一系列烷基对二烷氧基苯在不同硝化体系中反应的研究

２－烷基－１，４－二甲氧基苯１ａ－ｄ（烷基为ＣＨ３，ＣＨ３ＣＨ２，ＰｈＣＨ２，（ＣＨ３）３Ｃ）分别在ＨＮＯ３－ＨＯＡｃ和ＮＨ４ＮＯ３－ＨＯＡｃ中反应后生成占绝对优势的硝化产物２－烷基－５－硝基－１，４－二甲氧基苯４ａ－ｄ，而２－烷基－５－叔丁基－１，４－二甲氧基苯２ａ－ｄ及２，５－二叔丁基－１，４－二苄氧基苯３在上述二种硝化体系中的反应在很大程度上取决于所用的硝化体系的性质及反应物的结构。对上述反     

dl—2,3—二氰基—2,3—二（3,4—二甲氧基苯基）丁二酸二乙酯的晶体和分…

用Ｘ射线晶体结构分析法测定和分析了ｄｌ－２，３－二氰基－２，３－二（３，４－二甲氧基苯基）丁二酸二乙酯的分子结构和晶体结构。晶体学数据为：Ｃ２６Ｈ２８Ｎ２Ｏ８，Ｍｒ＝４９６．５２，空间群Ｐ１，ａ＝１２．０４７（１），ｂ＝１３．２７１（１），ｃ＝８．７２８（２）Ａ，ａ＝９０．７１（１），β＝１０８．８１（１），γ＝８４．８７（１）°，Ｖ＝１３１５．４（２）Ａ＾３，Ｚ＝２，Ｄｃ＝１．２５４ｇ／ｃｍ＾３     

2,4—二羟基—3—芳氨基甲基苯乙酮和8—乙酰基—3—芳基—3,4—二…

研究了在氯化氢－乙醇溶液或乙醇溶液中，２，４－二羟基苯乙酮与甲醛和芳胺的Ｍａｎｎｉｃｈ反应，分别得到了５个２，４－二羟基－３－芳氨基甲基苯乙酮和５个８－乙酰基－３－芳基－３，４－二氧－５－羟基－２Ｈ－１，３－苯并恶嗪新化合物，用元素分析，ＩＲ，ＨＮＭＲ，ＭＳ，ＵＶ确定了它们的结构，并成功地实现了２，４－二羟基－３－芳氨基甲基苯乙酮和８－乙酰基－３－芳基－３，４－二氢－５羟基－２Ｈ，１，３－苯并恶嗪     

2—芳基—5—巯基—1,3,4—三唑衍生物的合成

报道了７种双（２－芳基－１，３，４－三唑－５－基）二硫化物（２ａ￣２ｇ）和５种１－乙基－２－芳基－１，３，４－三唑－５－乙硫醚的合成。化合物结构经元素分析、红外光谱、核磁共振氢谱及质谱确证。生物活性测定结果表明，２ｂ和３ｂ具有较强的抗菌活性。     

磷杂螺环化合物的合成——3,9—二氢—3,9—二硫代—2,4,8,10—…

本文合成了３，９－二氢－３，９－二硫代－２，４，８，１０－四氧杂－３，９－二磷杂螺环－［５，５）十一烷２，研究了２在Ｎ，Ｎ－二甲基乙酰胺介质中，在氢化钠作用下与α－芳基－β－硝基烯的加成反应，得到５个新的加成产物３ａ－ｅ，对２及加成物３ａ－ｅ的＾１ＨＮＭＲ谱进行了归属，并得到元素分析和ＩＲ的证实。     

2—氯／2—甲磺酰基—5—（2—苯基—4—喹啉基）—1,3,4—恶二唑…

借处理２－羟基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑同ＰＣｌ５／ＰＯＣｌ３之间的反应合成了２－氯－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑（３）和通过２－Ｙｕ基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑的甲基化，然后氧化制得２－甲磺酰基－５－（２－苯基－４－喹啉基）－１，３，４－恶二唑（６）。并分别研究了３和６同胺、叠氮及肼的反应，得到２，５－二取代的恶二唑新衍生物。初     

α—羰基烯酮环二硫代缩醛化学：XXI：β,β—1,3—亚丙二硫基—α,β—不饱和酮？

在乙醇为溶剂，乙醇钠为碱的条件下，标题类化合物１ａ～ｃ，３ａ，４ａ与胍缩合反应生成相应的嘧啶类化合物２ａ～ｃ，３ｂ，３ｃ，４ｂ。在以ＤＭＦ为溶剂，乙醇钠为碱的条件下，化合物１ａ与胍反应可生成２－氨基－４－二甲氨基－６－苯基嘧啶２ａ，该缩反应的特点为标题类化合物与胍缩合生成嘧啶类化合物的同时，将乙氧基或二甲氨基引入嘧啶环的确定位置，２ａ，２ａ，３ｂ，３ｃ，４ｂ为新的嘧啶在化合物。     

桥联双（2—巯基—5—甲基—1,3,4—噻二唑）化合物及其配合物的合成和表征

通过２－巯基－５－甲基－１，３，４－噻二唑（１）与二溴乙烷（２ａ）或低聚乙二醇二溴化物（２ｂ￣２ｄ）反应，合成了四个新型非环中性离子配体低聚醚（３ａ￣３ｄ）及其与汞、钯形成的８个配合物。通过元素分析，ＵＶ，ＩＲ及＾Ｈ ＮＭＲ对它们的结构进行了表征。     

1,3,3a,5—四苯基—3a,4,5,11—四氢—3H,6H—1,2,4—三唑并（ …

通过２，４－二苯基－２，３－二氢－１Ｈ－１，５－苯并二氮杂Ｚｕｏ与苯甲酰氯苯腙的（２＋３）环加成反应制备了标题化合物，用Ｘ射线单晶衍射仪测定了其晶体结构，晶体属正交晶系，空间群为Ｆｄｄ２．晶胞参数；ａ＝１．７６２８（４）ｎｍ，ｂ＝５．７５１２（１２）ｎｍ，ｃ＝１．０２２７ｎｍ，Ｖ＝１０．３６８（５）ｎｍ＾３，Ｚ＝１６，Ｄｃ＝１．２６２ｇ．ｃｍ＾－３，μ＝０．０７５ｍｍ＾－１，Ｆ（０００）＝４１６０     

3—羟基异恶唑的O—和N—酰化及其区域选择性研究 Ⅱ.3—羟基—5—甲基…

本文研究了不同反应条件下３－羟基－５－甲基异恶唑（１）与３－甲基－２－对氯苯基丁酰氯（２ａ）的反应，提出了区域选择性合成Ｏ－和Ｎ－酰化产物的方法。在三乙胺存在下，乙腈为溶剂，１和２ａ～２ｅ反应得到含量为８８～９６％的Ｏ－酰化产物３ａ～３ｅ；而若将１转化为相应的异恶唑硅醚４，再与２ａ～２ｉ反应，则得到含量为８６～９７％的Ｎ－酰化产物５ａ～５ｉ。试验表明，在ＤＭＡＰ催化下，３ａ和５ａ可发生Ｏ－／Ｎ－酰     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.