Syntheses and Crystal Structures of Methyl 2-（4,5-Dibromo- 1-methylpyrrole-2-carbonylamino）-3-phenyl propanoate and 4,5-Dibromo-1-methyl-2-trichloroacetylpyrrole

1 INTRODUCTION Pyrrole and its derivatives have attracted much attention due to their chemical properties as well as biological activities[1]. They have been widely used as the materials to produce pharmaceutical, essences, biochemicals, etc. It has been found that a great deal of pyrrole derivatives present bioactivities, such as antitumor and antiviral activities[2~5]. Thus, due to the interest in exploring the syntheses of potential bioactive materials which contain pyrrole ring andna…     

Synthesis and Crystal Structure of 2-(4’-Methylphenoxy)-5,8,9-trimethyl-3-phenyl Thieno[3′,2′:5,6]pyrido[4,3-d]pyrimidin-4-(3H)-one Hydrochloride

1 INTRODUCTION Pyrido[4,3-d]pyrimidine derivatives have pharma- ceutical activity and germicidal action[1~3]. So far, hundreds of tetrahydro- and octahydro-pyrido[4,3- d]pyrimidines have been synthesized as potential diuretic, antirheumatic and bacteriostatic drugs, but only a few of fully aromatic pyrido[4,3-d] pyrimi- dines are known. An important synthetic route to synthesize fully aromatic pyrido[4,3-d]pyrimidines is the condensation reaction of 4-aminonicotinic acid and amines[4]. Ho…     

Synthesis and Crystal Structure of Dibromo [1,1′- bis(diphenylphosphino)ferrocene]cadmium(II)

1 INTRODUCTION The transition metal complexes containing ferrocene ligand arouse the interest of chemists because of their novel structures and special properties[1]. The ferrocene derivatives have been used in electrochemistry, in nonlinear optics, and as molecular ferromagnets. Some complexes of 1,1′-bis(diphenylphosphino)ferrocene (dppf) have been synthesized, and many of their crystal structures have been reported by far[2~5]. Here we report the synthesis and crystal structure of a …     

Syntheses and Crystal Structures of Three Novel Amino-acid-containing Polyoxomolybdosilicates

1 INTRODUCTION Polyoxometalates as metal-oxygen cluster ions have received a great deal of research due to their potential applications in catalysis, medicine and ma- terials science[1]. The modification of organic groups to the surface of polyoxoanions gives POMs more interesting character, and many derivatives of poly- oxoanions with organic ligands have been studied[2]. Particularly the potential applications of polyoxo- metalate as drugs in anti-viral and anti-AIDS have attracted t…     

Synthesis and Crystal Structure of Tert-butyl 4-[(E)-4-(1,3-Dioxo-1,3-dihydro-2H-isoindol-2-yl)-1-butenyl] Benzoate

1 INTRODUCTION Phthalimide and its derivatives are synthetic mate- rials, which are widely used as important chemical intermediates of biosensors[1] and many drugs such as Citalopran[2], luminal[3], Beta-Lactam[4] and the No. three generation quinolones[5], and they have been identified as active groups of some drugs and chemical luminescence reagents[6, 7]. Tert-butyl 4- [(E)-4-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-1- butenyl] benzoate is an intermediate of a new type of insulin sen…     

Synthesis and Structure of O-Ethyl S-Hydrogen Isoquinolin-1-ylcarbonothioimidate

1 INTRODUCTION Isoquinoline and its derivatives have attracted much attention due to their physiological and phar- macological activities including antibacterial, antitu- mor, etc[1~3]. A lot of investigations in this field have been focused on the syntheses and applications in physiology and pharmacy of isoquinoline and its derivatives[4, 5]. Recently, a novel class of 1-subs- tituted isoquinolines or triazoloquinazolines deriva- tives have been identified as potential antagonists for the…     

Synthesis and Crystal Structure of Zn(II) Complex with Tridentate Ligand N-(2-Hydroxy-1-naphthylidene)-L-serine

1 INTRODUCTION As the basic building blocks of proteins or enzy- mes, amino acids are versatile ligands showing flexi- ble coordination modes[1]. Recently, researchers have synthesized some metal complexes with amino acids and their derivatives[2～6]. Considerable efforts have been devoted to the preparation and structure of amino acid Schiff base complexes with transition metals[6～11]. In such cases, some Zn(II) complexes have been reported. However, most of them have been carried out…     

Synthesis and Spectroscopic Characterization of Organophosphoryl Polyoxotungstates α-A-[RP(O)]_2PW_9O_(34)~(5-)

Derivatized polyoxometalates (POMs ), especially those including organic andorganometallic components, have received current attention due to their potential applicationin catalysis, medicine and material sciences~[1]. For these reasons, several research groupshave devoted their efforts to the synthesis of organic and organometallic derivatives of heteropolyanions~[2]. However, the studies on organophosphorus-substituted heteropolyanionshave been reported rarely. Recently, a unique study on …     

Novel large heteropolymetalate complexes formed from Ni(II) and cryptate [As_4W_(40)O_(140)]~(28-)——Synthesis and structure characterization

Heteropolyoxometalates have received much attention due to their fascinating variety of structures and chemical compositions, and potential applications in catalysis, materials science, environmental protection and medicine[1—5]. The synthesis design, structure properties of novel large polyoxometalates and derivatives of known polyoxometalates are interesting and remain a challenge. Several derivatives of big cyclic anion [(B--AsO3W9O30)4(WO2)4]28- 揂s4W40?have been reported[6—8], and th…     

Syntheses and Crystal Structures of Two Cyano-bridged Bimetallic Complexes [Ce(DMSO)_4(H_2O)_3Fe(CN)_6]·H_2O and [La(DMSO)_4(H_2O)_3Co(CN)_6]·H_2O(DMSO = Dimethylsulfoxide)

1INTRODUCTION Recently,cyano-bridged lanthanide-transition me-tal complexes have been extensively investigateddue to their potential applications as precursors in the preparation of rare earth orthoferrites,fluores-cent and magnetic materials[1].Various complexes of this system have been obtained in order to ex-plore the relations between structures and pro-perties by using different ligands,such as DMF,4,4?-bipy,and so on,to fill the coordination sites of lanthanide ions[2～9].But up to…     

Characterization and Crystal Structure of Bis(N'-ethyl-N-piperazinly-carbodithioato-S,S') Nickel(II) Complex:Ni(S_2CNC_4H_8NC_2H_5)_2

1 INTRODUCTION The ability of dialkyldithiocarbamate anion, -S2- CNR2 (dtc) ligand, to bind metal has been known for many years[1, 2]. It forms a chelate with virtually all transition elements and is proven to be a versatile chelating agent for the separation and extract of metals in analytical chemistry and mineral floa- ting[3～5]. Water soluble dialkyldithiocarbamate com- plexes have been tested in various medical appli- cations[6]. Some of substituted dithiocarbamate salts also show …     

Synthesis and Structural Characterization of Mononuclear Mn~(II) Picolilato Complex Mn(2-C_5H_4NCOO)_2(H_2O)_2.1/2CH_3CN

1 INTRODUCTION Manganese has been implicated as an essential part of the active center in various manganese enzymes. Various nuclearities have been observed from mononuclear atom in superoxide dismutase [1] to the tetranuclear atom of oxygen evolution in photosystem II[2]. The manganese active centers in biological systems are surrounded by O and N coordination sphere[3, 4]. Synthetic efforts have produced a great variety of Mn clusters with varying nuclearity and oxidation states. Si…     

Synthesis of cis-(±)-2-Hydroxymethyl-5-(Cytosine-1''''-yl)-1,3-Oxathiolane (BCH-189)

cis-BCH-189 are potent anti-HIV agents and have been synthesized from mannose1 galactose2 or glucose3 etc. Owing to so many synthetic steps, it is difficult and expensive to obtain a few grams. In this paper, we have designed new route and promoted the reaction conditions for the synthesis of this nucleoside cis- (+)- BCH-189 from cheap starting material via a four step route as shown in Scheme 1. By this method, a series of derivatives of title compound can be synthesized conviniently for…     

Synthesis and Crystal Structure of 1,7,7-Trimethyl- 4-（4-methoxyphenyl）-4,6,7,8-tetrahydroquinoline- 2,5（1H,3H）-diones under Microwave Irradiation

1 INTRODUCTION Various quinolone derivatives are known to dis- play interesting biological properties ranging from microbial activity to cytotoxicity[1]. They have been reported as antiviral (HIV-1)[2] and antitumor agents[3] as well as used as tubulin[4], topoisomerase[5] and thrombocyte inhibitors[6]. As a member of the quino- lone family, substituted N-phenyl-2-quinolones re-present the structural basis of many biologically active compounds, such as protein kinase inhibitors, immunodu…     

Synthesis and Structure of Bis[2,6-bis(2-pyridylamino)pyridinium] Tetrachlorocadmiumate(II)

1 INTRODUTION The d10 configuration of Cd(II) permits a wide variety of coordination numbers and geometries[1~3]. In recent years, one-, two- and three-dimensional infinite supramolecular coordination assemblies of Cd(II) have been the subject of great interest owing to their potential applications in catalysis, optical properties, clathration, etc[4~8]. In fabricating the coordination assemblies, organic ligands as well as inorganic anions have been observed to control the structural di…     

Synthesis and Crystal Structure of a Zinc(II) Complex Salt with the Schiff Base of Picolinaldehyde N-oxide and Semicarbazone

1 INTRODUCTION The donor properties of pyridine N-oxide and its substituted derivatives to form metal complexes have been widely investigated[1～3]. The resulting comple- xes were used as drugs[4] and catalysts[5]. So far, there have been a few reports on the synthesis of Schiff base derived from picolinaldehyde N-oxide with se- micarbazone (PNOS Scheme 1) and its metal com- plexes. And crystal structures of the complexes of PNOS with Au(III)[6], Pd(II)[7] and Cu(II)[8] were re- …     

Synthesis and Crystal Structure of a Dicopper(Ⅰ) Complex with Bis(diphenylphosphino)methane and Diethyldithiocarbamate

1 INTRODUCTION Dithiocarbamate derivatives and their metal complexes are extremely versatile compounds which have been used, for example, in the treatment of alcoholism, sarcoma cell and as possible pro- tection against the lethal effect of X-rays etc[1]. Owing to the striking structure features and diversified applications of the metal complexes with dithiocarbamate[2～6], it is of theoretical and practical significance to study the coordination chemistry much more adequately. The meta…     

Synthesis and Structure Characterization of Aqua-(μ_2-carbonato-O,O'''')-(2,2''''-bipyridyl)-copper(Ⅱ) Dihydrate

1 INTRODUCTION The class of materials of carbonato metal- organic compounds has received much attention as a consequence of their potential applications in biochemical and environmental protection[1～3]. Many carbonato compounds of Cu2+, Co3+ and Zn2+ etc. have been studied[4～6]. The carbonate anion is a versatile bridging ligand, which can bind metal cations in different modes to generate mononuclear, binuclear, trinuclear, tetranuclear and even 1D, 2D and 3D structures[4, 7, 8]. We…     

Synthesis and Crystal Structure of [Ni(bdpm)_2(OAc)]_2(N_3)_2·5H_2O(bdpm=Bis(3,5-dimethylpyrazol-1-yl)methane,OAc=CH_3COO~-)

1 INTRODUCTION Bis(pyrazol-1-yl)methane has been one of the po- pular polydentate nitrogen donor ligands due to its strong chelating coordination to transition metal ions as capping ligand. Coordination behavior of the li- gand is able to yield stable M-N-N-C-N-N six-mem- bered boat conformation[1, 2]. The complexes con- taining bdpm ligand have been widely synthesized and characterized in recent years, and exhibit the striking properties in catalysis, magnetism and so on[3-10]. For exa…     

Synthesis and Crystal Structure of 3-（Trichloroacetyl） Indole

1 INTRODUCTION Indole and its derivatives have attracted much at-tention due to their chemical properties as well asbiological activities[1, . They have been widely used 2]as the materials for producing pigment, perfume,plant growth regulators, etc. Recently, it has alsobeen found that some indole derivatives present anti-tumor and antiviral activities[3～5]. During our sear-ches for bioactive compounds, a series of indole deri-vatives were synthesized, among …