采用Miyaura反应合成新型邻菲啰啉衍生物

以2,9-二氯-1,10-邻菲啰啉-5,6-二酮为原料,与2-硝基丙烷反应得双酮被保护的2,9-二氯-5,6-O-异丙叉基-1,10-邻菲啰啉(2);2与频哪醇硼酸酯在PdCl2(dppf)催化下经Miyaure反应合成了新化合物———9,9'-二氯-5,6;5',6'-二(O-异丙叉基)-2,2'-联邻菲啰啉,其结构经1H NMR,IR和MALDI-TOF-Mass表征。     

新型邻菲啰啉衍生物的合成

以2-［2-（2-甲氧基乙氧基）乙氧基］乙基-4-甲基苯磺酸为原料,经2步反应制得中间体2,2′-【2,5-二｛2-［2-（2-甲氧基乙氧基）乙氧基］｝1,4-二（4,4,5,5-四甲基）-1,3,2-二氧硼基】苯（6）; 3-溴-1,10-邻菲啰啉和6经Suzuki偶联反应合成了一个新型的邻菲啰啉衍生物--3,3′-【2,5-二｛2-［2-（2-甲氧基乙氧基）乙氧基］｝-1,4-二（1,10-菲啰啉基）】苯,其结构经¹H NMR和MALDI-TOF-MS表征。     

一种1,10菲啰啉-5,6-二酮及其单肟的高效合成方法

1,10菲啰啉5,6二酮(2)与1,10菲啰啉5,6二酮单肟(3)作为稠杂环共轭配体,既具有良好的配位特性,又是重要的有机合成反应中间体。由化合物2和它的衍生物与金属离子形成的配合物可以用于抗肿瘤药物、DNA探针、非线性光学材料、超分子组装分子骨架、自旋交叉配合物等许多领域。化合物3则用于有机光致变色化合物螺噁嗪的合成。化合物2无法直接用氧化剂氧化1,10菲啰啉(1)得到。它最初是从化合物1用混酸硝化制备5硝基1,10菲啰啉的废水中分离得到的,产率1%。Amouyal等[1]改进此方法,将产率提高到20%。随着应用研究的需求,对它的合成研究一直没有间…     

一种1, 10-菲啰啉-5, 6-二酮及其单肟的高效合成方法

1,10-菲啰啉-5,6-二酮(2)与1,10-菲啰啉-5,6-二酮单肟(3)作为稠杂环共轭配体,既具有良好的配位特性,又是重要的有机合成反应中间体.由化合物2和它的衍生物与金属离子形成的配合物可以用于抗肿瘤药物、DNA探针、非线性光学材料、超分子组装分子骨架、自旋交叉配合物等许多领域.化合物3则用于有机光致变色化合物螺噁嗪的合成.     

菲啰啉吡咯的合成工艺改进

1,10-邻菲啰啉经硝化反应制得5-硝基-1,10-邻菲啰啉(1).以无水乙醇为溶剂,1与异氰基乙酸乙酯在K2CD3的催化下通过Barton-Zardon反应合成了一种稠合菲啰啉环并吡咯衍生物2.较佳的反应条件为:1 10mmol,n(1):n(异氰基乙酸乙酯):n(K2CO3)=1.0:1.0:1.1,于室温反应24...     

选择性响应Cu~(2+)、Ag~+及阴离子的菲咯啉-水杨醛荧光探针

在乙酸酐中用2,9-二甲基-1,10-菲咯啉与水杨醛缩合反应得到2,2′-(1E,1′E)-2,2′-(1,10-菲咯啉-2,9-二基)双(乙烯-2,1-二基)双(2,1-亚苯基)二乙酸酯(探针1);再将其进一步水解得到2,2′-(1E,1′E)-2,2′-(1,10-菲咯啉-2,9-二基)双(乙烯-2,1-二基)二苯酚(探针2)。经1H NMR、13C NMR、IR、MS表征,探针化合物为大共轭结构,发光性能良好。两种探针分别表现出对Cu2+、Ag+不同的荧光猝灭作用,探针2还能识别阴离子F-和AcO-,具有双功能离子检测性能。光谱滴定、等温滴定量热及质谱等测定了配合物组成、作用常数及热力学参数,探针与金属离子的配合为放热反应,作用比为2∶1。     

羟基取代菲并咪唑衍生物对低碳钢的缓蚀性能

通过分子设计,增大邻菲罗啉平面结构,在不同位次引入-OH,合成2-(2-羟基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(2HIP)、2-(3-羟基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(3HIP)和2-(4-羟基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(4HIP)等三种羟基取代菲并咪唑衍生物。采用失重法、电化学法以及扫描电镜等研究其在1mol·L^-1HCl溶液中对低碳钢的缓蚀性能。三种缓蚀剂在低碳钢表面服从Langmuir吸附,缓蚀效率在实验浓度范围内均超过了90%,且4HIP具有最好的缓蚀效果,最高缓蚀效率为96.36%。DFT理论计算探讨了三种缓蚀剂分子结构与缓蚀剂效率关系,理论计算与实验结果具有一致性。     

新型2-(2-羧基苯基)咪唑[4,5-f][1,10]邻菲咯啉的合成及其荧光性能

以1,10-邻菲咯啉和邻羧基苯甲醛为原料,经氧化和缩合反应合成了一种新型的桥连配体——2-(2-羧基苯基)咪唑[4,S-f][1,10]邻菲咯啉(1),其结构经1H NMR,IR,MS和元素分析表征.用FL研究了1的荧光性能,结果表明,1具有较强的荧光,发光纯度较好.     

新型2-取代苯基-1H-咪唑[4,5-f][1,10]邻菲啰啉基Ru(II)配合物的光电性质

为获取具有活性官能团的接枝型、高性能荧光传感配合物,合成了2-(4-氨基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(CImPB-NH2)、2-(4-羟基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(CImPB-OH)、2-(4-羧基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(CImPB-COOH)和2-(4-硝基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉(CImPB-NO2)四种配体,借助紫外-可见(UV-Vis)吸收光谱、荧光(PL)光谱、循环伏安法(CV)和含时密度泛函理论(TD-DFT)对上述四种配体与过渡金属元素钌(Ru)所形成的配合物的光电性能进行研究.结果表明:四种配合物均在可见光区域有较强吸收,发光范围覆盖绿色到红色光波段.在极性溶剂N,N-二甲基甲酰胺(DMF)中,以2-(4-氨基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉为配体所构建的钌配合物([Ru(CImPB-NH2)(bpy)2]2+的荧光量子产率(Φ)较不含咪唑环的5-氨基邻菲啰啉合钌([Ru(phen-NH2)(bpy)2]2+)的提高了67%,以2-(4-羧基苯基)-1H-咪唑[4,5-f][1,10]邻菲啰啉所构建的钌配合物([Ru(CImPB-COOH)(bpy)2]2+)的Φ可达29.8%,是[Ru(phen-NH2)(bpy)2]2+的18倍.理论计算表明:配体中取代苯环、咪唑环和邻菲啰啉的稠环共平面,形成共价大π体系,其有效共轭长度较邻菲啰啉母体有显著增加,配合物是以Ru为中心的近似八面体构型,理论计算的电子吸收光谱和跃迁性质与实验结果相一致.上述研究有可能为接枝型、高性能荧光传感配合物的设计和筛选提供实验依据.     

纳米二氧化钛催化二苯并1,10-菲咯啉衍生物的合成研究

首次报道了纳米TiO_2催化1,2-环己二酮与2-氨基苯甲酰衍生物的串联Friedlander反应,合成了9个二苯并1,10-菲咯啉的衍生物(3a~3i),其中3b,3c,3e~3g和3i为新化合物,其结构经~1H NMR,~(13)C NMR和HRMS(ESI)表征。以6,7-二氢-5,8-二苯基苯并[1,10]菲咯啉(3a)的合成为例,对反应条件进行了优化。最佳反应条件为:锐钛型纳米二氧化钛用量为0.2 eq.,1a与2投料比为2.1∶1,乙腈为溶剂,于80℃反应7 h,收率83%。并对反应机理进行了探讨。     

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%.     

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.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

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.