PMBP缩4-甲基水杨酰肼铜、锌配合物:合成、结构及锌配合物的荧光性质

合成并通过单晶衍射、元素分析、红外光谱表征了配合物[(Cu)(L)(Cl)]·0.5EtOH·1.5H₂O (1)和{[Zn(L)(NO₃)]·2CH₃CN}_n (2)的结构(HL为PMBP缩4-甲基水杨酰肼; PMBP=1-phenyl-3-methyl-4-benzoyl-5-pyrazolone)。单晶衍射结果表明,配合物1中,Cu(Ⅱ)离子与来自烯醇化脱质子配体L^-的2个O原子和1个N原子,及1个氯离子配位,采取扭曲的平面正方形配位构型。而配合物2中,Zn(Ⅱ)离子采取扭曲的三角双锥配位构型,与来自L^-的NO₂电子供体,1个单齿配位的硝酸根和相邻配体吡唑啉酮N原子配位,形成沿b轴方向的一维链状结构。在310 nm紫外光激发下,配合物2在434和459 nm处有很强的荧光发射,而配体的荧光发射峰在521 nm,强度明显弱于配合物。此外,固态配体和配合物2的荧光寿命分别为7.352 8和7.755 6 μs。     

含吡咯环的缩氨基硫脲席夫碱镍、铜配合物的晶体结构及与DNA的相互作用

合成并通过单晶衍射、元素分析及红外光谱表征了配合物[Ni（L¹）₂]·2DMF （1）,[Cu（L¹）₂]·THF·0.25MeOH·2.25H₂O（2）, [Ni（L²）₂]·2MeOH（3）和[Cu（L²）₂]·2EtOH （4）的结构（HL¹：5-甲酰基-3,4-二甲基-吡咯-2-甲酸乙酯缩硫代氨基脲,HL²：5-甲酰基-2,4-二甲基-吡咯-3-甲酸乙酯缩4-异丙基氨基硫脲）。单晶衍射结果表明,除溶剂分子不同外,配合物1~4的结构相似。每个配合物的中心金属离子分别与来自2个阴离子L^-配体的N₂S₂电子供体配位,采取扭曲的平面正方形配位构型。荧光光谱结果表明,配合物与DNA的相互作用强于其配体。     

酰胺型配体铜、锌、银配合物的合成、结构及荧光性质

合成并通过单晶衍射表征了5个配合物[CuLCl₂]·CH₃COCH₃ (1)、[ZnLCl₂]·CH₃COCH₃ (2)、[ZnL(NO₃)₂]·0.5CH₃COCH₃ (3)、[AgL₂]ClO₄ (4)和[AgL₂]BF₄ (5)(L=2-(5-氯-8-喹啉氧基)-1-(吡咯烷-1-基)乙酮)。配合物1和2同构,五配位的中心金属离子采取扭曲的四方锥配位构型,与来自配体L的2个氧原子和1个氮原子及2个氯离子配位。而在配合物3中,锌离子与1个三齿配位的配体L,1个单齿配位的硝酸根和1个双齿配位的硝酸根配位,配位构型为扭曲的八面体。配合物4和5中,中心金属与配体的比例为1:2。银离子与2个三齿配位的配体L配位,采取扭曲的八面体配位构型。乙腈溶液中,配合物1、2、4和5在410 nm处的最大荧光发射峰与配体L相似。而配合物3由于配体到锌离子之间的能量转移,最大荧光发射峰红移至430 nm。     

吡咯甲亚胺镍/铜/锌配合物的合成、荧光性质及镍、铜配合物的晶体结构

合成并表征了3个配合物NiL(1),Cu_2L_2(2)和Zn_2L_2(3)(H_2L=1,2-双(3,5-二甲基-4-乙氧羰基-吡咯-2-基)苯)。单晶衍射结果表明在配合物1中,脱质子配体用4个氮原子与金属Ni(Ⅱ)配位,中心金属离子为扭曲的平面正方形配位构型。而双核配合物2拥有双螺旋结构,每个配体桥联2个具有平面正方形配位构型的铜中心。推测配合物3和2的结构类似。此外还研究了配体和配合物的荧光性质。     

PMBP缩4-甲基水杨酰肼铜、锌配合物: 合成、结构及锌配合物的荧光性质

合成并通过单晶衍射、元素分析、红外光谱表征了配合物[(Cu)(L)(Cl)]·0.5EtOH·1.5H₂O (1)和{[Zn(L)(NO₃)]·2CH₃CN}_n (2)的结构(HL为PMBP缩4-甲基水杨酰肼; PMBP=1-phenyl-3-methyl-4-benzoyl-5-pyrazolone)。单晶衍射结果表明, 配合物1中, Cu(Ⅱ)离子与来自烯醇化脱质子配体L^-的2个O原子和1个N原子,及1个氯离子配位, 采取扭曲的平面正方形配位构型。而配合物2中, Zn(Ⅱ)离子采取扭曲的三角双锥配位构型, 与来自L-的NO₂电子供体, 1个单齿配位的硝酸根和相邻配体吡唑啉酮N原子配位, 形成沿b轴方向的一维链状结构。在310 nm紫外光激发下, 配合物2在434和459 nm处有很强的荧光发射, 而配体的荧光发射峰在521 nm, 强度明显弱于配合物。此外, 固态配体和配合物2的荧光寿命分别为7.352 8和7.755 6 μs。     

两个吡咯酰腙铜配合物的制备、结构及抗肿瘤活性

合成并通过X-射线单晶衍射表征了2个铜配合物[Cu(H₂L)₂(THF)] (1)和[Cu₂(L)Cl(CH₃OH)]·H₂O (2) (H₃L=3,4-二甲基吡咯-5-甲酰基-2-甲酸乙酯-2-羟基-4-甲基苯甲酰腙)。结果表明在配合物1中, 中心金属离子与周围2个提供N₂O配位原子的酰腙阴离子和1个四氢呋喃分子配位, 具有扭曲的四方锥配位构型。然而, 在双核配合物2中, 酰腙配体脱去3个质子, 通过NO和N₂O₂配位原子分别桥联2个具有平面正方形配位构型的铜中心。2个配合物对人肺癌细胞A549, 人食管癌细胞ECA109和人胃癌细胞SGC7901展现出显著的抗肿瘤活性。     

含吡咯环的缩氨基硫脲席夫碱镍、铜配合物的晶体结构及与DNA的相互作用

合成并通过单晶衍射、元素分析及红外光谱表征了配合物[Ni（L¹）₂]·2DMF（1）,[Cu（L¹）₂]·THF·0.25MeOH·2.25H₂O（2）,[Ni（L²）₂]·2MeOH（3）和[Cu（L²）₂]·2EtOH（4）的结构（HL¹：5-甲酰基-3,4-二甲基-吡咯-2-甲酸乙酯缩硫代氨基脲,HL²：5-甲酰基-2,4-二甲基-吡咯-3-甲酸乙酯缩4-异丙基氨基硫脲）。单晶衍射结果表明,除溶剂分子不同外,配合物1~4的结构相似。每个配合物的中心金属离子分别与来自2个阴离子L-配体的N₂S₂电子供体配位,采取扭曲的平面正方形配位构型。荧光光谱结果表明,配合物与DNA的相互作用强于其配体。     

酰胺型配体铜、锌、银配合物的合成、结构及荧光性质

合成并通过单晶衍射表征了5个配合物[CuLCl₂]·CH₃COCH₃（1）、[ZnLCl₂]·CH₃COCH₃（2）、[ZnL（NO₃）₂]·0.5CH₃COCH₃（3）、[AgL₂]ClO₄（4）和[AgL₂]BF₄（5）（L=2-（5-氯-8-喹啉氧基）-1-（吡咯烷-1-基）乙酮）。配合物1和2同构,五配位的中心金属离子采取扭曲的四方锥配位构型,与来自配体L的2个氧原子和1个氮原子及2个氯离子配位。而在配合物3中,锌离子与1个三齿配位的配体L,1个单齿配位的硝酸根和1个双齿配位的硝酸根配位,配位构型为扭曲的八面体。配合物4和5中,中心金属与配体的比例为1∶2。银离子与2个三齿配位的配体L配位,采取扭曲的八面体配位构型。乙腈溶液中,配合物1、2、4和5在410 nm处的最大荧光发射峰与配体L相似。而配合物3由于配体到锌离子之间的能量转移,最大荧光发射峰红移至430 nm。     

三个包含酰胺型配体铜/锌配合物的合成、结构及荧光性质

合成并通过单晶衍射表征了3个配合物[CuLCl₂]·CH₃CN(1),[CuLBr₂]·CH₃CN(2)和[ZnL(NO₃)₂]·CH₃CN(3)(L=2-(5-氯-8-喹啉氧基)-1-(吡咯烷-1-基)乙酮)。在配合物1和2中,五配位的铜离子采取扭曲的四方锥配位构型,与来自配体L的2个氧原子和1个氮原子及2个卤离子配位。而在配合物3中,锌离子与1个三齿配位的配体L,1个单齿配位的硝酸根和1个双齿配位的硝酸根配位,配位构型为扭曲的八面体。乙腈溶液中,配合物1和2在410 nm处的最大荧光发射峰与配体L的相似,强度有所降低。而配合物3由于配体到锌离子之间的能量转移,最大荧光发射峰红移至430 nm。     

两个哒嗪衍生物为配体的铜(Ⅱ)配合物的合成、晶体结构和清除自由基活性

本文合成了2个新型Cu(Ⅱ)配合物：[Cu₂(L₁)₂Cl₄]L₁ (1)和[Cu(L₂)₂(NO₃)₂(H₂O)] (2),其中L₁为3,6-二(苯并三唑-1-)哒嗪,L₂为3-(1,2,4-三氮唑-1-)-6-氯哒嗪。配合物1的晶体属于三斜晶系,P1空间群。铜离子与3个氯原子和配体的2个氮原子形成五配位的四角锥构型,2个氯原子以μ-2方式桥联2个中心铜原子。在配合物1的晶胞中1个游离配体未参与配位。配合物2的晶体属于单斜晶系,C2/c空间群。铜原子处于五配位四角锥配位环境中。分子间氢键将2的分子结构延伸为一维链、二维网状结构,并通过分子间的π-π堆积作用进一步使配合物构型发展成三维拓扑结构。应用邻苯三酚自氧化法对本文所涉及的化合物进行了清除自由基活性测试,结果表明：这2个配体都具有较好的活性。     

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.     

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.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.     

Copper-catalyzed multicomponent reactions of 2-iodoanilines,benzylamines, and elemental sulfur toward 2-arylbenzothiazoles

A relatively cheap copper salt-catalyzed, three-component approach providing 2-arylbenzothiazoles in good to excellent yields from readily available 2-iodoanilines, benzylamines, and sulfur powder is reported. This methodology allows preparation of various classes of 2-arylbenzothiazoles and provides a general, reliable approach.