新型咪唑[2,1-b][1,3,4]噻二唑衍生物的合成及Cdc25B抑制活性

大量研究表明,细胞分裂周期25磷酸酯酶B(Cdc25B)在许多癌症中都是过度表达的,如乳腺癌、结肠癌、子宫颈癌、肺癌等.因此,抑制Cdc25B是治疗癌症的一种潜在方法.采用微波辐射法,合成出了20个新的2,6-二芳基-咪唑[2,1-b][1,3,4]噻二唑衍生物4,然后再经Vilsmeier-Haack反应,合成出了19个新的2,6-二芳基-咪唑[2,1-b][1,3,4]噻二唑-5-甲醛(5).利用IR,1H NMR和元素分析对新的中间体化合物3及目标产物4和5进行了结构表征.对所合成的目标化合物4和5进行了Cdc25B抑制活性筛选.实验结果表明,在浓度为5μg/mL时,目标化合物4c对Cdc25B的抑制活性最高,抑制率为87.68%,目标化合物4o和5m具有中等的抑制活性,其抑制率分别为55.76%和57.69%.它们是潜在的Cdc25B抑制剂.     

1,3,4-均三唑并[2,1-b]-1,3,4-噻二唑衍生物的合成及生物活性

以5-对甲苯基-1-氨基-2-巯基-1,3,4-均三唑和取代苯氧乙酰异硫氰酸酯为原料, 合成了10个未见文献报道的5-对甲苯基-2-取代苯氧乙酰氨基均三唑并[2,1-b]-1,3,4-噻二唑类化合物, 通过元素分析, 1H NMR, IR和MS确定化合物的结构, 初步生物活性测试表明目标化合物具有较好的除草活性.     

含有异噁唑的S-三唑[3,4-b]-1,3,4-噻二嗪、咪唑[2,1-b]-1,3,4-噻二唑和咪唑[2,1-b]-1,3,4-噁二唑衍生物的合成

异噁唑衍生物作为一类重要的生物活性物质,其合成一直受到人们的关注,其中德国HMR公司开发研制的新型抗内风湿性关节炎药来氟米特(Leftunomide)已于1998年在美国率先上市,该药还具有很好的免疫调节作用．7H-均三唑[3,4-b]-1,3,4-噻二嗪、咪唑并[2,1-b]噻唑和咪唑并[2,1-b]-1,3,4-噻二唑衍生物均表现出广谱的生物活性．     

碘促进3-(咪唑并[2,1-b][1,3,4]噻二唑-6-基)香豆素衍生物的有效合成

香豆素和咪唑并噻唑是两类具有广泛生物活性和药理作用的杂环化合物,合成含咪唑并噻唑基的香豆素衍生物在药物化学上具有重要意义。本研究发展了一种有效地通过3-乙酰基香豆素和2-氨基-1,3,4-噻二唑,在I_2促进下一锅环化反应合成3-(咪唑并[2,1-b][1,3,4]噻二唑-6-基)香豆素衍生物的方法。目标化合物通过核磁共振、红外光谱、质谱及元素分析进行了结构表征。     

含有1H-1,2,4-三唑咪唑[2,1-b]-1,3,4-噻二唑、S-三唑[3,4-b]-1,3,4-噻二唑衍生物的合成及生物活性

合成了18个含有1H-1,2,4-三唑的咪唑[2,1-b]-1,3,4-噻二唑以及S-三唑[3,4-b]-1,3,4-噻二唑的稠杂环衍生物,经元素分析及谱学表征,探讨2,5,6-三取代咪唑[2,1-b]-1,3,4-噻二唑的可能生成机制.对大肠杆菌、绿脓杆菌、枯草杆菌等初步抑菌试验证明,多数化合物表现了较好的抑菌活性.     

含有异(口恶)唑的S-三唑[3,4-b]-1,3,4-噻二嗪、咪唑[2,1-b]-1,3,4-噻二唑和咪唑[2,1-b]-1,3,4-(口恶)二唑衍生物的合成

异噁唑衍生物作为一类重要的生物活性物质[1,2],其合成一直受到人们的关注,其中德国HMR公司开发研制的新型抗内风湿性关节炎药来氟米特(Leftunomide)已于1998年在美国率先上市,该药还具有很好的免疫调节作用[3].7H-均三唑[3,4-b]-1,3,4-噻二嗪、咪唑并[2,1-b]噻唑和咪唑并[2,1-b]-1,3,4-噻二唑衍生物均表现出广谱的生物活性[4～6].     

含吡唑取代基的1,2,4-三唑[3,4-b]-1,3,4-噻二唑类衍生物的合成及生物活性

以4-氨基-5-巯基-1,2,4-均三唑的衍生物和5-吡唑甲酸及其衍生物为原料,设计合成21个未见报道的新的3-取代-6-吡唑基-1,2,4-三唑[3,4-b]-1,3,4-噻二唑类化合物.通过IR和1H NMR及元素分析对化合物结构进行表征.小麦芽鞘法对目标化合物生长活性测试结果表明,所合成的化合物均表现出不同程度的生长活性;抑菌活性测试结果表明部分化合物表现出较好的抑菌活性.其中化合物3g和3h的活性最好,与氯霉素相似.对大肠杆菌和金黄色葡萄球菌的抗菌药物最低抑菌浓度(MIC值)3g达到6.25和3.13 mg/L,3h达到12.5和6.25 mg/L.     

含三唑基的新型咪唑[2,1-b]-1,3,4-噻二唑的合成及表征

以2-(2-苯基-1,2,3-三唑-4-基)-5-氨基-1,3,4-噻二唑(1)为原料分别与ω-溴代芳基乙酮、ω-溴代-ω-(1H-1,2,4-三唑-1-基)芳基乙酮反应, 合成了一系列新型咪唑[2,1-b]-1,3,4-噻二唑类化合物2a～2e和3a～3e. 其结构经IR, ¹H NMR和MS及元素分析确证.     

新型1,2,4-三唑并[3,4-b]-1,3,4-噻二唑类衍生物合成及其抗病毒活性

以没食子酸为先导,经甲基醚化、无溶剂闭环、缩合反应合成了8个未见文献报道的1,2,4-三唑并[3,4-b]-1,3,4-噻二唑类衍生物,其结构经1H NMR,13C NMR,IR和元素分析表征.初步生物活性测试结果表明,部分化合物具有一定的抗黄瓜花叶病毒活性.     

3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑的 合成及生物活性

利用3-芳基-4-氨基-5-巯基-1,2,4-均三唑和对氯苯甲酰异硫氰酸酯在乙腈中反应, 得到一系列3-芳基-6-对氯苯甲酰氨基均三唑并[3,4-b]-1,3,4-噻二唑, 用1H NMR, IR, MS和元素分析确定了其结构, 并对其进行了抑菌活性测试.     

Synthesis and Pharmacological Evaluation of Some Novel Imidazo[2,1-b][1,3,4]thiadiazole Derivatives

Synthesis of bis‐1,3‐{6′‐arylimidazo[2,1‐b][1,3,4]thiadiazol‐2‐yl}‐1,2,2‐trimethylcyclopentane ( 3 ), bis‐1,3‐{thiadiazolo[2′,3′:2,1]imidazo[4,5‐b]quinoxalinyl}‐1,2,2‐trimethylcyclopentane ( 5 ) has been achieved by the reaction of bis‐(5′‐amino‐1′,3′,4′‐thiadiazolyl)‐1,2,2‐trimethylcyclopentane with α‐haloketones, 2,3‐dichloroquinoxaline respectively. Bromination of compound 3 furnished bis‐1,3‐{5′‐bromo‐6′‐arylimidazo[2,1‐b][1,3,4]thiadiazol‐2‐yl}‐1,2,2‐trimethylcyclopentane ( 4 ). The structural assignment of these compounds was supported by IR, ¹H NMR and elemental analysis data. The antimicrobial, anti‐inflammatory and antifungal activities of some of the compounds have also been evaluated.     

Intramolecular amidation: synthesis of novel imidazo[2,1-b][1,3,4]thiadiazole and imidazo[2,1-b][1,3]thiazole fused diazepinones

Novel heterocyclic systems 2-alkyl/aryl-9-(2-hydroxybenzylidene)-7,9-dihydro-8H-[1,3,4]thiadiazolo[2′,3′:2,3]imidazo[4,5-d][1,2]diazepin-8-one and 9-(2-hydroxy-benzylidene)-3,3-dimethyl-3,4,7,9-tetrahydro-2H-11-thia-4b,6,7,10-tetraazaindeno[1,2-a]azulene-1,8-dione are synthesized via an intramolecular amidation reaction. An interesting ring opening and cyclization of 2-alkyl/aryl-6-(2-oxo-2H-chromen-3-yl)imidazo[2,1-b][1,3,4]thiadiazole-5-carbaldehyde and 6,6-dimethyl-8-oxo-2-(2-oxo-2H-chromen-3-yl)-5,6,7,8-tetrahydroimidazo[2,1-b][1,3]benzothiazole-3-carbaldehyde are discussed.     

Synthetic pathway for a new series of liquid crystal 2,6-disubstituted imidazo[2,1-b][1,3,4]thiadiazole

Herein, the synthesis of a novel series of liquid crystals 2,6-disubstituted imidazo[2,1-b]-1,3,4-thiadiazoles derivate is reported. These fused heterocyclic compounds were prepared through the cyclodehydration between 5-substituted-1,3,4-thiadiazole-2-amino derivatives and α-bromo aryl ketones. The derivates of 2-amino-thiadiazole were obtained from the condensation reaction between thiosemicarbazide and aryl/alkyl nitriles with good yields (60–83%). The α-bromination of aryl ketones was carried out using NBS as the source of electrophilic bromine, also with good yields (52–85%). For the final compounds, the liquid crystal behaviour was shown to be dependent on the number of chains. Mesomorphism was not observed for compounds without aliphatic chains, with more than two aliphatic chains or when the aliphatic chains are methoxy groups.     

One-Pot Synthesis and Fungicidal Activities of Derivatives of Imidazo [2,1-b]-1,3,4-thiadiazol-5(6H)-one

The isothiocyanates 2, obtained from aza-Wittig reactions of vinyliminophosphoranes 1 with CS ₂ , reacted with hydrazine to give 3-amino-2-thioxo-4-imidazolidinones 4. One-pot reactions of 4, aromatic isocyanates, Ph ₃ P, C ₂ Cl ₆ , and Et ₃ N generated imidazo[2,1-b]-1,3,4-thiadiazol-5(6H)-ones 7. Compound 7 exhibited good fungicidal activities, especially against Sclerotinia sclerotiorum de Bary and Botrytis Cinerea Pers.     

Synthesis,Structure and Biological Activities of Novel 2‐(Trifluoromethyl)‐ 6‐arylimidazo[2,1‐b][1,3,4]‐thiadiazole (bis‐)Mannich Base Derivatives Containing Substitutedpiperazine Moiety

A convenient and practicable method for the synthesis of the novel 2‐(trifluoromethyl)‐6‐arylimidazo[2,1‐b][1,3,4]‐thiadiazole (bis‐)Mannich base derivatives containing various substitutedpiperazine motif has been developed based on the fused‐heterocycle intermediate. The new structures were identified through melting points, ¹H NMR, ¹³C NMR, ¹⁹F NMR, elemental analysis (or HRMS) and X‐ray single‐crystal diffraction. The pesticidal bioassays showed that some of compounds exhibited good fungicidal activities against Cercospora arachidicola, Physalospora piricola and Rhizoctonia cereali at 50 mg/L; some of them displayed favourable insecticidal activities against oriental armyworm (Mythimna separata Walker) at 200 mg/L, particularly, Vk and Vm with mortality rate of 75% and 80% respectively, could be considered as new insecticidal lead compounds for further structural optimization.     

Synthesis and Crystal Structure of 3-Benzyl-6-trichloromethyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole

The title compound 3-benzyl-6-trichloromethyl-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazole I （C11HTC13N4S, Mr = 333.62） has been synthesized, and its structure was determined by elemental analyses, IR, ^1H NMR, ^13C NMR, and X-ray diffractions. The crystal is of triclinic, space group P1^-, with a = 5.898（3）, b = 10.510（4）, c = 11.580（5） A, α = 74.936（7）, β= 75.476（7）, γ = 79.647（7）°, V= 665.9（5）/A^3, F（000） = 336, Z= 2, Dc = 1.664 g/cm^3, 2 = 0.71073A, p = 0.834 mm^-1, the final R = 0.0605 and wR = 0.0900. The secondary bonding interactions （SBIs） S…N and π-π stacking interactions are found in the crystal structure and they link the molecules into a three-dimensional network.     

咪唑[2，1-b]噻唑多胺缀合物的合成与表征

以2-氨基噻唑和溴乙酰基吡啶为原料合成了二个咪唑[2,1-b]噻唑的甲酰基化合物3,4,然后与N1-氨基丁基-N1,N4-二叔丁氧羰基-1,4-丁二胺经缩合后用NaBH4还原,产物提纯后脱保护得目标产物7、8,并通过IR,^1H NMR,^13C NMR,ESI-MS对目标化合物的结构进行了表征．     

含双-三唑并噻二唑环的庚烷类衍生物的合成及抗菌活性

The aroylhydrazides were prepared by esterification and hydrazinolysis of corresponding aromatic carboxylic acids.The reaction of aroylhydrazides with CS2/KOH in absolute ethanol gave potassium aroyldithiocarbazates and then hydrazinolysis of potassium aroyldithiocarbazates with hydrazine hydrate afforded 3-aryl-4-amino-5-mercapto-1,2,4-triazoles(1a～1g).New seven compounds of bis[(3-aryl)-s-triazolo[3,4-b]-[1,3,4]thiadiazole derivatives(2a～2g) were synthesized in high yields by cyclization of nonanedioic ac...