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1,3,4-噁二唑类化合物合成及应用的研究新进展 总被引:1,自引:0,他引:1
1,3,4-噁二唑类化合物因具有独特的生物活性和光学活性而被广泛研究,该类化合物在农药、医药、材料等领域有广泛应用。将1,3,4-噁二唑环引入不同的化合物结构中,通过结构修饰能生成一系列具有广谱生物活性的化合物及电致发光材料。因此,1,3,4-噁二唑衍生物的合成也成了人们研究的热点。文章综述了近年来合成1,3,4-噁二唑类化合物的传统方法、微波辅助合成法、固相合成法,对其在医药、材料等方面的应用进行了总结,并对其发展趋势和应用前景作了展望。 相似文献
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以5-(4-硝基苯基)-1 H-吡唑-3-甲酸乙酯(1)为起始原料,经肼解和关环合成了中间体5-[5-(4-硝基苯基)-1 H-吡唑-3-基]-2-巯基-1,3,4-噁二唑(3)。在超声作用下,以乙腈为溶剂,固体K2CO3为缚酸剂,使化合物3与卤代烃反应合成4个含取代吡唑基的1,3,4-噁二唑硫醚类化合物4a~4d,该法具有反应时间短、产率较高和操作简便等特点。产物结构经元素分析、IR、1 H NMR表征。 相似文献
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三唑类杀菌剂是目前世界公认的最有效最有前途的杀菌剂,以其高效、广谱的杀菌和植物生长调节活性而广受关注,如三唑酮、三唑醇、烯效唑、烯唑醇等,对常见真菌病害具有很好的防治效果,并具有增产、抗倒和生长调节作用,已成为重要的杀菌剂类型。 相似文献
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三唑类化合物具有广泛的生物活性。以2-羟基-5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶为原料,在缚酸剂存在下,于室温分别和苯磺酰氯、对甲苯磺酰氯进行酯化反应,合成了两个新型的5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶-2-芳磺酸酯化合物a和b。产物经质谱、红外光谱、核磁共振谱确证。初步生物活性表明,该化合物具有一定的杀菌活性和除草活性,其中a有较高除草活性,而b对禾本科植物有较好的促进生长活性。 相似文献
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Zuming Liu Guangfu Yang Xianghua Qin 《Journal of chemical technology and biotechnology (Oxford, Oxfordshire : 1986)》2001,76(11):1154-1158
In a search for novel agrochemicals with high activity and low toxicity, a series of diheterocyclic compounds containing 1,2,4‐triazolo[1,5‐a]pyrimidine and 1,3,4‐oxadiazole rings were designed and synthesized by a four‐step synthetic route starting from 2‐mercapto‐5,7‐dimethyl‐1,2,4‐triazolo[1,5‐a]pyrimidine. The structures of all the compounds synthesized were confirmed by 1H NMR, mass spectroscopy and elemental analysis. The preliminary bioassay against Brassica campestris L and Echinochloa crusgalli Beavu indicated that the title compounds displayed herbicidal activity at the concentration of 100 ppm and that compounds 5a (R = CH3), 5d (R = C2H5) and 5f (R = i‐Bu) were found to have particularly high activities. In addition, the results of an in vivo test at a concentration of 50 ppm showed that all the compounds prepared were highly active against Rhizoctonia slain, but not active against Fusarium oxysporum, Gibberella zeave and Phoma sparagi. A further in vivo test showed that compound 5j possessed better fungicidal activity against Rhizoctonia solani at a concentration of 200 ppm than Carbendazim and Validamycin A, which are well known for their fungicidal activity against Rhizoctonia solani. To our knowledge, this is the first report that 1,2,4‐triazolo[1,5‐a]pyrimidine derivatives display fungicidal activity against Rhizoctonia solani. © 2001 Society of Chemical Industry 相似文献
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《Journal of Sulfur Chemistry》2013,34(6):595-603
Reaction of 5-(4-chlorophenyl)-2-thioxo-2,3-dihydro-1H-indeno[2',1':5,6] pyrido[2,3-d]pyrimidine-4,6-dione with hydrazonoyl chlorides gave 1,2,4-triazolo[4,3-a]pyrimidine derivatives regioselectively in good yields. The structures of the newly synthesized compounds are established on the basis of chemical and spectroscopic evidence as well as their synthesis by alternative methods. 相似文献
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Four novel 2,5-bis[4-(2-arylvinyl)phenyl]-1,3,4-oxadiazoles that exhibit strong two-photon absorption and enhanced two-photon
excited fluorescence were designed and synthesized based on “push-core-pull-core-push” molecules built from embedding electron-transporting
1,3,4-oxadiazole in aromatic conjugated system through Wittig-Horner reaction. Their chemical structures were determined to
show trans-vinylene character according to infrared (IR) and 1H nuclear magnetic resonance (NMR) spectra. A very effective energy transfer from the excited units to the π-conjugated bridging
unit can enhance the two-photon absorption and two-photon fluorescence.
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Translated from Journal of Southeast University (Natural Science Edition), 2006, 36(5): 795–798 [译自: 东南大学学报 (自然科学版)] 相似文献
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三唑类化合物具有广泛的生物活性.以2-羟基-5,7-二甲基-l,2,4-三唑并[1,5-a]嘧啶为原料,在缚酸剂存在下,于室温分别和苯磺酰氯、对甲苯磺酰氯进行酯化反应,合成了两个新型的5,7-二甲基-1,2,4-三唑并[1,5-a]嘧啶-2-芳磺酸酯化合物a和b.产物经质谱、红外光谱、核磁共振谱确证.初步生物活性表明,该化合物具有一定的杀菌活性和除草活性,其中a有较高除草活性,而b对禾本科植物有较好的促进生长活性. 相似文献
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MMA经溴化加成、醚化、催化裂化制得双甲醋;单氰胺与二硫化碳在碱性条件下缩合、甲基化制备二氰醋,后与正丙胺缩合再与水合肼环合,丙三唑与苯甲醛醛缩;醛缩物在缚酸剂下与双甲醋催化闭环生成环合物。再在盐酸中水解去醛基得三唑嘧啶酮成品。分别选择car1#、cat2#为裂解和闭环催化剂,反应收率分别达91.59%,91.98%,91.1%,86.6%,69.7%,总收率46.32%,产品纯度99.53%。 相似文献