共查询到20条相似文献,搜索用时 140 毫秒
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(1)利用Friedel-Crafts反應,由4-甲基-2-氧代-二氫化咪唑及四個不同的醯氯羧酸酯,得到下列四個化合物:4-甲基-5-(δ-乙氧羰基-γ-甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(δ-乙氧羰基-γ,γ-二甲基丁醯)-2-氧代-二氫化咪唑,4-甲基-5-(ω-乙氧羰基-正壬醯)-2-氧代-二氫化咪唑及4-甲基-5-(ω-乙氧羰基-正十七醯)-2-氧代-二氫化咪唑。 (2)用Cr_(2)O_3精製過的乙酸爲溶劑,PtO_2爲觸媒,這四個4-甲基-2-氧代-二氫化咪唑的衍生物,很順利的吸收相當於3分子的氫,還原為相對應的4-甲基-2-氧代-四氫化咪唑的衍生物,水解後得到下列四個酸:4-甲基-5-(δ-羧基-γ-甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(δ-羧基-γ,γ-二甲基丁基)-2-氧代-四氫化咪唑,4-甲基-5-(ω-羧基-正壬基)-2-氧代-四氫化咪唑及4-甲基-5-(ω-羧基-正十七基)-2-氧代-四氫化咪唑。前三者已作過初步的微生物效應試驗,對於lactobacillus casei及saccharomyces cerevisiae都有顯著的反促生素效應。第四個化合物因為在水中溶度太低,故尚未能作它的微生物效應試驗。 相似文献
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新型2-硫代-5-苯基亚甲基-4-咪唑啉二酮衍生物的合成 总被引:1,自引:3,他引:1
研究了用烯基膦亚按与芳基异氰酸酯、硫化钠/冰醋酸的串联aza-Witting反应合成2-硫代-5-苯基亚甲基-4-咪唑啉二酮衍生物的有效方法。提出了可能的环化反应机理,探讨了所合成化合物的成环反应条件和波谱性质。生成的环化产物均为新的化合物,其结构经元素分析、IR,^1H NMR和MS确证。 相似文献
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采用环状亚磷酸酯与亚胺的加成反应, 合成了9个未见文献报道的含吡啶基的α-氨基环状膦酸酯化合物. 其结构经1H NMR, 31P NMR, MS 和元素分析确证, 同时采用X射线单晶衍射对化合物3i的立体构型进行了进一步确证. 测定了该系列化合物的杀虫、杀菌和除草活性, 结果表明, 化合物的杀虫活性虽然较差, 但所有化合物在药液质量浓度为1.0×10-4 g/mL时都具有较好的除草活性, 部分化合物在5.0×10-5 g/mL时显示出良好的杀菌活性. 相似文献
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采用环状亚磷酸酯与亚胺的加成反应, 合成了9个未见文献报道的含吡啶基的α-氨基环状膦酸酯化合物. 其结构经1H NMR, 31P NMR, MS 和元素分析确证, 同时采用X射线单晶衍射对化合物3i的立体构型进行了进一步确证. 测定了该系列化合物的杀虫、杀菌和除草活性, 结果表明, 化合物的杀虫活性虽然较差, 但所有化合物在药液质量浓度为1.0×10-4 g/mL时都具有较好的除草活性, 部分化合物在5.0×10-5 g/mL时显示出良好的杀菌活性. 相似文献
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Benson M. Kariuki Bakr F. Abdel-Wahab Hanan A. Mohamed Mohamed S. Bekheit Gamal A. El-Hiti 《Molecules (Basel, Switzerland)》2022,27(24)
Reactions of 1-(5-methyl)-1H-1,2,3-triazol-4-yl)ethan-1-ones and benzaldehydes in ethanol under basic conditions gave the corresponding chalcones. Reactions of the chalcones combined with thiosemicarbazide in dry ethanol containing sodium hydroxide afforded the corresponding pyrazolin-N-thioamides. Reactions of the synthesized pyrazolin-N-thioamides and several ketones (namely, ethyl 2-chloro-3-oxobutanoate, 2-bromoacetylbenzofuran, and hydrazonoyl chloride) gave the corresponding novel 2-(1,2,3-triazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)thiazoles in high yields (77–90%). Additionally, 2-(4,5-dihydro-1H-pyrazol-1-yl)-4-(1H-1,2,3-triazol-4-yl)thiazoles were obtained in high yields (84–87%) from reactions with N-pyrazoline-thioamides and 4-bromoacetyl-1,2,3-triazoles under basic conditions. The structures of six of the newly synthesized heterocycles were confirmed by X-ray crystallography. 相似文献
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Sreenu Pavurala 《合成通讯》2014,44(5):583-588
An efficient synthesis of 3-(2-(4,5-dihydro-3,5-diphenylpyrazol-1-yl)thiazol-4-yl)-2H-chromen-2-one derivatives by a simple, atom-economical, and multicomponent reaction of chalcones, thiosemicarbazide, and 3-(2-bromoacetyl) coumarins in the presence of aqueous sodium hydroxide in refluxing ethanol is reported. The structures of newly prepared compounds have been confirmed by their analytical and spectral (IR, 1HNMR, 13CNMR and mass) data.
[Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] 相似文献
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以依达拉奉,丙酮酸和亚磺酸钠为原料,合成了依达拉奉衍生物2-(1-苯基-3-甲基-5-氧代-4-吡唑基)-2-磺基丙酸,总收率54%,纯度>99.9%,其结构经1H NMR,13C NMR和HR-MS确证。 相似文献
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异喹啉酮类化合物具有重要药理活性,本文在合成1,2,3,4-四氢-2-苄基异喹啉酮-4衍生物的基础上,参照Hinton方法制备2-异丙基-1,3-二氢-4(1H)异喹啉酮(1),用(1)进一步与芳醛、羟胺、酰氯及苯肼反应得到了相应的衍生物(3a-6e)。 相似文献
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根据苯并吡喃类钾通道开放剂的作用机理和构效关系, 设计合成了13个苯并吡喃-4-异硫脲衍生物, 其结构经IR, 1H NMR, MS和元素分析确证. 大鼠体外血管扩张实验研究表明, 多数化合物在1×10-5 mol•L-1 浓度下对30 mmol•L-1 KCl诱导的大鼠主动脉条收缩具有一定程度的抑制作用, 其中化合物6l的血管收缩抑制活性较强. 相似文献
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R. R. Gataullin R. R. Ishberdina A. M. Sotnikov I. B. Abdrakhmanov 《Russian Journal of Applied Chemistry》2005,78(3):438-440
Alkenylation of 6-methyl-2-(2-cyclohexen-1-yl)- and 2-(1-cyclohexen-1-yl)anilines with piperylene in the presence of AlCl3 and transformation of the resulting cyclohexenylanilines into carbazole structures were studied.__________Translated from Zhurnal Prikladnoi Khimii, Vol. 78, No. 3, 2005, pp. 441–443.Original Russian Text Copyright © 2005 by Gataullin, Ishberdina, Sotnikov, Abdrakhmanov. 相似文献
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E. Vishnu Vardhan Reddy P. Bhanu Prakash Sandip Khobare J. Ramanatham N. Devanna 《合成通讯》2013,43(3):414-422
Novel 1-methyl-2-(2-substituted-oxazol-4-yl)-1H-benzimidazole derivatives were obtained in good yields and purity by treating corresponding 2-benzimidazolyl esters with acetamide in the presence of BF3-etherate, a Lewis acid. 相似文献
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An efficient synthesis of 3-(3-methyl-1-aryl-1H-pyrazol-5-yl)-2H-2-chromen-2-one derivatives by the reaction of salicylaldehydes, 4-hydroxy-6-methyl-2H-pyran-2-one, and arylhydrazine in acetonitrile under reflux condition and in the presence of piperidine is reported. This three-component reaction has some advantages such as ease of handling, good yields, and easy purification. All structures were confirmed by infrared, mass, 1H NMR, and 13C NMR spectroscopy. 相似文献
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Vladimir Mironov Gulnara Ivkova Liliya Abdrakhmanova Liliya Burnaeva Kristina Kuzmina 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1-3):162-163
Abstract 2-(5-Methyl-2-phenyl-2Н-1,2,3-diazaphosphol-4-yl)-4H-benzo[d]-1,3,2-dioxaphosphorin-4-one 1 readily reacts with hexafluoroacetone, mesoxalic acid diethyl ester, trifluoropyruvic acid ethyl ester and chloral to give 2-(5-methyl-2-phenyl-2H-1,2,3-dizaphosphole-4-yl)-derivatives of 1,3,2- and 1,4,2-dioxaphosphepines. 相似文献