一种新型铜离子荧光分子探针的合成与性能研究

设计合成了一种新型的以二苯乙烯为荧光团、双(2-吡啶甲基)胺(DPA)为识别基团的铜离子荧光分子探针(E)-4-(4-(双吡啶甲基胺)苯乙烯基)氰基苯(1),其结构用UV,IR,1H NMR,13C NMR和GC/MS进行了表征,并考察了其荧光性能.结果表明该荧光分子探针在CH3CN/H2O(1/9,V/V)溶液中,能...     

A fluorescence enhanced probe for sulfur dioxide detection and fluorescence imaging in living cellsEI北大核心CSCD

基于香豆素和苯并吡啶基团,构建了用于二氧化硫(SO_(2))高效检测的荧光探针P1,其化学结构通过核磁氢谱(^(1)H NMR)、碳谱(^(13)C NMR)和高分辨质谱(HR-MS)确证。在缓冲溶液体系中,单独的探针P1具有微弱的荧光,识别SO_(2)后荧光发射强度明显增强,能够实现对SO_(2)的专一性裸眼识别,检出限为126 nmol/L。生物应用实验结果表明,该探针具有较低的细胞毒性,可用于生物活细胞中外源性SO_(2)的荧光成像。     

新型吡唑啉酮稀土配合物的合成及荧光性能

通过分子设计,以吡啶-2,6-二甲酸为起始原料,合成了一种新型双吡唑啉酮吡啶配体:2,6-二(1-苯基4-乙氧羰基-5-吡唑啉酮-3-基)吡啶(H2L)。配体与稀土Eu(Ⅲ)和Tb(Ⅲ)离子成功螯合形成配合物。配体和配合物经FT-IR,1H NMR和元素分析进行表征,并确定配合物组成为RE2L3.4H2O。对配合物的紫外吸收和光致发光性能进行了检测,结果显示Eu(Ⅲ)和Tb(Ⅲ)离子能够有效地被有机配体敏化,发射出高亮、半峰宽狭窄的单色光。研究表明目标配合物能够成为优秀的发光材料。     

新型混配配合物双(3,5-二甲基吡唑)和2,6-吡啶二甲酸合锌的合成及其晶体结构

合成了新型混配配合物双(3,5-二甲基吡唑)和2,6-吡啶二甲酸合锌(1),其结构经1H NMR,IR和元素分析表征.x-射线单晶衍射分析结果表明.1属单斜晶系,空间群C2/c,晶胞参数a=13.976(5)A,6=9.541(3)A,c =14.238(7)A,a =90.000°,β=111.386(3)°,γ=9...     

非洛地平原药中相关杂质的合成

根据杂质产生的机理,模拟杂质产生的条件,合成了欧盟药典7.8所载非洛地平的3种杂质———2,6-二甲基-4-(2,3-二氯苯基)-3,5-吡啶二甲酸甲乙酯(1),2,6-二甲基-4-(2,3-二氯苯基)-1,4-二氢-3,5-吡啶二甲酸二甲酯(2)和2,6-二甲基-4-(2,3-二氯苯基)-1,4-二氢-3,5-吡啶二甲酸二乙酯(3),其结构经1H NMR和MS确证。1~3的合成,为非洛地平生产、检验、贮存过程中对杂质的控制提供了依据。     

一种含三苯胺基团的席夫碱的合成及其光学性能

以4-吡啶甲醛和4-(N,N-二苯胺基)苯胺为原料,合成了一种含三苯胺基团的席夫碱4-吡啶甲醛-N-(4-苯）二苯胺(III),其结构经¹H NMR, ¹³C NMR, IR, MS（ESI）和元素分析确证。采用UV-Vis研究了III的光学性能。结果表明:III 在二氯甲烷,乙酸乙酯,乙醇,乙腈和DMF中的λ_max均位于293 nm 和400 nm 附近。     

荧光猝灭型硼氟二吡咯类Cu2+探针的合成及其生物细胞成像的应用

设计合成了一个反应型的硼氟二吡咯(BODIPY)类荧光探针1,该探针以吡啶-2-羧酸苯酚酯基为识别基团。通过~1H NMR、~(13)C NMR和HRMS表征了1的结构,并解析了其晶体结构。光谱分析实验结果显示,探针1具有高的荧光量子产率(0.79),对Cu~(2+)具有较强的选择性识别性能,并能成功应用到生物细胞中Cu~(2+)的成像检测。     

多齿配体吡啶-2,6-双酰胺对Cr(Ⅲ)和Zn(Ⅱ)离子光谱识别性能研究

以吡啶-2,6-二甲酸为原料,通过酯化和酰胺化反应制备得到多齿配体吡啶-2,6-二[N-(1’-甲基-2’-羟乙基)酰胺],并利用紫外-可见光谱分析方法研究了该配体对于重金属Cr~(3+)和Zn~(2+)离子识别性能。结果表明,该配体对于重金属Cr~(3+)和Zn~(2+)离子具有较高的选择性识别能力,并且不受其他金属离子的干扰。     

瓜环与4,4'-二氨基二苯甲烷衍生物的相互作用

合成了三种长链多芳环多胺基客体,它们分别由三种醛基吡啶异构体与4,4'-二氨基二苯甲烷形成的Schiff碱还原而成,并得到1H NMR以及质谱分析方法表征证实.以核磁共振技术、紫外吸收光谱分析方法以及滴定1H NMR方法为研究手段,对瓜环(cucurbit[n]urils,n=6～8)分别与三种4,4'-二[N-(吡啶甲基)氨基]二苯甲烷盐酸盐相互作用进行了考察.实验结果表明,六元瓜环与三种4,4'-二[N-(吡啶甲基)氨基]二苯甲烷盐酸盐相互作用均形成物质的量之比为2∶1的哑铃型包结配合物;八元瓜环与三种N,N'-二(N-(吡啶甲基)二苯甲烷盐酸盐相互作用形成以类轮烷结构为主的包结配合物;七元瓜环与三种N,N'-二(N-(吡啶甲基)二苯甲烷盐酸盐相互作用存在多种模式的竞争.     

吡啶-2,6-二甲酰胺衍生物Tb(Ⅲ)、Eu(Ⅲ)配合物的制备及荧光性能测试

从吡啶-2,6-二甲酸(L1)出发,合成了2种含有多个共轭体系和多齿的N2,N6-二(3-甲基吡啶)-2-取代吡啶-2,6-二甲酰胺(L2)配体和N2,N6-二对甲苯基吡啶-2,6-二甲酰胺 (L3) 配体;制备了化合物N2,N6-二(3-甲基吡啶)-2-取代吡啶-2,6-二甲酰胺(L2)与Tb(Ⅲ)和Eu(Ⅲ)的配合物,培养出了单晶.通过红外光谱、元素分析和X射线单晶衍射仪确定配合物的组成和结构.结果表明:在Tb(Ⅲ)配合物的稀溶液中,当溶液pH值为7时荧光强度最强,pH值大于或小于7荧光强度都逐渐减弱;当溶液pH为7时,N2,N6-二(3-甲基吡啶)-2-取代吡啶-2,6-二甲酰胺对Tb(Ⅲ)的荧光强度敏化远大于吡啶-2,6-二甲酸;N2,N6-二(3-甲基吡啶)-2-取代吡啶-2,6-二甲酰胺和吡啶-2,6-二甲酸与Eu(Ⅲ)形成稀的配合物溶液的荧光强度随pH值的增加而增大(pH 3～11).     

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.     

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.     

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.     

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.