5-(2-芳氧甲基苯并咪唑-1一亚甲基)-1,3,4-噁二唑-2-硫酮的合成、晶体结构及生物活性研究

以2-芳氧甲基苯并咪唑-1-乙酰肼类化合物为原料在微波辐射条件下合成了10种尚未见文献报道的5-(2-芳氧甲基苯并咪唑-1-亚甲基)-1,3,4-噁二唑-2-硫酮衍生物,化合物结构经IR 1H NMR,13C NMR和元素分析进行了表征,6a晶体结构表明,该化合物通过分子间氢键自组装成了沿b轴无限延伸的一维链状超分子结构,属于单斜晶系,P21/c空间群,a=11.5484(13)A,6=16.5319(19)A,c=11.3595(14)A,β=108.755(2)°,Z=2,V=2053.6(4)A3,Dx=1.328 g/cm3,F(000)=860,μ=0.19 mm-1,R=0.060,wR=0.196.初步生物活性试验结果表明该系列部分化合物对油菜幼苗的生长具有明显的生长调节作用,并对枯草杆菌具有一定的抑制作用.     

4-芳亚甲基-2-苯基噁唑-5-酮的超声辐射合成

噁唑酮;4-芳亚甲基-2-苯基噁唑-5-酮的超声辐射合成     

5-芳氧甲基-2-噁唑烷酮的合成及表征

环氧氯丙烷;氯甲基噁唑烷酮;合成;芳氧甲基噁唑烷酮     

[5-(芳亚甲基氨基)-1,3,4-噻二唑-2-基]硫乙酰芳胺的合成及 生物活性研究

在K2CO3存在下利用聚乙二醇-400 (PEG-400)作相转移催化剂, 于固-液相转移催化条件下, 通过5-芳亚甲基氨 基-2-巯基-1,3,4-噻二唑与氯乙酰芳胺的硫烷基化反应, 合成了16个未见文献报道的[5-(芳亚甲基氨基)-1,3,4-噻二唑-2-基]硫乙酰芳胺衍生物. 经元素分析, FT-IR,1H NMR和13C NMR确证了其结构. 生物活性实验结果表明, 部分化合物对小麦幼苗的生长具有明显的植物生长调节活性, 并对枯草杆菌具有一定的抑制活性.     

2-(1H-苯并咪唑-2-基)-5-取代-1,3,4-噁二唑化合物的合成及抑菌活性

以苯并咪唑-2-甲酸、水合肼、取代苯基异硫氰酸酯和取代苯甲酸等为原料,经多步反应合成了16种2-(苯并咪唑-2-基)-5-取代苯基-1,3,4-噁二唑和2-(苯并咪唑-2-基)-5-取代苯胺基-1,3,4-噁二唑新化合物,并考察了微波辐射对反应的影响.产物结构利用IR,1H NMR,13C NMR和元素分析确证.用生长速率法测试了目标化合物对番茄灰霉病菌和小麦菌核病菌的离体抑制活性,结果表明3种化合物对番茄灰霉病菌有很高的抑制活性,其EC50分别为2.55,6.34和5.12μg/mL,活性高于对照药剂多菌灵(EC50=7.40μg/mL).     

3-（3-乙酰基-5-芳氧亚甲基-2,3-二氢-1,3,4-噁二唑-2-基）色酮类化合物的合成

3-（3-乙酰基-5-芳氧亚甲基-2;3-二氢-1;3;4-噁二唑-2-基）色酮类化合物的合成;噁二唑啉;色酮;合成     

2-(5-取代苯氧甲基-1,3,4-噻二唑-2-亚胺基)-5-(取代苯基亚甲基)-4- 噻唑啉酮的合成

以2-氨基-5-取代苯氧甲基-1,3,4-噻二唑(1)为起始原料, 合成了中间体2-氯乙酰氨基-5-取代苯氧甲基-1,3,4-噻二唑)-2-乙酰亚胺(2)和2-(5-取代苯氧甲基-1,3,4-噻二唑-2-亚胺基)-4-噻唑啉酮(3), 化合物3进一步与取代苯甲醛发生类Knoevenagle缩合反应, 得到了一系列2-(5-取代苯氧甲基-1,3,4-噻二唑-2-亚胺基)-5-(取代苯基亚甲基)-4-噻唑啉酮类化合物4a～4p. 目标化合物4a～4p的结构经IR, ¹H NMR和元素分析确证.     

微波促进下2-芳氧甲基苯并咪唑-1-乙酸衍生物的合成及生物活性研究

采用微波辐射和相转移催化技术, 在K₂CO₃存在下利用PEG-400作相转移催化剂, 经过N-烷化、水解和酸化等步骤合成了10种尚未见文献报道的2-芳氧甲基苯并咪唑-1-乙酸衍生物. 经元素分析, FT-IR, ¹H NMR和¹³C NMR确证了其结构. 生物活性实验结果表明该系列化合物对小麦幼苗根系和芽的生长均有明显的调节活性.     

微波诱导下2-芳氧甲基苯并咪唑-1-水杨醛乙酰腙衍生物合成及生物活性研究

在微波辐射条件下, 通过2-芳氧甲基苯并咪唑-1-乙酰肼衍生物与水杨醛进行缩合反应, 合成了10种未见文献报道的2-芳氧甲基苯并咪唑-1-水杨醛乙酰腙衍生物. 它们的结构经元素分析, IR, ¹H NMR和¹³C NMR确证. 初步生物活性试验结果表明该系列化合物对小麦幼苗的生长具有明显的调节作用.     

2-芳基-5-(5-苯基-2H-四唑-2-亚甲基)-1,3,4-噁二唑类化合物的研究

作者曾研究2-芳基-5-(2-苯基-4-喹啉基)-1,3,4-噁二唑类衍生物,并发现它们具有促进小麦发芽生长的功效。Juby和Shan等报道某些四唑类化合物具有消炎性     

Synthesis and characterization of two new coordination supramolecular structures from a versatile unsymmetric 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione (Hpot) ligand

Two new inorganic–organic coordination networks based on a versatile and unsymmetric building block 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione (Hpot) and inorganic Co^II and Cd^II salts have been synthesized in mixed solvent media and structurally characterized by single-crystal X-ray diffraction analysis. Crystal Hpot (1) was obtained from methanol solution. Reaction of Co(NO₃)₂ · 6H₂O with Hpot afforded a neutral two-dimensional (2-D) porous coordination polymer {[Co(pot)₂] · 6H₂O}_n (2) with a (4,4) network, which shows a 3-D supramolecular network through O–H?O weak interactions. While substituting the transition metal ions used in 2 with Cd(NO₃)₂ · 6H₂O, a neutral 2-D coordination polymer [Cd₂(pot)₄]_n (3) with a (6,3) network which further extended to a 3-D supramolecular structure through versatile hydrogen bonds C–H?X (X = O, N and S) was obtained. It is remarkable that the building block “pot” anion exhibits versatile coordination modes in complexes 2 and 3. These results indicate that the versatile nature of this rigid unsymmetric ligand, together with the coordination preferences of the metal centers, plays a critical role in construction of novel coordination polymers. The properties of gas absorption, magnetism and luminescence of 2 and 3 have been investigated and discussed in detail.     

Radius-dependent assembly of complexes with the rigid unsymmetric ligand 5-(2-pyridyl)-1,3,4-oxadiazole-2-thione: Syntheses,structures and luminescence properties

The free ligand, 5-(2-pyridyl)-1,3,4-oxadiazole-2-thione (1, HL5), has been synthesized and characterized; its three new functional d¹⁰ transition-metal complexes, [Zn(L5)₂(H₂O)₂] (2), [Cd(L5)₂]_n (3) and [Hg₂(L5)₄] (4), have been successfully obtained by a diffusion synthetic method and characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, thermogravimetric analysis, and photoluminescence. On the basis of the X-ray analyses, the radii of the metal ions are found to play an important role in determining the structures. The radii and nature of the metal ions can impart their influence on the coordination geometry of the d¹⁰ transition-metal atoms, which seems to be the main factor controlling the structures and luminescent properties of the reaction products in this system.     

A 2-D nickel coordination polymer with an unsymmetric ligand, 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione

A new nickel coordination polymer was obtained from an unsymmetric building block 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione (HL6) and Ni(NO₃)₂ · 6H₂O-afforded [Ni(L6)₂(H₂O)₂] _n (1) with a (4,4) network. Complex 1 exhibits moderate antimicrobial activity against Bacillus subtilis ATCC 6633 and Candida albicans ATCC 90028. Thermogravimetric data and magnetic moments for 1 have been investigated.     

Synthesis,structures and characterization of two new supramolecular coordination complexes with the ambidentate ligand 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione (Hpot)

Two new coordination supramolecular complexes based on a versatile and unsymmetrical 5-(4-pyridyl)-1,3,4-oxadiazole-2-thione (Hpot) and Mn^II and Ni^II have been synthesized and structurally characterized by single-crystal X-ray diffraction analysis. Reaction of MnCl₂?· 4H₂O with Hpot afforded a neutral mononuclear complex [Mn(pot)₂(H₂O)₄]?·?2H₂O (1), which exhibits a three-dimensional (3-D) supramolecule through versatile intermolecular O–H?···?X (X=O, N and S) hydrogen bond interactions. When using NiCl₂?·?6H₂O instead of MnCl₂?· 4H₂O under similar reaction conditions, a neutral mononuclear complex [Ni(pot)₂(H₂O)₄] (2) is also obtained, which does not exhibit intermolecular hydrogen bonds and π–π stacking interactions. It is very interesting that the pot anion exhibits different coordination modes in complexes 1 and 2. The IR spectra and the TGA for 1 and 2 have been investigated and discussed in detail.     

Synthesis, Crystal Structure, Antibacterial Activities and Theoretical Computation of 3-（2-Hydroxybenzly）-4-（4-isopropylbenzylideneamino）-（1H）-1,2,4-triazole-5-thione

1INTRODUCTION Recently,compounds containing pyrazole,imida-zole,triazole(including benzotriazole),pyridine,tetrazole and indole have attracted much interest because they exhibit some fungicidal activity,plant-growth regulating activity and antibacterial acti-vity[1～10].Schiff bases also constitute a good type of biologically active substructure[11～14],and the sulfur-containing Schiff bases are particularly effective.Studies of pyrazole Schiff base-type fungicides andtriazole compounds c…     

Nickel(II) and copper(II) complexes of 5-o-tolyl-[1,3,4]-oxadiazole-2-thione and ethylenediamine: syntheses,spectral, and structural characterization

The reaction of potassium [N′-(2-methyl-benzoyl)-hydrazinecarbodithioate [K⁺(H₂L)^?] with metal acetate yielded M(H₂L)₂ (M = Ni, Cu), which on reaction with excess ethylenediamine (en) formed mononuclear mixed ligand complexes [Ni(en)₂(tot)₂] (1) and [Cu(en)₂](tot)₂ (2). The complexes have been characterized by elemental analyses, IR, magnetic susceptibility, and electronic spectral studies. Molecular structures of [Ni(en)₂(tot)₂] (1) and [Cu(en)₂](tot)₂ (2) showed 5-(o-tolyl)-[1,3,4]-oxadiazole-2-thione coordinated through oxadiazole nitrogen in 1 and ionically bonded via thiol sulfur in 2.     

Syntheses and X-ray structural studies of the novel complexes [Ni(en)2(3-pyt)2] and [Cu(en)2](3-pyt)2 based on 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione

Two novel mononuclear mixed-ligand complexes [Ni(en)₂(3-pyt)₂] (1) and [Cu(en)₂](3-pyt)₂ (2), derived from potassium [N′-(pyridine-3-carbonyl)-hydrazinecarbodithioate [K⁺(H₂L)⁻] and containing en as a co-ligand, have been synthesized. The [K⁺(H₂L)⁻] undergoes cyclization in the presence of ethylenediamine (en) and is converted to 5-(3-pyridyl)-1,3,4-oxadiazole-2-thione (3-pyt)⁻. [Ni(en)₂(3-pyt)₂] and [Cu(en)₂](3-pyt)₂ have been characterized with the aid of elemental analyses, IR, UV–Vis, magnetic susceptibility and single crystal X-ray studies. The complexes 1 and 2 crystallize in the orthorhombic and monoclinic systems with space groups Pca2(1) and C2/c, respectively. The single crystal X-ray diffraction studies of both complexes indicate that (3-pyt)⁻ adopts a thione form in 1 but is present as a thiolato form in 2.     

Synthesis and Crystal Structure of 2-（ 4-Decarboxydehydroabietyl）- 5-p-tolyl-[ 1,3,4 ]-oxadiazole

2-（4-Decarboxydehydroabietyl）-5-p-toyl-[1,3,4]-oxadiazole, C28H34N2O, has been synthesized and characterized by IR, NMR, elemental analysis and single-crystal X-ray diffraction method. The crystal belongs to the orthorhombic system, space group P212121 with a = 6.1351（5）, b = 14.8495（19）, c = 25.9050（2） A, V = 2360.0（4） A3, Z = 4, Mr = 414.57, Dc = 1.167 Mg/m^3, 2 = 0.71073 A,μ（MoKa） = 0.070 mm^-1, F（000） = 896, the final R = 0.0452 and wR = 0.1076 for 1647 observed reflections with I 〉 2σ（I）. There are five rings in the crystal structure of the title compound, but the oxadiazole ring is non-coplanar with the benzene ring D.