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微波辐射下以取代苯胺1, 2-溴芳基乙酮2为原料, 在无催化剂条件下一步合成了一系列2-取代吲哚3. 该方法具操作简单、反应时间短、产率高等特点. 相似文献
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Numerous benzothiazole derivatives are used in organic synthesis, in various industrial and consumer products, and in drugs, with a wide spectrum of biological activity. As the properties of the benzothiazole moiety are strongly affected by the nature and position of substitutions, in this review, covering the literature from 2016, we focus on C-2-substituted benzothiazoles, including the methods of their synthesis, structural modification, reaction mechanisms, and possible pharmacological activity. The synthetic approaches to these heterocycles include both traditional multistep reactions and one-pot atom economy processes using green chemistry principles and easily available reagents. Special attention is paid to the methods of the thiazole ring closure and chemical modification by the introduction of pharmacophore groups. 相似文献
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A facile and inexpensive method for the synthesis of 2‐substituted benzothiazoles has been developed by Na2S2O4‐mediated cyclocondensations of 2,2′‐disulfanediyldianilines with aldehydes. In the presence of Na2S2O4 and 4 Å molecular sieves, a variety of 2‐substituted benzothiazoles were obtained from the reaction of 2,2′‐disulfanediyldianilines with aldehydes in moderate to high yields. 相似文献
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Yu. A. Moskvichev N. P. Gerasimova A. N. Pashinin P. V. Korikov N. A. Nozhnin E. M. Alov O. S. Kozlova 《Chemistry of Heterocyclic Compounds》2001,37(9):1162-1167
The reaction of nitriles and of methyl imino ester hydrochlorides of arylsulfonyl(thio)propionic acids with o-phenylenediamine, o-aminophenol, and o-aminothiophenol has been studied. A series of new 2-substituted benzazoles has been synthesized containing arylsulfonyl(thio)propionic acid fragments. 相似文献
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A series of 5-arylidene-2-imino-4-thiazolidinone derivatives were synthesized by the cross-aldol condensation of aromatic aldehydes with 2-imino-4-thiazolidinone in sodium acetate/acetic acid under microwave irradiation. The reactions were completed in 10 min with 63–91% yields, were environmental benign, and had easy workup. 相似文献
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Benzothiazole is used as a building block in organic synthesis, which serves as a key template for the development of various therapeutic agents and shows a wide spectrum of activities. The attractive application of benzothiazole in organic synthesis is undoubtedly due to the highly reactive C-2 amino group, which is responsible for the change in its bioactivity. The construction of a poly-heterocyclic compound with the fused hetero-systems has attracted increasing attention because of the diverse range of potential therapeutic activities. Significant efforts have been undertaken to exploit different synthetic routes to these compounds. This article gives a comprehensive account of the synthetic utility of benzothiazole employed in the design and synthesis of different types of compounds containing fused heterocyclic rings with greater emphasis on recent literature. 相似文献
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微波固相剥离法制备功能化石墨烯及其电化学电容性能研究(英文) 总被引:2,自引:0,他引:2
通过微波固相剥离氧化石墨制备了功能化石墨烯材料。石墨烯的剥离,是由于微波加热过程中氧化石墨烯片上的官能团分解为CO2和H2O,产生的压力超过了片层间的范德华力。形貌表征显示了石墨烯的有效剥离和纳米孔结构的形成。红外光谱分析结果表明微波剥离的功能化石墨烯仍然有少量的官能团残留。N2等温吸附-脱附测试结果表明样品具有高比表面积(412.9m2·g-1)和大孔容(1.91cm3·g-1)。电化学测试结果表明功能化石墨烯具有良好的电化学电容行为和207.5F·g-1的比电容。 相似文献
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微波辐射无溶剂条件下,以Zr(sO4)2·4H2O/SiO2固体酸为催化剂,芳香醛与芳香磺酰胺反应合成了一系列芳香磺酰亚胺化合物.此方法具有操作简便,催化剂价廉易得、活性高、可回收重复使用、对环境友好等优点. 相似文献
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Catalytic conversion of carbohydrates into value-added products and platform chemicals became a trend in recent years. Microwave activation used in the processes of carbohydrate conversion coupled with the proper choice of catalysts makes it possible to enhance dramatically the efficiency and sometimes the selectivity of catalysts. This mini-review presents a brief literature survey related to state-of-the-art methods developed recently by the world research community to solve the problem of rational conversion of carbohydrates, mostly produced from natural resources and wastes (forestry and agriculture wastes) including production of hydrogen, synthesis gas, furanics, and alcohols. The focus is made on microwave technologies used for processing carbohydrates. Of particular interest is the use of heterogeneous catalysts and hybrid materials in processing carbohydrates. 相似文献
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微波辐射无溶剂条件下, 以Zr(SO4)2•4H2O/SiO2固体酸为催化剂, 芳香醛与芳香磺酰胺反应合成了一系列芳香磺酰亚胺化合物. 此方法具有操作简便, 催化剂价廉易得、活性高、可回收重复使用、对环境友好等优点. 相似文献
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Hemant P. Narkhede Uttam B. More Dipak S. Dalal Nilesh S. Pawar Dhananjay H. More 《合成通讯》2013,43(4):573-577
Microwave‐assisted, solvent‐free alkylation and acylation of 2‐mercaptobenzothiazole has been attempted using silica gel, alumina, and a new solid support, fly ash. Fly ash, a waste generated at thermal power stations, could be used as solid support just as efficiently as commercial supports. The additional features of methodology include a much faster reaction, easy workup, higher yields, higher purity of the products, and an ecofriendly approach. 相似文献
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Lei Liu Fa Zhang Hongliang Wang Bo Liu Hailong Hong 《Phosphorus, sulfur, and silicon and the related elements》2017,192(4):464-468
2-Substituted benzothiazoles were synthesized through condensation of bis(2-aminophenyl) disulfides with arylaldehydes catalyzed by inexpensive NaSH in PEG-300 and assisted by low energy microwave irradiation(25 W). Various 2-substitutedbenzothiazoles were obtained in moderate to high yields after simple post-reaction processing including adding distilled water, filtrating, and drying. Moreover, it was found that the S-S bond of the disulfide was reduced by NaSH and also by the intermediate benzothiazoline. 相似文献
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The reactions of arylamine with ethyl acetoacetate catalyzed by a solid support are accelerated by microwave irradiation to result in a rapid and clean production of ethyl β-arylaminocrotonates. 相似文献
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Burgula Laxminarayana 《合成通讯》2013,43(11):1342-1353
Synthesis of selectively N-3-substituted pyrimidine nucleobases or pyrimidinones has always been a challenge because of poor regioselectivity and chemoselectivity. In this article we demonstrate a single-step, de novo synthesis of selectively N-3-substituted modified pyrimidinones. We have developed a microwave-assisted methodology for direct, chemoselective alkylation, benzylation, and arylation of C-5 and C-6 substituted pyrimidine nucleobases selectively at the N-3 position. The reactions were found to proceed, with high efficiency, without the requirement of solvent and were complete within 10–15 min of irradiation. The efficiency of the method was further improved by addition of a Lewis acid, which not only increases the yield significantly but also accelerates the reaction rate. 相似文献
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偏钒酸铵催化合成2-芳基取代苯并噁唑 总被引:2,自引:0,他引:2
在偏钒酸铵催化下,以2-氨基苯酚和芳醛为原料、乙醇为溶剂,在室温下合成了一系列2-芳基取代苯并噁唑类化合物.该方法具有操作简便、反应条件温和、产率高等优点. 相似文献