二烃基锡萘氧乙酸酯的合成、表征和{[(n-C4H9)2Sn(OOCCH2OC10H7)]2O}2的晶体结构

利用二烃基氧化锡和α-萘氧乙酸按1∶1反应，合成了8种新的有机锡化合物,{[(n-C₄H₉)₂Sn(OOCCH₂OC₁₀H₇)]₂O}₂(R= ⁿBu 1，2-ClC₆H₄CH₂ 2，3-ClC₆H₄CH₂ 3，4-ClC₆H₄CH₂ 4，2-FC₆H₄CH₂ 5，3-FC₆H₄CH₂ 6, 4-FC₆H₄CH₂ 7, 4-NCC₆H₄CH₂ 8)。用元素分析、IR、 ¹H NMR对其结构进行了表征,并测定了化合物{[(n-C₄H₉)₂Sn(OOCCH₂OC₁₀H₇)]₂O}₂ (1)的晶体结构。该化合物晶体属三斜晶系,空间群P1,a=11.974(7) nm，b=1.360 5(9) nm，c=1.386 5(9) nm，α=103.940(9)°，β=104.876(8)°，γ=99.807(9)°，Z=1，V=2.053(2) nm³，D_c=1.431 Mg·m^-3，μ=1.261 mm^-1，F(000)=900，S=1.004，R₁=0.061 0，wR₂=0.151 9。结果表明，化合物1是以Sn₂O₂为中心的中心对称二聚体结构，内环锡和外环锡原子均为五配位的畸变三角双锥构型。     

有机锡联苯乙酸酯的合成、结构表征和体外抗癌活性

合成了4个新的有机锡联苯乙酸酯{[(n-C₄H₉)₄Sn(O₂CCH₂C₆H₄C₆H₅-4)]₂O}₂ (1)和R₃SnO₂CCH₂C₆H₄C₆H₅-4(R=C₄H₅，2；c-C₆H₁₁，3；C₆H₅C(CH₃)₂CH₂，4)，利用元素分析、IR、 ¹H和 ¹³C NMR表征了其结构。通过X-射线单晶衍射测定了1和4的晶体结构。化合物1和化合物4均属三斜晶系，空间群P1。化合物1为具有Sn₂O₂四元环的中心对称二聚体结构，4为畸变的四面体结构。生物活性测试结果表明，化合物1和4对3种人癌细胞HeLa、CoLo205和MCF-7具有较好的体外抑制活性。     

3-(水杨酰肼)-丁基-2-酮肟和两个镍的酮肟配合物的合成和晶体结构

合成了3-(水杨酰肼)-丁基-2-酮肟H₂L(1，C₁₁H₁₃N₃O₃)和2个镍的3-(水杨酰肼)-丁基-2-酮肟化合物[Ni(HL)(CH₃COO^-)(C₅H₅N)₂](2)和[Ni(HL)₂]·2C₃H₇NO（3）。化合物1晶体属单斜晶系，空间群为P2₁/n，晶体学参数为：a=0.451 87(2) nm，b=2.086 8(1) nm，c=1.224 48(9) nm，β=94.974(3)°，V=1.150 3(1) nm³，Z=4，D_c=1.358 g·cm^-3，μ=0.101 mm^-1，F(000)=496，R=0.0435，wR=0.142 5。化合物2晶体属单斜晶系，空间群为P2₁/n，晶体学参数为：a=1.362 39(8) nm，b=1.345 37(6) nm，c=1.438 54(7) nm，β=113.138(3)°，V=2.424 6(2) nm³，Z=4，D_c=1.398 g·cm^-3，μ=0.843mm^-1，F(000)=1 064，R=0.042 4，wR=0.116 6。化合物3晶体属单斜晶系，空间群为P2₁/c，晶体学参数为：a=1.104 22(7) nm，b=2.860 1(1) nm，c=1.114 13(7)nm，β=114.589(5)°，V=3.199 5(3) nm³，Z=4，D_c=1.398 g·cm^-3，μ=0.667 mm^-1，F(000)=1 416，R=0.057 6，wR=0.1535。在化合物1晶体中，酮肟分子之间通过分子间氢键形成二维网状结构。在化合物2中，每个镍(Ⅱ)离子由1个3-(水杨酰肼)-丁基-2-酮肟的2个氮原子和1个氧原子，2个吡啶分子中的2个氮原子和1个乙酸根中的1个氧原子形成畸变的NiN₄O₂八面体配位构型，存在分子内氢键O-H(肟)…O(乙酸根)和O-H(酚)…N(酰肼)。在化合物3晶体中，每个镍(Ⅱ)离子由2个3-(水杨酰肼)-丁基-2-酮肟的4个氮原子和2个氧原子配位，形成畸变的NiN₄O₂八面体配位构型。晶体中存在O-H…O和O-H…N两种分子内氢键和O-H…O分子间氢键。     

二个含N-取代水杨基Schiff碱配体的镍配合物的合成和晶体结构

合成了二个N-取代水杨基Schiff碱的Ni(Ⅱ)配合物[Ni₂(dsh)(C₅H₅N)₆]·2C₅H₅N (H₄dsh=1，2-disalicyloylhydrazine) (1)和Ni(spmbh)(C₅H₅N) (H₂spmbh=N-salicylaldehyde-N-(4-methoxybenzoyl) hydrazone) (2)。化合物1：单斜晶系，P2₁/c空间群，a=1.274 74(5) nm，b=1.646 31(7) nm，c=1.199 59(5) nm，β=103.344(1)°，V=2.449 5(2) nm³，Z=2，D_c=1.381 g·cm^-3，M_r=1 018.44，μ=0.826 mm^-1，F(000)=1 060，R=0.033 1，wR=0.073 3；化合物2：单斜晶系，P2₁/c空间群，a=1.096 74(8) nm，b=0.946 44(6) nm，c=1.725 7(1) nm，β=91.006(4)°，V=1.791 0(2) nm³，Z=4，D_c=1.506 g·cm^-3，M_r=406.08，μ=1.109 mm^-1，F(000)=840，R=0.031 7，wR=0.049 0。具有晶体学中心对称性的双核镍化合物1中，1，2-二水杨酰基肼通过肼基N-N单键桥联二个Ni(Ⅱ)原子，Ni…Ni原子间距为0.468 83(4) nm，每个Ni(Ⅱ)原子具有轴向伸长的八面体配位构型。化合物2中，Ni(Ⅱ)原子具有平面正方形的配位构型。     

烃基取代茚基钌羰基化合物的合成及晶体结构

配体C₉H₇R(R=CH₂CH₂CH₃ (1),CH₂(CH₃)₂ (2),C₅H₉ (3),CH₂C₆H₅ (4),CH₂CH=CH₂ (5))分别与Ru₃(CO)12在二甲苯或庚烷中加热回流,得到了6个双核配合物[(η⁵-C₉H₆R)Ru(CO)(μ-CO)]₂(R=CH₂CH₂CH₃ (6),CH₂(CH₃)₂ (7),C₅H₈ (8),CH₂C₆H₅ (9),CH₂CH=CH₂ (10))和[(η⁵-C₉H₆)(H₃CH₂C)CHCH(CH₂CH₃)(η⁵-C₉H₆)] [Ru(CO)(μ-CO)]₂ (11).通过元素分析、红外光谱、核磁共振氢谱对配合物的结构进行了表征,并用X-射线单晶衍射法测定了配合物6,9,10和11的结构.     

3-(2,4-二羧基苯基)-2,6-二羧基吡啶原位脱羧构筑两个配位聚合物的结构及磁性

通过水热法合成了2个配位聚合物:[Cu(H₂dpcp)₂]_n (1)和[Mn₂(Hdpcp)₂(H₂O)₂·2H₂O]_n (2)[H₃dpcp=5-(2,4-二羧基苯基)-2-羧基吡啶],H₃dpcp由3-(2,4-二羧基苯基)-2,6-二羧基吡啶(H₄dpdp)原位脱羧生成.X-射线单晶衍射测得2个化合物都属于单斜晶系,化合物1结晶在P2₁/c空间群,a=0.639(13) nm,b=1.835(4) nm,c=1.115(2) nm,β=102.29(3)°,Z=2;化合物2结晶在C2/c空间群,a=3.126(6) nm,b=1.004(2) nm,c=1.080(2) nm,β=93.73(3)°,Z=4.化合物1以配体H₂dpcp-桥连Cu(Ⅱ)形成一维链状结构.化合物2通过Hdpcp²-桥连Mn(Ⅱ)形成二维层状结构,并进一步通过氢键作用形成三维超分子结构.负的Weiss常数θ表明化合物2存在反铁磁耦合作用.     

一维交替链状稀土配位聚合物[Er(dpa)(pya)(H2O)]n和[Nd2(pya)6(H2O)4]n的水热合成及结构表征

在水热条件下，稀土氧化物与2，2′-联苯二甲酸及异烟酸反应得到了两个新颖的一维交替链状配位聚合物[Er(dpa)(pya)(H₂O)]_n和[Nd₂(pya)₆(H₂O)₄]_n(H₂dpa=2，2′-联苯二甲酸；Hpya=异烟酸)。测定了它们的晶体结构，并进行了红外光谱和元素分析等 性质的表征。晶体结构测定表明这两个化合物同属单斜晶系，并具有相同的空间群P2₁/n， 晶体学参数分别为配合物1：a= 0.8830(3) nm，b=1.058 5(3) nm，c=2.089 1(6) nm，β=98.429(4)°，D_c=1.883g·cm^-3， V=1.931 4(10) nm³，Z=4； 配合物2：a=0.968 9(4) nm，b=1.978 3(9) nm，c=1.164 2(6) nm，β=112.106(7)°，D_c=1.756 g·cm^-3，V=2.067 5(17) nm³，Z=4。     

过渡金属配合物为模板合成两个新的硫代锡酸盐(英)

利用溶剂热方法在温和的条件下合成了二个新的硫代锡酸盐[Mn(en)₃]₂Sn₂S₆·2H₂O(en=H₂NC₂H₄NH₂) (1)和[Mn(dien)₂]₂Sn₂S₆ (dien=H₂NC₂H₄NHC₂H₄NH₂) (2)，通过X-射线衍射分析表征其晶体结构。化合物1的晶体学参数：C₁₂H₄₈Mn₂N₁₂S₆Sn₂·2H₂O，M_r=936.28，单斜晶系，P2₁/c，a=1.012 9(3)，b=1.574 6(4)，c=1.152 4(3) nm，β=102.36(1)°，V=1.795 5(8) nm³，Z=2，D_c=1.732 g·cm^-3，μ(MoKα)=2.442 mm^-1，F(000)=940，R=0.063 3，wR=0.081 4；化合物2的晶体学参数：C₁₆H₅₂Mn₂N₁₂S₆Sn₂，M_r=952.32，单斜晶系，P2₁/c，a=1.248 12(3)，b=0.937 60(4), c=1.776 17 (7) nm，β=121.752(2)°，V=1.767 5(1) nm³，Z=2，D_c=1.789 g·cm^-3，μ(MoKα)=2.479 mm^-1，F(000)=956，R=0.057 9，wR=0.137 4。在两个化合物中存在的[Sn₂S₆]^4-阴离子均由共边的两个SnS₄四面体构成。在1中，锰离子螯合3个乙二胺做为阳离子模板，而在2中锰离子螯合2个二乙烯三胺做为阳离子模板。金属配合物作为模板对阴离子[Sn₂S₆]^4-在晶体结构中的排列产生重要的影响。     

镍螺旋化合物及其杂银配位聚合物的设计合成与结构

采用两个易扭转异构的双三齿有机配体，双吡啶二甲基-6,6′-二酰肼-2,2′-连吡啶(H₂L¹)和双吡啶二乙基-6,6′-二酰肼-2,2′-连吡啶(H₂L²)，和金属镍离子组装得到2个金属螺旋体(helicate)，Ni₂(HL¹)₂(PF₆)(BF₄)(CH₃OH)(H₂O)₂ (1)和Ni₂(HL²)(H₂L²)(ClO₄)₃(C₂H₅OH)(CH₃OH)H₂O)₃ (2),并测定了它们的晶体结构。同时由配体H₂L³出发,通过逐级组装的方法,得到一个镍-银杂金属的配位聚合物Ni₂Ag₂(HL³)₂(ClO₄)₂(CH₃CN)₃ (3)。单晶结构表明，配位聚合物3中配体H₂L³首先与镍离子组装成分子盒化合物(molecular box)，该结构单元进一步通过Ag离子与分子盒外围N原子配位，使分子盒互相串连成一维配位聚合物3，分子盒聚集体沿c方向伸展成一维链结构，链与链之间相互平行，进一步堆积成二维孔道结构。     

基于烟酰腙Schiff碱的Cu(Ⅱ)和Ni(Ⅱ)配合物的合成、晶体结构和性质

采用缓慢挥发法合成了2个烟酰腙类Schiff碱配合物[Cu(Py)(HL¹)]₂ (1)和[Ni(L²)₂] (2), 其中, H₃L¹=2, 4-二羟基苯甲醛缩烟酰腙, HL₂=2-乙酰基吡啶缩烟酰腙。采用元素分析、红外光谱、紫外光谱、荧光光谱和热重分析以及X-射线单晶衍射分析进行了表征。结果表明, 1和2的晶体均属单斜晶系, P2₁/c空间群;1的晶胞参数a=0.739 86(12) nm, b=1.903 7(3) nm, c=1.154 86(19) nm, β=105.090(3)°, V=1.570 5(4) nm³;该化合物是中心对称的双核配合物, 每个Cu(Ⅱ)离子都处于畸变四方锥配位环境;结构基 元通过π-π相互作用和O-H…N氢键形成三维超分子。2的晶胞参数a=2.034 0(5) nm, b=1.183 2(3) nm, c=1.020 7(3) nm, V=2.456 1(11) nm³;中心离子Ni(Ⅱ)的配位数为6, 它处于畸变八面体配位环境。配合物有很高的热稳定性, 分解温度分别为315 ℃ (1)和358 ℃ (2)。     

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.     

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.     

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.     

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.     

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.     

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.