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本文利用2-吡啶醛或4-吡啶醛与1-(1H-1.2.4-三唑-1-基)酮发生羟醛缩合反应,合成了一类新型的三唑类化合物3和4,其结构经元素分析、1HNMR和IR及MS所确证.通过生物活性测试结果表明,目标化合物具有很好的杀菌活性,同时也有较好的除草活性和植物生长调节活性. 相似文献
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α-四氢萘酮的乙氧羰基腙(1)经LTA氧化, 得到α-偶氮-α-乙酰氧基化合物2. 在AlCl3作用下, 化合物2脱去乙酰氧基产生重氮正离子中间体3, 再经与腈的1,3-偶极环加成、 [1,2]-迁移扩环、碱性水解和与苦味酸作用, 得到新型[1,2,4]-三唑并[1,5-a][1]苯并氮杂(艹卓)苦味酸盐6a~6c. 以2,3-二氢-1-茚酮为底物, 采用相同的合成路线, 合成了1,2,4-三唑并[1,5-a]-二氢喹啉苦味酸盐12a~12c. 相似文献
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α-四氢萘酮的乙氧羰基腙(1)经LTA氧化,得到α-偶氮-α-乙酰氧基化合物2.在A lC l3作用下,化合物2脱去乙酰氧基产生重氮正离子中间体3,再经与腈的1,3-偶极环加成、[1,2]-迁移扩环、碱性水解和与苦味酸作用,得到新型[1,2,4]-三唑并[1,5-a][1]苯并氮杂苦味酸盐6a~6c.以2,3-二氢-1-茚酮为底物,采用相同的合成路线,合成了1,2,4-三唑并[1,5-a]-二氢喹啉苦味酸盐12a~12c. 相似文献
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以4-氨基-5-(3,4,5-三甲氧基苯基)-3-巯基-1,2,4-三唑为原料,环化得到6-巯基-3-(3,4,5-三甲氧基苯基)-1,2,4-三唑[3,4-b][1,3,4]噻二唑再与取代苄氯反应,得到9个6-取代苄硫基-3-(3,4,5-三甲氧基苯基)-1,2,4-三唑[3,4-b][1,3,4]噻二唑类衍生物3a~3i.其结构经IR,1H NMR,MS和元素分析确证.初步生物活性测试结果表明部分化合物有一定的杀菌活性. 相似文献
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以2-苄硫基-5-甲基-7-羟基-1,2,4-三唑并[1,5-a]嘧啶为原料,经醚化、肼解、成盐、关环和席夫碱反应合成了20个新型的含1,2,4-三唑-5-硫酮席夫碱的1,2,4-三唑并[1,5-a]嘧啶类化合物,通过IR,1H NMR,MS和元素分析对所合成的化合物进行了结构表征.初步生物活性测试结果表明,部分化合物表现出一定的抑菌或较好的抗烟草花叶病毒(TMV)活性.在500μg/mL浓度下,化合物6b,6f和6p对TMV的抑制率分别为41%,43%和40%. 相似文献
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3-甲硫基-4-氨基-5-(吡啶-3-基)-1,2,4-三唑席夫碱的合成及抗肿瘤活性 总被引:2,自引:1,他引:1
以4-氨基-5-(吡啶-3-基)-1,2,4-三唑硫醇(1)为原料,经与碘甲烷硫醚化得3-甲硫基-4-氨基-5-(吡啶-3-基)-1,2,4-三唑中间体2,中间体2再与芳香醛缩合得相应目标化合物3a-3g.合成新化合物的结构经元素分析、IR、1H NMR、MS测试技术确证.采用MTT法研究了目标化合物体外抑制人肝癌细胞株SMMC-7721和Bel-7402的活性.结果表明,所合成的7个新化合物中,化合物3c、3e、3f对上述2种细胞株均表现出显著的体外抗癌活性,其IC50(μmol/L)值分别为3.8、2.0、1.3和2.5、2.5、1.1. 相似文献
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Syntheses of trimethylbisdehydro [23]- and -[25]annulenones have been described, and the examination of their 1H NMR spectra suggests the diatropicity and the paratropicity of the 25-membered and 25-membered rings, respectively. 相似文献
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A new preparative sequence from 2,3-polymethylene-2-cyclopentenone 5 to 2,6-polymethylenebromobenzenes 3 (n = 6, 7, 10) and 2,6-polymethylenephenyllithiums 6 has been found. The reaction of 6 with various electrophiles produces a number of new compounds to disclose the unique reactivity of the aryl C-Li moiety surrounded by the polymethylene chain. Photolysis of 3a and 3b provides transannular products 8, 10 and 11, all arising from the proximity between the aromatic bromine and the aliphatic hydrogen intraannularly opposed to be removed as HBr. Spectrometric study gives quantitative data of the dependence of the molecular geometry upon the chain length and the aromatic substituents. The energy barriers ΔGc≠ of the conformational flipping are 17·4 kcal/mol (Tc 76·5°) for [6]metacyclophane (7a), 11·5 kcal/mol (Tc ?28°) for [7]metacyclophane (7b), ·8 kcal/mol for [10]metacyclophane (7c). The lower-energy process of the aliphatic chain in [6]metacyclophane derivatives is the pseudorotation with substituent-dependent barrier ΔGc≠ 11·1 kcal/mol (Tc ?31·5°) for 7a, 12·4 kcal/mol (Tc ?4·5°) for 3a and 12·7 kcal/mol (Tc 1·0°) for 12a. The rather large rotational barrier is attributed to the compressed structure of each system. The benzene ring distortion of the cyclophanes is deduced from the bathochromic shift of the B-band and the diamagnetic shift of the benzene proton signals in the PMR. 相似文献
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The synthesis of novel imidazo[4,5-c]pyridines 11-13 and imidazo[4,5-b]pyridines 18-20 is described using 2 as the starting material. The synthesis is generally applicable for the introduction of a wide variety of substituents. 相似文献
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Gabrielle McMullen Gottfried Sedelmeier Rainer Hildebrand Hans Fritz Horst Prinzbach 《Tetrahedron letters》1979,20(40):3847-3850
Tris-[2.2.1]- and tris-[2.2.2]-σ-homobenzenes are synthesised by reaction of 1,1′-bicyclobutenyl with appropriate dienophiles and hydrogenation of the adducts. 相似文献