中位取代苯硼酸的含稠合外环的硼-二吡咯亚甲基染料类单糖荧光探针的合成与性能

以环己烯为起始原料,首先经过两步改进的合成方法制备出2-乙氧羰基-3,4-四亚甲基吡咯,并用过量氢化铝锂将其高温还原得到2-甲基-3,4-四亚甲基吡咯,后者与被保护的4-甲醛基苯硼酸在三氟乙酸的催化作用下发生缩合反应,用2,3-二氯-5,6-二氰基-1,4-苯醌(DDQ)氧化并依次用三乙胺和三氟化硼-乙醚处理后,得到一种新型的中位取代苯硼酸的含稠合外环的硼-二吡咯亚甲基类(BDP)染料衍生物。 通过紫外-可见吸收光谱及荧光光谱滴定方法,研究了该染料在特定pH值下对D-果糖、D-半乳糖、D-葡萄糖等3种单糖的响应能力,上述3种单糖与BDP染料衍生物的键合既表现在吸收光谱上,也表现在荧光发射光谱上,并且通过对荧光滴定数据的非线性拟合分析,BDP染料衍生物1与D-果糖、D-半乳糖、D-葡萄糖的结合常数分别为1045、445和130 L/mol。 因此该染料衍生物作为单糖的荧光探针,具有灵敏度高、选择性较好等优点;另外,还初步探讨了该荧光探针的传感机理。     

新型硼-二吡咯亚甲基染料衍生物的合成及其光学性质

以无水乙醇为溶剂,1-硝基环己烯与异氰基乙酸乙酯在K2CO3催化下经Barton-Zard反应制得2-乙氧羰基-3,4-四亚甲基吡咯(3);用过量氢化铝锂高温还原3得2-甲基-3,4-四亚甲基吡咯(4);通过"一瓶三步骤"合成法,4与4-羟基-3-硝基苯甲醛在三氟乙酸催化下经缩合反应后,用2,3-二氯-5,6-二氰基-1,4-苯醌氧化并依次用NEt3和BF3·OEt2处理合成了一种新型的含稠合外环的中位取代4-羟基-3-硝基苯基亚单元的BDP类染料衍生物(7),其结构经1H NMR和元素分析表征。光学性质研究结果表明,7在氯仿中的最大吸收峰位于525 nm,496 nm和390 nm;7的吸收光谱特征与溶液pH无关,但其发射光谱在强极性溶剂中表现出较强的碱性依赖性,可作为碱性条件下的pH荧光探针;7与OH-以1∶1结合的结合常数Ks为1 579 L·mol-1,酸度常数pKa约为10.80。     

联二噻吩稠合的近红外BODIPY染料的合成与光谱性质

以叠氮乙酸乙酯和联二噻吩甲醛为原料,合成了联二噻吩并吡咯单体,之后在酸催化下与4-N,N-二甲基氨基苯甲醛缩合并与三氟化硼配位,得到一个新型的BODIPY染料SY。采用~1HNMR、质谱以及元素分析对其结构进行了表征。化合物SY在二氯甲烷中的最大吸收和发射波长分别为654和689nm;采用荧光光谱滴定方法研究了它对pH值的响应,酸性条件下N,N-二甲基苯氨基团发生质子化,抑制了光诱导电子转移对BODIPY母体的荧光淬灭,其溶液的荧光显著增强,染料SY可以作为近红外的pH值荧光探针。     

检测氢离子的荧光探针：含稠合外环的硼-二吡咯亚甲基染料的合成、光谱和电化学性质研究

本文合成了3个新型中位分别为N,N-二甲基苯胺、对-甲氧基苯基或苯基取代的含稠合外环的硼-二吡咯亚甲基染料。研究了它们的吸收光谱、稳态荧光光谱和电化学性质;采用荧光光谱滴定方法研究了它们在强极性溶剂中对氢离子的响应;将氢离子滴加到N,N-二甲基苯胺取代的硼-二吡咯亚甲基染料(1)的CH3CN-H2O(1∶1,V/V)溶液中,其溶液的荧光显著增强;染料1在可见光激发下,可以作为酸性pH范围内检测氢离子的荧光探针。     

联二噻吩稠合的近红外BODIPY染料的合成与光谱性质

以叠氮乙酸乙酯和联二噻吩甲醛为原料,合成了联二噻吩并吡咯单体,之后在酸催化下与4-N,N-二甲基氨基苯甲醛缩合并与三氟化硼配位,得到一个新型的BODIPY染料SY。采用¹H NMR、质谱以及元素分析对其结构进行了表征。化合物SY在二氯甲烷中的最大吸收和发射波长分别为654和689 nm;采用荧光光谱滴定方法研究了它对pH值的响应,酸性条件下N,N-二甲基苯氨基团发生质子化,抑制了光诱导电子转移对BODIPY母体的荧光淬灭,其溶液的荧光显著增强,染料SY可以作为近红外的pH值荧光探针。     

诺蒎酮基喹唑啉-2-胺型铜离子荧光探针的合成及其应用研究

以可再生的β-蒎烯衍生物诺蒎酮为原料,设计合成了一种新型的诺蒎酮基喹唑啉-2-胺铜离子荧光探针N-苄基-4-(4-(二乙氨基)苯基)-7,7-二甲基-5,6,7,8-四氢-6,8-桥亚甲基喹唑啉-2-胺(BNQ).探针BNQ在PBS/THF(V/V=8/2,10mmol·L-1,pH=7.4)溶液中对Cu2+表现出高度...     

基于硼-二吡咯亚甲基二聚体的红光三价铁离子探针的合成与性质

在硼-二吡咯亚甲基(BOIDPY)的β-β(2/6)位偶联得到一种新型的红光二聚体BODIPY荧光探针1,该探针可以发生高效的能量转移,假-斯托克斯位移可以达到222 nm。探针1能够专一性地识别三价铁离子,不受其它常见金属离子的干扰,可以作为检测三价铁离子的高选择性的探针。     

基于硼-二吡咯亚甲基二聚体的红光三价铁离子探针的合成与性质（英文）

在硼-二吡咯亚甲基(BOIDPY)的β-β(2/6)位偶联得到一种新型的红光二聚体BODIPY荧光探针1,该探针可以发生高效的能量转移,假-斯托克斯位移可以达到222 nm。探针1能够专一性地识别三价铁离子,不受其它常见金属离子的干扰,可以作为检测三价铁离子的高选择性的探针。     

BODIPY-吡咯类荧光染料的合成及光谱识别性能

采用Knoevenagel反应以氟化硼配位二吡咯甲川类荧光染料BODIPY(4,4-difluoro-4-bora-3a,4adiaza-s-indacene)为母体,经吡咯甲醛或杯吡咯甲醛合成了四个BODIPY荧光染料1a~1d,用MS,NMR和元素分析进行结构确证。考察了它们的紫外吸收光谱与荧光发射光谱,结果表明1a~1d具有较高的摩尔吸光系数,在BODIPY母环的3,5位双取代物(1c和1d)相对于单取代物(1a和1b)其最大吸收波长和发射波长分别红移了约90nm和80nm,说明BODIPY-吡咯衍生物中共轭程度增强,光谱出现红移。阴离子识别研究表明,1b和1d能够与Cl-形成多重氢键,导致吸收光谱红移和荧光猝灭。     

氟硼二吡咯亚甲基类荧光探针在离子检测中的应用进展

氟硼二吡咯亚甲基类(BODIPY)类化合物具有摩尔吸光系数高、荧光量子产率高、吸收波长在可见光或近红外区域、荧光寿命长和光稳定性好等特点,并且其荧光对溶剂的极性和pH均不敏感,是一类可应用于生物领域的荧光染料,近年来,此类化合物被广泛用于设计合成荧光传感器分子,用于各种离子的检测,此类荧光探针具有分析灵敏度高、选择性好等特点.综述了氟硼二吡咯亚甲基类荧光探针在离子识别和检测中的应用,并展望了该领域的前景.     

5-(S)-孟氧基-3,4-二卤-2(5H)-呋喃酮与4-硝基邻苯二胺的Michael加成―消除反应

在Et3N作为碱的温和条件下,5-(S)-孟氧基-3,4-二卤-2(5H)-呋喃酮与芳香胺4-硝基邻苯二胺发生串联的Michael加成―消除反应,生成了新的含有苯环结构的5-孟氧基-4-氨基-3-卤-2(5H)-呋喃酮类化合物。新化合物的结构通过紫外―可见光谱(UV-Vis)、红外光谱(IR)、质谱(MS)、核磁共振氢谱(1H NMR)、核磁共振碳谱(13C NMR)和元素分析等表征证实。该多环结构卤代2(5H)-呋喃酮化合物的合成,能为某些多官能团的结构复杂的2(5H)-呋喃酮化合物的合成提供新途径。     

Synthesis and Crystal Structure of Ethyl 3-（4-Chlorophenyl）-3,4-dihydro-6-methyl-4-oxo-2- （pyrrolidin-1-yl）furo[2,3-d]pyrimidine-5-carboxylate

The crystal structure of the title compound ethyl 3-（4-chlorophenyl）-3,4-dihydro-6- methyl-4-oxo-2-（pyrrolidin-1-yl）furo[2,3-d]pyrimidine-5-carboxylate （C20H20ClN3O4, Mr= 401.84） has been prepared and determined by single-crystal X-ray diffraction. The crystal is of monoclinic, space group P21/n with a = 20.6215（9）, b = 8.5311（4）, c = 21.6886（9） A^°, β = 91.607（1）°, V = 3814.0（3）A^°^3, Z = 8, Dc = 1.400 g/cm^3, F（000） = 1680, μ = 0.233 mm^-1, R = 0.0718 and wR = 0.1545 for 6717 observed reflections with I 〉 2σ（I）. X-ray diffraction analysis reveals two crystallographically independent molecules in the asymmetric unit.     

A novel series of vanadium-sulfite polyoxometalates: synthesis, structural, and physical studies

Reaction of NH4VO3 with sulfur dioxide affords the hexanuclear cluster (NH4)2(Et4N)[(V(IV)O)6(mu4-O)2(mu3-OH)2(mu3-SO3)4(H2O)2]Cl x H2O (1), and the decapentanuclear host-guest compound (Et4N)5{Cl subset [(VO)15(mu3-O)18(mu-O)3]} x 3 H2O (2). Sequential addition of magnesium oxide to an acidic aqueous solution of NH4VO3 (pH approximately 0) followed by (NH4)2SO3 resulted in the formation of either the non-oxo polymeric vanadium(IV) compound trans-(NH4)2[V(IV)(OH)2(mu-SO3)2] (3) or the polymeric oxovanadium(IV) sulfite (NH4)[V(IV)O(SO3)1.5(H2O)] x 2.5 H2O (4) at pH values of 6 and 4, respectively. The decameric vanadium(V) compound {Na4(mu-H2O)8(H2O)6}[Mg(H2O)6][V(V)10(O)8(mu6-O)2(mu3-O)14] x 3 H2O (5) was synthesised by treating an acidic aqueous solution of NH4VO3 with MgO and addition of NaOH to pH approximately 6. All the compounds were characterised by single-crystal X-ray structure analysis. The crystal structure of compound 1 revealed an unprecedented structural motif of a cubane unit [M4(mu4-O)2(mu3-OH)2] connected to two other metal atoms. Compound 3 comprises a rare example of a non-oxo vanadium(IV) species isolated from aqueous solution and in the presence of the reducing agent SO3(2-), while compound 4 represents a rare example of an open-framework species isolated at room temperature (20 degrees C). In addition to the synthesis and crystallographic studies, we report the IR and magnetic properties (for 1, 2 and 3) of these vanadium clusters as well as theoretical studies on compound 3.     

Synthesis and Crystal Structure of 〔Na(N-(p-chlorophenyl)aza-15-crown-5)-(Et_2O)〕_2 (Na_2W_(0.5)Mo_(7.5)O_(26))

1mThODUCnONThestudyofsupermolecularcomplexesofcrownetherringhasthrivedforyearsrecentlybecauseoftheirprobabilityprospectinmaterialscienceandlifescience,andtheirinterestingstereochemistrywhentheradiusofcavityofringischanged"'.Inthecourseofourinvestigationontherelationshipbetweenthesizeofthecrownetherringandthepolymerizationofpolyoxometalate,anovel'crystalofsupermolecularcomplexof[Na(N--(p--chlorophenyl)aza--15--crown--5)(Et,O)j2(Na,W,.5Mo,.5O,,)wasobtained.2EXPERIMENTALToasolutionofequ…     

Novel sulphur-rich BODIPY systems that enable stepwise fluorescent O-atom turn-on and H2O2 neuronal system probing

Bis-arylsulfide BODIPY systems were prepared and studied for multiple O-atom sensing (at 522 nm); 2- and 3-atom loading was optimal (50-fold, "turn on"). Neuronal studies showed greater H(2)O(2) sensitivity than 2',7'-dichlorofluorescein diacetate. The novel 1,3,6-trimethyl BODIPY formed as a biproduct under Lindsey conditions.     

Fluorescent proton sensors based on energy transfer

Photophysical data and orbital energy levels (from electrochemistry) were compared for molecules with the same BODIPY acceptor part (red) and perpendicularly oriented xanthene or BODIPY donor fragments (green). Transfer of energy, hence the photophysical properties of the cassettes, including the pH dependent fluorescence in the xanthene-containing molecules, correlates with the relative energies of the frontier orbitals in these systems. Intracellular sensing of protons is often achieved via sensors that switch off completely at certain pH values, but probes of this type are not easy to locate inside cells in their "off-state". A communication from these laboratories (J. Am. Chem. Soc., 2009, 131, 1642-3) described how the energy transfer cassette 1 could be used for intracellular imaging of pH. This probe is fluorescent whatever the pH, but its exact photophysical properties are governed by the protonation states of the xanthene donors. This work was undertaken to further investigate correlations between structure, photophysical properties, and pH for energy transfer cassettes. To achieve this, three other cassettes 2-4 were prepared: another one containing pH-sensitive xanthene donors (2) and two "control cassettes" that each have two BODIPY-based donors (3 and 4). Both the cassettes 1 and 2 with xanthene-based donors fluoresce red under slightly acidic conditions (pH < ～6) and green when the medium is more basic (>～7), whereas the corresponding cassettes with BODIPY donors give almost complete energy transfer regardless of pH. The cassettes that have BODIPY donors, by contrast, show no significant fluorescence from the donor parts, but the overall quantum yields of the cassettes when excited at the donor (observation of acceptor fluorescence) are high (ca. 0.6 and 0.9). Electrochemical measurements were performed to elucidate orbital energy level differences between the pH-fluorescence profiles of cassettes with xanthene donors, relative to the two with BODIPY donors. These studies confirm energy transfer in the cassettes is dramatically altered by analytes that perturb relative orbital levels. Energy transfer cassettes with distinct fluorescent donor and acceptor units provide a new, and potentially useful, approach to sensors for biomedical applications.     

Synthesis of (1H)-3,4-Dihydropyrrolo[2,1-c][1,4]oxazin-1-one Derivatives

It has been found that some acyl derivatives of 1,2,3,4-tetrahydro-1-indolizin-1-one 1and (1H)-3,4-dihydropyrrolo[1,2-a]pyrazin-1-one 2 show remarkable anti-inflammatory and analgesic activities1,2. The interest in extending the study of structure-activity relationships and search of new potent anti-inflammatory and analgesic agents led us to design and synthesize (1H)-3,4-dihydropyrrolo[2,1-c][1,4]oxazin-1-one 3 derivatives. NO 1 NNHO2 87654321ONO3 A few examples of the p…     

Synthesis and Crystal Structure of N—tert—butyl—N′—（2，4—dichlorobenzoyl）—N—[1—（4—chlorophenyl）—1,4—dihydro—6—methylpyridazine—4—oxo—3—carbonyl]hydrazine

1 INTRODUCTIONPyridazinone derivatives represent one of the most active classes of compounds possessing a wide spectra of biological activity. They are widely used in pharmaceuticals and agrochemicals[1,2]. Rohm- Haas Company had reported that N-tert-butyl- dibenzoylhydrazine exhibits excellent insecti- cides[3, 4] and t-butyl plays an important role in the insecticide activity [5]. In the previous paper, we had reported that 1-aryl-1,4-dihydro-3- acylhydrazino- carbonyl-4-one-6-methylpy…     

Synthesis and Crystal Structure of a New Mo/Au/S Cluster [Et4N][Mo2S4（AuPPh3）（edt）2]· 0.25Et2O·0.25MeOH （edt = Ethanedithiolate）

Reactions of the preformed cluster precursor [Et4N]2[Mo2S2（μ-S）2（edt）2] （edt = ethanedithiolate） （1） with [Au（PPh3）Cl] in MeOH/MeCN gave rise to a new heterobimetallic Mo/Au/S cluster [Et4N][Mo2S4（AuPPh3）（edt）2]·0.25Et2O·0.25MeOH （2·0.25Et2O·0.25MeOH）. It was characterized by elemental analysis, IR spectrum and X-ray analysis. 2·0.25Et2O·0.25MeOH crystallizes in the monoclinic system, space group C2/c with a = 20.117（4）, b = 9.2705（19）, c = 44.418（9） A^°, β= 93.19（3）°, V = 8271（3） A^°^3, Z = 8, Dc = 1.794 g/cm^3, T = 193 K, C31.25H43AuMo2NO0.50PS8, Mr = 1116.96, F（000） = 4380, μ（MoKa） = 4.603 mm^-1, S = 1.019, R = 0.0672 and wR = 0.1708 for 7243 observed reflections with I 〉 2σ（I）. The anion of 2 consists of a butterfly-shaped Mo2S4Au core in which one [AuPPh3]^＋ cation is coordinated by one bridging S and two terminal S atoms of the [（edt）2Mo2（S）2（μ-S）2] moiety. The Au（I） center adopts a pseudo-tetrahedral coordination geometry, and the Au-S bond lengths vary from 2.425（2） to 2.898（3）A^°.