2,6—二烷基吡啶类化合物的合成

在金属的钠的作用下，通过２，６－二甲基吡啶侧链的烃基化合反应，合成了９个新的２，６－二烷基吡啶化合物，化合物的结构经元素分析，ＭＳ，ＩＲ，＾１ＨＮＭＲ及ＵＶ分析确证。     

3－氨甲基吡啶树脂的合成及五种氨基吡啶树脂对金铂吸附性的比较

研究了反应物配料比３－ＡＭＰ／Ｃｌ（摩尔比）、反应温度与时间对大孔型３－氨甲基吡啶树脂（３—ＡＭＰＲ）性能的影响规律．在最佳合成工艺条件下制得３－ＡＭＰＲ的功能基含量为３．１６ｍｍｏｌ／ｇ树脂．３－ＡＭＰＲ对ＡｕＣｌ６（２－），ＰｔＣｌ６（２－），ＩｒＣｌ６（２－），ＰｄＣｌ４（２－），ＲｈＣｌ６（３－）的吸附容量分别为８００．８，３８７．８，３８６．３，１３３．０，１０５．５ｍｇ金属／ｇ树脂；配位比分别为１．２９，０．６３，０．６４，０．４０，０．３３。比较了３—ＡＭＰＲ、２－ＡＭＰＲ、４－氨基吡啶树脂（４－ＡＰＫ）、３—ＡＰＲ、２－ＡＰＲ五种树脂对ＡｕＣｌ４－、ＰｔＣｌ６（２－）的吸附性，其中３－ＡＭＰＲ为最佳。     

乙酰基二茂铁2，6－吡啶二甲酰基腙的合成及其与Zn（Ⅱ）的配位行为

本文利用乙酰基二茂铁与２，６－吡啶二甲酰肼的缩合反应，首次合成了乙酰基二茂铁２，６－吡啶二甲酰基腙（Ｈ_２Ｌ），在甲醇溶液中得到了它与醋酸锌的固态配合物，其组成为Ｚｎ_２Ｌ（ＣＨ_３ＣＯＯ）_２·８Ｈ_２Ｏ．用摩尔比法测定了Ｈ_２Ｌ与Ｚｎ（Ⅱ）的配位比，结果表明与固态配合物中Ｈ_２Ｌ与Ｚｎ（Ⅱ）的配位比相吻合。     

多联吡啶螯合物反相高效液相色谱法分离测定铜(Ⅱ)、钴(Ⅱ)、汞(Ⅱ)

以三联吡啶衍生物６，６”－二甲基－４＇－苯基－２，２＇：６＇，２”－三联吡啶（ＴＰＹ）作柱前显色剂，于ＡｃｃＱ－Ｔａｇ柱上，用内含２．０×１０～（－６）ｍｏｌ／Ｌ ＴＰＹ和０．６ ｍｏｌ／Ｌ　ＮａＡｃ－ＨＡｃ缓冲溶液（ｐＨ＝３．５）的甲醇－水溶液（５５：４５，Ｖ／Ｖ）作流动相，流速为１．０ ｍＬ／ｍｉｎ，并以紫外－可见检测器于３１０ｎｍ处进行检测，开发了一种 ＲＰ－ＨＰＬＣ法同时分离测定铜（Ⅱ）、钴（Ⅱ）、汞（Ⅱ）的方法。该方法简便快速，灵敏度高，对于铜、钴、汞的检测限分别是０．００２０、０．００５５和０．００４０ｍｇ／Ｌ。用于实际样品测定，结果满意。     

铕和镧与吡啶－2，6－二甲酸配合物的NMR研究

合成了稀土铕、镧与吡啶－２，６二甲酸形成的二元配合物及铕与邻菲罗啉和吡啶－２，６二甲酸形成的三元配合物。经元素分析确定该配合物的组成分别为二元：Ｎａ３［Ｅｕ（ＤＰＣ）３］·２Ｈ２Ｏ，Ｎａ３［Ｌａ（ＤＰＣ）３］·２Ｈ２Ｏ；三元：ＮａＥｕ（ＤＰＣ）２·ｐｈｅｎ·４Ｈ２Ｏ。用核磁共振研究了配体与稀土的配位方式，讨论了诱导效应、屏蔽效应及稀土离子的顺磁性对配合物化学位移和ＮＭＲ谱图的影响。ＮＭＲ研究表明，三种配合物具有相似的对称结构和相同的化学位移变化规律。吡啶－２，６二甲酸中的羧酸以单齿配位（整个分子为三齿配位），二元配合物中，铕和镧的配位数均为９，三元配合物中，铕的配位数最低为８。     

吡啶－2，6－二甲酸镧钇异核配合物的合成及晶体结构

合成了吡啶－２，６－二甲酸镧钇异核配合物晶体。元素分析结果表明，化学式为ＬａＹ（ＨＤＰＡ）＿２·（ＤＰＡ）＿２．１２Ｈ＿２Ｏ，ＤＰＡ为吡啶－２，６－二甲酸根。用Ｘ射线衍射法测定了配合物的单晶结构，其结构式为［ＬａＹ（ＨＤＰＡ）＿２（ＤＰＡ）＿２（Ｈ＿２Ｏ）＿４」·８Ｈ＿２Ｏ，属单斜晶系，Ｐ２＿１／ａ空间群。晶胞参数：ａ＝１．２９７５（４）ｎｍ，ｂ＝１．１２６６（３）ｎｍ，ｃ＝１．４０７９（３）ｎｍ；β＝１０２；１５（２）°，Ｖ＝２．０１１９０（１）ｎｍ￣３，Ｚ＝４，Ｄｃ＝１．８３ｇ／ｃｍ￣３，稀土离子的配位数为９，其配位多面体为扭曲的三冠三角棱柱体。     

2－取代氨基－4，6－二氯嘧啶类化合物的合成及其杀菌活性

以４，６－二氯嘧啶－２－异氰酸酯与胺类、肼类及醇类化合物反应，合成了１８个未见文献报道的标题化合物。它们的结构经ＩＲ、１ＨＮＭＲ证实。其中苯硫甲基磺酰脲类化合物有较好的杀菌活性。     

含吡啶环联苯型[33]环系和含中心功能基[22]环系冠醚化合物的合成

以２，６－二溴甲基吡啶、４－甲基－２，６－二溴甲基苯甲醚为前体分别与２，２′－二羟基联苯反应合成新型的含吡啶环联苯型［３３］环系和含中心功能基［２２］环系冠醚化合物。其结构经元素分析、ＩＲ、１ＨＮＭＲ、ＭＳ等确证     

吡啶－2，6－二甲酸钪配合物［Sc（HDPA）（DPA）（H_2O）_2］·5

在水溶液中合成了吡啶－２，６－二甲酸抗配合物的晶体，元素分析结果表明，可用Ｓｃ（ＨＤＰＡ）（ＤＰＡ）·７Ｈ＿２Ｏ表示，用Ｘ射线衍射方法测定了配合物的单晶结构，其结构式为［Ｓｃ（ＨＤＰＡ）（ＤＰＡ）（Ｈ２Ｏ）２］·５Ｈ２Ｏ。晶体属正交晶系，空间群为Ｐｎ２１ａ。晶胞参数如下：ａ＝１．０１６９（２）ｎｍ，ｂ＝１．０１７２（２）ｎｍ，ｃ＝２．０２５４（４）ｎｍ；Ｖ＝２．０９５（１）ｎｍ３，Ｚ＝４，Ｄ＝１．５９ｇ／ｃｍ３。抗离子的配位数为８，其配位多面体为三角十二面体。     

2,6-氯吡啶的定向合成及结构测定研究

２，６－氯吡啶的定向合成及结构测定研究赵增国张和王桂林郝金库（天津师范大学化学系３０００７４）关键词吡啶氯代吡啶光氯化氯代吡啶是重要的农药、医药中间体。通常２－氯吡啶和２，６－二氯吡啶的合成是用吡啶和氨基钠进行齐齐巴宾反应，生成的氨基吡啶再进行重氮化...     

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.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

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.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.