共查询到20条相似文献,搜索用时 9 毫秒
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Klmn Harsnyi 《Journal of heterocyclic chemistry》1973,10(6):957-961
Interconversion of 3-(2-hydroxyphenyl)-1,2,4-oxadiazoles (1) and 3-acylaminobenzisoxazoles (2) was observed in the presence of base carboxylate anion, triethylamine, alkali hydroxide, alcoholate. With proton transferring reagents (carboxylate, triethylamine) the equilibrium 1?2 is dependent on the substituent R; with anionic reagents (hydroxy anion, ethoxyl anion) the less basic anion of 1 is preferred. Alcohol effects further transformation of this anion and the alcohol adduct anion (6) is subject both to hydrolysis and alcoholysis (7) to yield 3-amino-benzisoxazole (3). 相似文献
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报道了以苯酚和三氟丙酮酸乙酯为起始原料,在温和条件下合成高产率的2-(4-羟基苯基)-3,3,3-三氟丙酸乙酯的一条新途径.该途径包括无水碳酸钾催化的苯酚与三氟丙酮酸乙酯间的亲电取代反应、由此形成的产物的选择性侧连羟基的氯代反应和随后的硼氢化钠还原反应. 相似文献
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I. E. Tolpygin 《Russian Journal of Organic Chemistry》2012,48(1):104-108
A number of 2-(anthracen-9-yl)-substituted imidazolidines and hexahydropyrimidines were synthesized by reaction of N,N′-bis[aryl(hetaryl)methyl]ethylene-1,2-diamines and N,N′-bis[aryl(hetaryl)methyl]-propane-1,3-diamines with anthracene-9-carbaldehyde. The obtained compounds showed chemosensor
activity toward Cd2+, Cu2+, and Hg2+ ions. 相似文献
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Malichenko N. A. Krasnoshchek A. P. Medvedeva T. P. Yagupol'skii L. M. 《Chemistry of Heterocyclic Compounds》1976,12(9):1045-1048
A convenient method is proposed for the preparation of -(2-benzimidazolyl) perfluorinated carboxylic acids and their amides by condensation of o-phenylenediamine with imides of perfluorinated dicarboxylic acids. The transformations of the o-aminoanilides of the amides of the perfluorinated dicarboxylic acids were studied by thermal analysis and mass spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1262–1265, September, 1976. 相似文献
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在强极性的醇酸体系中,利用Knorr-Paal反应制得了呋喃联吡咯系的13个新化合物,并进行了红外光谱、质谱、核磁共振谱及元素分析测定。 相似文献
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以2-巯基-5-(2-羟基苯基)-1,3,4-噻二唑为原料,经硫醚化、肼解、腙化反应合成了9个5-(2-羟基苯基)-1,3,4-噻二唑-2-硫基乙酰腙化合物,其结构由1H NMR,13C NMR,IR,MS表征和元素分析,并初步研究了目标化合物的抑菌活性.结果表明它们大多数具有优良的抑菌活性,芳香醛-5-(2-羟基苯基)-1,3,4-噻二唑-2-硫基乙酰腙(4a~4h)比2-丁烯醛-5-(2-羟基苯基)-1,3,4-噻二唑-2-硫基乙酰腙(4i)有更好的抑菌活性. 相似文献
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Reactions of N-tosylimidoyl chlorides with the Schiff bases of the general formula TsNH(CH2)nN=CHR (n = 2 or 3; R = Pri, 4-MeOC6H4, 4-Me2NC6H4, and 3-O2NC6H4) afforded 2-substituted 1-tosyl-3-(1-tosyliminoalkyl)imidazolidines (n = 2) or-hexahydropyrimidines (n = 3).
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 872–875, May, 2006. 相似文献
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Synthesis and anticholinesterase activities of O-phosphorylated derivatives ofd-allylpseudoephedrine
S. D. Fazylov A. M. Gazaliev K. D. Mukanova E. B. Maizel' A. E. Khovanskikh A. B. Tateeva 《Chemistry of Natural Compounds》1994,29(3):373-375
An immunochemical investigation has been made of the culture liquid after the cultivation of ten strains of the microorganisms Yersinia pseudotuberculosis. It has been shown that in the process of vital activity all the strains investigated, to a greater or smaller degree, produce into the culture medium products of catabolic breakdown consisting of fragments of receptor proteins which are possibly, regulators of metabolic processes taking place under the influence of the constantly changing conditions of the growth medium.Pacific Ocean Institute of Bioorganic Chemistry, Far Eastern Branch, Russian Academy of Sciences, Vladivostok. Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 436–439, May–June, 1993. 相似文献
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The literature data on methods for the synthesis of 2-aminooxazoles and their benzo derivatives and their physicochemical properties and transformations are correlated.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1011–1024, August, 1981. 相似文献
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采用稳态和瞬态荧光法对2-(2-羟苯基)苯并噻唑(HBT)与七元瓜环(CB7)的超分子作用及CB7分子纳米腔限制作用对HBT激发态质子转移(ESIPT)过程进行了研究,并采用Benesi-Hildebrand方程对荧光数据进行处理,以确定超分子复合物的组成比.结果表明,在N,N-二甲基甲酰胺(DMF)和二氯甲烷溶液中,CB7与HBT的作用均形成化学计量比为1∶1的主客体复合物,HBT的质子转移对溶剂很敏感,CB7的加入,使HBT的荧光寿命降低,量子产率增大.在DMF溶液中,CB7的加入促进了酚氧负离子的形成,而在二氯甲烷溶液中,CB7的加入限制了HBT的激发态质子转移.结构优化计算表明,CB7与HBT能形成化学计量比为1∶1的复合物. 相似文献
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A variety of 2-(1-arylcarbonyl-1-arylazomethylidene)-imidazolidines 3 were prepared by the reaction of 2-(arylcarbonylmethylidene)-imidazolidines 1 with diazobenzenes 2 in moderate to excellent yields. 相似文献