双核钌-DMBA双芳香炔化合物的合成和电化学性质

在弱碱性条件下,双核钌(III)配合物Ru₂（DMBA）₄（NO₃）₂（DMBA=tetrakis-N,N''-dimethylbenzamidinate）与不同芳香炔反应（其中芳香基团包括：NAP^me,N-甲基-1,8-萘二甲酰亚胺;NAP^iso,N-异丙基-1,8-萘二甲酰亚胺;Naphth,萘;Ant,蒽）,制备了相应的端基炔取代配合物trans-Ru₂（DMBA）₄（C₂Ar）₂（Ar=NAP^me,1;NAP^iso,2;Naphth,3;Ant,4）。利用X射线晶体衍射测定了它们的结构。所有化合物的Ru-Ru键长处于单键范围（0.2450~0.2491 nm）,它们均是抗磁性物质。进一步通过¹H NMR和UV-Vis-NIR光谱进行了表征。电化学研究表明,所有化合物显示出与芳香基团有关的2个可逆的单电子氧化还原过程（包括一个氧化过程和一个还原过程）。     

双核钌-DMBA双芳香炔化合物的合成和电化学性质（英文）

在弱碱性条件下,双核钌(Ⅲ)配合物Ru2(DMBA)4(NO3)2(DMBA=tetrakis-N,N′-dimethylbenzamidinate)与不同芳香炔反应(其中芳香基团包括:NAPme,N-甲基-1,8-萘二甲酰亚胺;NAPiso,N-异丙基-1,8-萘二甲酰亚胺;Naphth,萘;Ant,蒽),制备了相应的端基炔取代配合物trans-Ru2(DMBA)4(C2Ar)2(Ar=NAPme,1;NAPiso,2;Naphth,3;Ant,4)。利用X射线晶体衍射测定了它们的结构。所有化合物的Ru-Ru键长处于单键范围(0.245 0~0.249 1 nm),它们均是抗磁性物质。进一步通过1H NMR和UV-Vis-NIR光谱进行了表征。电化学研究表明,所有化合物显示出与芳香基团有关的2个可逆的单电子氧化还原过程(包括一个氧化过程和一个还原过程)。     

基于1,4-双(咪唑-1-基)苯的Mn(Ⅱ)/Co(Ⅱ)配位聚合物的合成、晶体结构及性质

在溶剂热条件下,合成了3个新的配位聚合物{[Mn₃（oba）₃（bib）（DMF）（H₂O）]·DMF}_n（1）、[Co（Hoba）₂（bib）]_n（2）和{[Co（aip）（bib）]·DMF}_n（3）（bib=1,4-双（咪唑-1-基）苯,H₂oba=4,4''-二苯醚二甲酸,H₂aip=5-氨基间苯二甲酸,DMF=N,N-二甲基甲酰胺）,分别用元素分析、红外光谱、紫外可见光谱、热重分析、X射线单晶衍射、粉末X射线衍射对其进行了表征。结构分析表明：配合物1呈现三维网络结构,拓扑符号为{3¹⁸;4³⁷;5²⁴;6¹²}{3⁹;4¹²;5²;6³;7²}{3⁹;4¹²;5³;6⁴};配合物2的一维链通过O—H…O氢键连结成三维超分子,拓扑结构为{10}{8;10⁴;14}{8³}₂;配合物3的二维层状结构通过N—H…O氢键连成三维超分子,拓扑结构为{3³;4¹⁰;5;6}。配合物1能快速从染料混合物中选择性吸附刚果红。配合物2和3分子内Co（Ⅱ）离子之间存在弱的反铁磁相互作用。     

O—P—O桥联锰-席夫碱配合物的合成、结构和磁性质

采用溶液法合成了2例由O—P—O单元桥联的锰-席夫碱(SB)新型三核配合物,即[Mn₃(salen)₃(L)]ClO₄·H₂O (1)和[Mn₃(salpn)₃(L)]ClO₄(2),其中salen^2-=N,N''-乙二胺缩双水杨醛,salpn^2-=N,N''-丙二胺缩双水杨醛,H₂L=(5-(乙氧基羰基)萘-1-基)膦酸。通过单晶X射线衍射、红外光谱、粉末X射线衍射对其进行了表征。配合物1和2是同构的,均是由膦酸酯配体中的O—P—O桥联3个[Mn (SB)]+构成一个三核结构单元[Mn3(SB)3(L)]⁺,一个无序的ClO₄^-作为平衡阴离子存在。这些[Mn₃(SB)₃(L)]⁺三聚体通过π-π相互作用和相邻的分子形成超分子一维波形链。配合物1和2的磁性研究表明,不对称结构中的3个Mn(Ⅲ)离子分别是2个高自旋和1个低自旋,而Mn(Ⅲ)离子之间主要存在反铁磁相互作用。     

两个三环己基锡芳香羧酸酯的合成、结构、热稳定性及体外抗癌活性研究

甲醇中三环己基氢氧化锡分别与呋喃-2-甲酸、2,4,6-三甲基苯甲酸反应,合成了2个三环己基锡芳香羧酸酯Cy₃SnO₂CC₄H₃O（1）和Cy₃SnO₂CC₆H₂Me₃（2）（Cy为环己基）。通过IR、¹H和¹³C NMR、元素分析及X-射线单晶衍射表征结构。（1）和（2）均属单斜晶系,配合物（1）空间群P2₁,晶体学参数：a=0.82304（2）nm,b=1.11119（3）nm,c=1.28390（3）nm,β=101.090（2）°,Z=2,V=1.15227（5）nm³,D_c=1.381g·cm^-3,μ（Mo Kα）=1.127mm^-1,F（000）=496,R₁=0.0529,wR₂=0.1387。配合物（2）空间群P2₁/c,晶体学参数：a=0.99962（2）nm,b=1.41597（2）nm,c=1.97359（3）nm,β=94.0420（10）°,Z=4,V=2.78653（8）nm³,D_c=1.266g·cm^-3,μ（Mo Kα）=0.937mm^-1,F（000）=1112,R₁=0.0540,wR₂=0.1619。配合物（1）和（2）的中心锡原子均为畸变四面体构型。通过分子间氢键作用,配合物（1）形成二维网状结构。试验表明,配合物（1）和（2）具有良好的热稳定性,对人癌细胞Colo205、HepG2、MCF-7、Hela、NCI-H460增殖均有较强的抑制作用。     

4-(氮杂-15-冠-5)-1,8-萘酰亚胺荧光探针的合成及性能研究

N-丁基-4-溴-1,8-萘酰亚胺与二乙醇胺反应, 合成了N-丁基-4-二(2-羟乙基)氨-1,8-萘酰亚胺, 进一步与对甲基苯磺酸二缩三乙二醇双酯反应合成了N-丁基-4-(氮杂-15-冠-5)-1,8-萘酰亚胺. 用NMR, IR, MS等表征了产物结构. 该化合物在二氯甲烷溶液中识别Li^＋和Na^＋, 识别后吸收光谱和荧光光谱蓝移.     

(μ-FcC≡CH)Co2(CO)6簇合物羰基取代衍生物的合成和分子结构

The substituted reactions of (μ-FcC≡CH)Co₂(CO)₆ with PPh₃, AsPh₃ and dppm have been studied and three new substituted derivatives have been obtained. The compounds were characterized by elemental analysis, IR, ¹H NMR, MS and X-ray crystallography. They have the following formula: (μ-FcC≡CH)Co₂(CO)_6-nL[n=1, L=PPh₃（2）, AsPh₃（3）; n=2, L=dppm (4)]. The cluster 2 crystallizes in monoclinic, space group P2₁/n, with a=1.342 4(8) nm, b=1.305 4(8) nm, c=1.875 0(9) nm, β=103.084(9)°, V=3.201(3) nm³, Z=4, F(000)=1 480, D_c=1.515 g·cm^-3, μ=15.62 cm^-1; final R indices [I > 2σ(I)]: R₁=0.040 9, ωR₂=0.076 9; S=1.007, Δρ_max=463e·nm^-3, Δρ_min=-395 e·nm^-3. The cluster 3 crystallizes in monoclinic, space group P2₁/n, with a=1.341 0(4) nm, b=1.307 9(4) nm, c=1.912 0(5) nm, β=103.043(5)°, V=3.267(15) nm³, Z=4, F(000)=1 552, D_c=1.574 g·cm^-3, μ=24.87 cm^-1; final R indices[I> 2σ（I）]：R₁=0.0437, ωR₂=0.078 2; S=0.995, Δρ_max=530 e·nm^-3, Δρ_min=-444 e·nm^-3. CCDC: 221860, 2; 221863, 3.     

三个二羧酸配体配位聚合物的合成、结构表征和荧光性质

以羧酸配体2,2''-（1,4-亚苯基双（亚甲基））双（硫二基）二苯甲酸（H₂L¹）和2,2''-（2,3,5,6-四甲基-1,4-亚苯基）双（亚甲基）双（硫二基）二苯甲酸（H₂L²）分别与金属盐反应,通过溶剂热方法合成了3个配位聚合物：{[Ni（L¹）（H₂O）₄]·2H₂O}_n （1）、[Zn（L¹）（DMA）₂]_n （2）和[Co（L²）（DMF）₂]_n （3）,其中DMA=N,N-二甲基乙酰胺,DMF=N,N-二甲基甲酰胺。对配合物1~3进行了单晶X射线衍射、元素分析、红外光谱、热重分析、粉末X射线衍射和固体紫外可见光谱测试和表征。单晶X射线衍射表明：3个配合物均为一维锯齿形链状结构,并通过氢键作用形成三维骨架,且配体均表现为反式构象。此外,对配合物2固态荧光性质进行了研究。     

蒽醌基金属-有机笼光氧化性能

将光活性蒽醌配体L¹和L²（L¹=N²,N⁷-双（（2,2''-联吡啶）-5-基）-9,10-蒽醌-2,7-双酰胺,L²=N²,N⁷-双（4-（（2,2''-联吡啶）-5-基）苯基）-9,10-蒽醌-2,7-双酰胺）与锌离子和亚铁离子通过配位自组装构筑得到一系列配合物1-Zn、2-Zn和2-Fe,单晶X射线衍射和电喷雾质谱等表征表明这一系列配合物为“2+3”的M₂L₃型金属-有机超分子结构。将蒽醌基金属-有机笼1-Zn与2-Zn应用于甲苯光催化氧化反应中,结果表明笼状催化剂和底物分子间形成超分子主客体化合物是其能有效氧化甲苯的关键。通过对芳香醇的光氧化反应进一步探究1-Zn与2-Zn的光氧化性能,实验结果表明催化产率受到取代基的电子效应和底物分子的尺寸的影响。     

茂基稀土邻氨基苯甲酰胺基双负离子配合物的合成及其环胺羰化反应和脒基化反应

Cp₃Ln与邻氨基苯甲酰胺在甲苯中反应,之后在HMPA和甲苯中结晶,以中等到高收率得到四核稀土有机配合物[CpLn（μ-η²：η²-NHC₆H₄CONH）（μ₃-η¹：η¹：η²-NHC₆H₄CONH）LnCp（HMPA）}₂（Ln=Yb,1a;Er,1b;Y,1c）。化合物1与4倍物质的量的PhNCO在甲苯中反应形成1,3-喹唑啉二氧基（Quo）双负离子稀土配合物[Cp₂Ln（μ₃-η²：η²：η¹-Quo）]₃Ln（HMPA）₂（Ln=Yb,2a;Er,2b;Y,2c）,表明化合物1中的Ln-NHAr键和ArCONH-Ln键能与异氰酸酯分子发生连续加成/胺消除反应,形成1,3-喹唑啉二氧基骨架。但化合物1a~1c与ⁱPrN=C=NⁱPr反应,仅得到ArNH基单加成产物{Cp₂Ln[μ-η³：η¹-ⁱPrNC（NHⁱPr）NC₆H₄CONH]}₃Ln（HMPA）₃ （Ln=Yb,3a;Er,3b;Y,3c）。而Cp3Ln与邻氨基苯甲酰胺和ⁱPrN=C=NⁱPr在甲苯中进行"一锅"反应,则形成双核配合物{CpLn[μ-η³：η²-NHCOC₆H₄NC（NHⁱPr）NⁱPr]}₂（Ln=Yb,4a;Er,4b;Y,4c）。值得注意的是,HMPA能够诱导配合物4发生配体重排反应,转化成化合物3。     

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%.     

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.     

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.     

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.     

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.     

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.     

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.