新多取代吡啶类化合物的合成及生物活性

为寻找具有农用生物活性的新颖化合物,以2-氰基硫代乙酰胺为起始原料经由三步反应,设计并合成出了一系列新颖的多取代吡啶衍生物2-甲基-5-氰基-6-炔丙硫基-4-(2-呋喃基或噻吩基)吡啶-3-甲酸甲酯或乙酯和6-甲基-5-乙酰基-2-炔丙硫基-4-(2-呋喃或噻吩基)吡啶-3-乙腈.所有新化合物均经过1H NMR和元素分析确证.初步生物活性测定表明:化合物7有一定的除草和杀菌活性.     

4-(取代苯基)(2-氯吡啶-5-亚甲基)次膦酸脂肪醇酯的合成

4-(取代苯基)(2-氯吡啶-5-亚甲基)次膦酸脂肪醇酯的合成与生物活性;次膦酸酯;吡啶;合成;生物活性     

6-氯-3-吡啶甲基取代硫脲化合物的合成与生物活性

甲基吡啶;杀虫;植物生长调节活性;6-氯-3-吡啶甲基取代硫脲化合物的合成与生物活性     

1-苯基-3-甲基-5-芳氧基-1H-吡唑-4-甲醛-O-[(2-氯吡啶-5-基)甲基]肟的合成与生物活性

利用1-苯基-3-甲基-5-芳氧基吡唑4-甲醛肟与2-氯-5-氯甲基吡啶发生缩合反应,合成了14个新型含吡啶环的吡唑肟醚衍生物.通过1H NMR,13C NMR和元素分析对所合成的化合物进行了结构表征.初步生物活性测试结果表明,在试验浓度下部分化合物具有一定的杀菌和植物生长调节活性.     

N1-吡啶甲基-N-芳酰基脲衍生物的合成及生物活性

吡啶衍生物;N1-吡啶甲基-N-芳酰基脲衍生物的合成及生物活性     

新型含有苯并咪唑取代基的多取代吡啶类化合物及其配合物的合成与表征

以苯并咪唑查尔酮、吡啶盐在醋酸氨和冰醋酸中的混合物为原料,在微波作用下合成了一系列未见文献报道的多取代吡啶类化合物,并研究了具有代表性的化合物与金属离子的配位反应.通过IR,UV,1HNMR,13CNMR等方法进行了表征,并用单晶X-ray衍射法测定了一个配合物的单晶分子结构.     

新型三氟甲基吡啶类衍生物的合成及生物活性测试研究

新型三氟甲基吡啶类衍生物的合成及生物活性测试研究钱旭红，唐军，陈卫东，张荣，黄德音，倪长春，郭庆铭（华东理工大学农用化学品研究所，上海，２００２３７）（上海市农药研究所）关键词氟代物，吡啶，合成，生物活性，化学农药不少吡啶类化合物是有着广泛前途的生物...     

噻吩并[2,3-b]吡啶化合物的合成及应用

噻吩并[2;3-b]吡啶;生物活性;医药;农药;合成     

N-取代吡唑亚甲胺基-N＇-取代苯基(硫)脲的合成

硫脲;生物活性;N-取代吡唑亚甲胺基-N＇-取代苯基(硫)脲的合成     

吲哚取代10H—吡啶并[1,2—a]吲哚盐的合成

通过2,3,3-三甲基-3H-吲哚高氯酸盐与吲哚取代查耳酮或芳基乙烯基酮在异戊醇介质中反应,合成了15种新的10H-吡啶并[1,2-a]吲哚高氯酸盐,其结构用各种波谱确定,从结构上进一步推理提出了反应历程,并讨论了~1H NMR谱中取代基对吡啶环质子化学位移的影响。     

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.