电化学合成C-磺酰基化合物的研究进展

磺酰基化合物是一类重要的有机硫化合物,在医药、农药和功能材料等领域中均具有广泛的应用,因此,有效的磺酰基化合物的合成策略已成为化学工作者们广泛研究的热点.有机电化学合成是一种绿色、温和、高效的合成策略,其在磺酰基化合物的合成中显示出了巨大的潜力.本综述介绍了近年来利用电化学手段合成C-磺酰基化合物的反应.按照电化学合成C(sp)-磺酰基化合物、C(sp²)-磺酰基化合物以及C(sp³)-磺酰基化合物的反应进行了分类归纳讨论,并对相应的反应机理进行了阐述,为今后此类反应在有机合成中的应用提供参考.     

无金属条件下I2/TBHP体系促进磺酰肼与烯醇硅醚自由基偶联反应合成α-磺酰基酮

在以单质碘(I₂)为催化剂, 叔丁基过氧化氢(TBHP)为氧化剂条件下, 使烯醇硅醚与各种取代的磺酰肼发生自由基磺酰化反应, 经自由基加成和氧化反应, 再水解脱去三甲基碘硅烷(Me₃SiI), 在最优条件下, 以22%~72%的收率合成了22种具有不同取代基的α-磺酰基酮衍生物, 采用核磁共振波谱表征了终产物的结构. 实验结果表明, 该方法具有良好的底物普适性, 氟、 氯、 硝基、 三氟甲基、 呋喃和萘等取代基团均能顺利发生转化, 得到相应的目标产物.     

对-异菸酰肼磺酰基-苯甲醛缩氨基硫脲的合成

Domagk于1947年报告氨基硫脲类化合物具抗结核菌性能,并进而找出对-乙酰氨基苯甲醛缩氨基硫脲(p-Acetylaminobenzaldehyde thiosemicarbazone)有强大的抗结核菌效用。其后如TBⅢ等化合物的合成和介绍亦陆续见于文献中。本文由对-氯磺酰基苯甲醛二乙酯(p-chlorosulfonylbenzaldehyde diacetate)与异菸酰肼于吡啶溶液中作用,合成对-异菸酰肼磺酰基-苯甲醛二乙酯(p-isonicotinyl     

N－硫代磷酰基磺酰脲的合成及除草活性研究

Ｎ－硫代磷酰基磺酰脲的合成及除草活性研究金桂玉,赵国锋,郑健禺（南开大学元素有机化学研究所,天津,３０００７１）关键词硫代磷酰胺,Ｎ－硫代酰基磺酰脲,除草活性磺酰脲类化合物作为高效除草剂已得到广泛地应用和开发［１～７］．为寻找具有除草活性的新化合物,...     

1-苯甲酰-2-苯磺酰肼类化合物的合成

以苯磺酰肼为原料,在低温下滴加苯甲酰氯,方便地合成了7个1-苯甲酰-2-苯磺酰肼类化合物,收率40.3%～75.8%。其结构经1H NMR表征。     

4,5-二苯基-2-取代基-1-磺酰基咪唑的合成

用多种磺酰氯或磺酸酐与4,5-二苯基-2-取代-1-磺酰基咪唑负离子反应, 合成了10个未见文献报道的1-磺酰基咪唑类化合物. 所有化合物均经1H NMR和13C NMR确证.     

基于磺酰芳基肼的偶氮类染料的合成

偶氮化合物是一类非常重要的合成染料。本文应用N′-对甲基苯磺酰基芳基肼作为重氮源，在碳酸钾的促进下，与萘酚或N,N-二甲基苯胺在碳酸钾促进下发生偶联合成了系列偶氮类化合物，收率63%~85%，其结构经¹H NMR确证。     

N-呋喃酮基磺酰肼的合成与抗肿瘤活性研究

以5-甲氧基-3,4-二卤-2(5H)-呋喃酮和磺酰肼为原料,DMAP为催化剂,设计合成10个N-呋喃酮基磺酰肼类化合物(4a～4j),产率在75～92%之间,并通过~1H NMR对所有目标化合物进行了结构表征。采用MTT法测定目标化合物对人乳腺癌(MCF-7)、人神经胶质瘤(U87)、人肺癌(A549)细胞的体外抑制活性,结果显示部分目标化合物表现出较好的抗肿瘤活性,其中化合物4d效果最佳,对MCF-7、U87、A549的IC_(50)值分别达到7.33±0.36μmol·L~(-1)、5.68±0.28μmol·L~(-1)和17.09±0.23μmol·L~(-1)。     

含丹磺酰基树枝状化合物研究进展

含丹磺酰基树枝状化合物具有独特的发光性能和潜在的应用价值,在化学传感器、药物传输、光捕获天线材料、有机电致发光器件、纳米材料等领域有着广阔的应用前景,已经引起化学家们的广泛关注.综述了近年来含丹磺酰基树枝状化合物的研究进展,讨论了树枝结构对丹磺酰基荧光性质的影响,并展望了此类化合物良好的应用前景.     

4-(取代嘧啶-2-基)-1-芳磺酰基氨基脲化合物的合成与表征

以取代的苯磺酰肼与(取代嘧啶-2-基)-氨基甲酸苯酯在非亲核性碱存在下合成了12个4-(取代嘧啶-2-基)-1-芳磺酰基氨基脲化合物5和3个5与碱形成的有机盐5as, 5bs和5cs. 所有合成化合物均经过元素分析和¹H NMR的结构确证. ¹H NMR数据证明, 在5as～5cs中, 磺酰氨基脲起到提供质子的作用.     

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.