共查询到20条相似文献,搜索用时 78 毫秒
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噻唑并嘧啶类化合物的合成研究进展 总被引:2,自引:0,他引:2
综述了在医药和农药领域具有广泛用途的噻唑并嘧啶类化合物近二十年来合成方法上的研究进展. 结合本研究组在这一领域的工作介绍了噻唑并嘧啶类化合物的三种主要结构类型: 噻唑并[3,2-a]嘧啶、噻唑并[4,5-d]嘧啶、噻唑并[5,4-d]嘧啶类化合物的相关合成方法及新进展. 相似文献
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DL—β—(噻唑基)—α—乙酰氨基丙酸合成方法的改进 总被引:1,自引:0,他引:1
报道了由(4-噻唑基)-甲基乙酰氨基丙二酸二乙酯通过碱性水解并脱羧来合成外消旋β-(4-噻唑基)-α-乙酰氨基丙酸的新路线,产率可达80%,同时对前几步中间产物的合成进行了有效的改进。 相似文献
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利用溴乙酰基二茂铁为底物,与芳基取代硫脲在回流的乙醇介质中,以三乙胺作为碱,有效进行了Hantzsc反应,合成了一系列结构新颖的二茂铁基取代的氨基噻唑类化合物。选用四种菌株为研究对象,进行了初步的体外抗菌活性实验。结果表明,含有4-甲氧基取代的化合物7d和4-氟取代的化合物7h对革兰氏阳性菌枯草芽孢杆菌和革兰氏阴性菌大肠杆菌表现出很好的抑制活性,其MIC值分别为15.625/15.625μg/mL和15.625/7.8125μg/mL,相当或好于参考药物环丙沙星的活性。 相似文献
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根据活性基团拼接原理,以对羟基硫代苯甲酰胺和4,4,4-三氟-2-氯乙酰乙酸乙酯为原料,经环化反应制得中间体2-(4'-羟基)苯基-4-三氟甲基-5-噻唑甲酸乙酯(3);3与取代苄基氯或氯乙酸反应合成了5个新型的含醚结构噻唑类化合物(5a~5e),其结构经1H NMR,ESI-MS和元素分析表征。用离体平皿法考察了5a~5e对小麦赤霉病和纹枯病细菌的抑菌活性。结果表明,5a~5e均有一定的抑制活性。其中2-(4'-间氟苄氧基苯基)-4-三氟甲基噻唑-5-甲酸乙酯5c抑菌活性最好,对小麦赤霉病和纹枯病细菌的抑菌活性分别为37.8%和53.3%。 相似文献
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Helen A. Goulart Daniela R. Araujo Filipe Penteado Raquel G. Jacob Gelson Perin Eder J. Lenardo 《Molecules (Basel, Switzerland)》2021,26(24)
Oxone is a commercially available oxidant, composed of a mixture of three inorganic species, being the potassium peroxymonosulfate (KHSO5) the reactive one. Over the past few decades, this cheap and environmentally friendly oxidant has become a powerful tool in organic synthesis, being extensively employed to mediate the construction of a plethora of important compounds. This review summarizes the recent advances in the Oxone-mediated synthesis of N-, O- and chalcogen-containing heterocyclic compounds, through a wide diversity of reactions, starting from several kinds of substrate, highlighting the main synthetic differences, advantages, the scope and limitations. 相似文献
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本文总结了近十年来多核苷酸合成化学的进展,重点论述了核苷和核苷酸的区域选择酰化反应,亲核性催化的保护基和新近发展的核苷酸间键合的形成方法。 相似文献
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Graphene, the thinnest two‐dimensional material in nature, has abundant distinctive properties, such as ultrahigh carrier mobility, superior thermal conductivity, very high surface‐to‐volume ratio, anomalous quantum Hall effect, and so on. Laterally confined, thin, and long strips of graphene, namely, graphene nanoribbons (GNRs), can open the bandgap in the semimetal and give it the potential to replace silicon in future electronics. Great efforts are devoted to achieving high‐quality GNRs with narrow widths and smooth edges. This minireview reports the latest progress in experimental and theoretical studies on GNR synthesis. Different methods of GNR synthesis—unzipping of carbon nanotubes (CNTs), cutting of graphene, and the direct synthesis of GNRs—are discussed, and their advantages and disadvantages are compared in detail. Current challenges and the prospects in this rapidly developing field are also addressed. 相似文献
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Visible-light photoredox catalysis has been established as a popular and powerful tool for organic transformations owing to its inherent characterization of environmental friendliness and sustainability in the past decades. The thiol-ene/yne reactions, the direct hydrothiolation of alkenes/alkynes with thiols, represents one of the most efficient and atom-economic approaches for the carbon-sulfur bonds construction. In traditional methodologies, harsh conditions such as stoichiometric reagents or a specialized UV photo-apparatus were necessary suffering from various disadvantages. In particular, visible-light photoredox catalysis has also been demonstrated to be a greener and milder protocol for the thiol-ene/yne reactions in recent years. Additionally, unprecedented advancements have been achieved in this area during the past decade. In this review, we will summarize the recent advances in visible-light photoredox catalyzed thiol-ene/yne reactions from 2015 to 2021. Synthetic strategies, substrate scope, and proposed reaction pathways are mainly discussed. 相似文献