料,采用微波辐射固相合成法,经Knoeve-nagel缩合反应制得3-甲基-1-苯基4-(2-苯基-1,2,3-三唑4-亚甲基)-5-吡唑啉酮(2);2与吲哚发生Michael加成反应合成了吡唑啉酮衍生物,其结构经1H NMR和IR确证.     

4-二甲氨基吡啶促进的一锅法合成高选择性螺环丙烷吡唑啉酮衍生物（英文）

发展了一种4-二甲氨基吡啶(DMAP)促进的高立体选择性合成多取代螺环丙烷吡唑啉酮的方法.该反应以吡唑啉酮、芳醛和溴乙酸酯为原料, DMAP作为碱,经三组分一锅反应,合成一系列收率高且非对映选择性好的目标化合物.该反应具有操作简单、产率高以及非对映选择性好等优点.该合成方法对于螺环丙烷的研究具有重要的价值.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.