共查询到20条相似文献,搜索用时 138 毫秒
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讲述了单糖与苯硼酸间的酯化反应过程及影响因素,举例说明了此类反应在化学和生物学中的应用,拓展了有机化学教学中关于单糖化合物的应用介绍,引导学生提升对化学和生物学交叉领域学习和研究的兴趣。 相似文献
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黄酮类化合物生理活性及合成研究进展 总被引:34,自引:0,他引:34
黄酮类化合物是一类植物次生代谢产物, 广泛存在于多种植物中, 不仅数量种类繁多, 而且结构类型复杂多样. 黄酮类化合物因其独特的化学结构而对哺乳动物和其它类型的细胞具有许多重要的生理、生化作用, 是许多中草药的有效成分. 据报道, 适量摄入黄酮类化合物能减少癌症、肿瘤、心血管疾病、脂质过氧化以及骨质疏松等疾病的发病率. 因此, 其引起了国内外化学家的广泛重视, 近年来研究进展很快. 随着对其构效关系的深入研究, 发现了黄酮类化合物部分药理作用的作用机制, 为其在医药、食品领域的应用提供了理论依据, 加快了黄酮类化合物的开发利用. 迄今为止, 人们已经合成了一系列溶解性好, 具有多种生物活性的黄酮类衍生物. 综述了黄酮类化合物的生理活性及其合成研究进展. 相似文献
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A Pd-catalyzed decarboxylative coupling of substituted benzoic acids with phenylboronic acid has been developed. Under the optimized conditions, a variety of substituted benzoic acids were found to undergo decarboxylative coupling with various phenylboronic acids to give the desired unsymmetrical biaryls in good yields.
[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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Jonathan Martinelli Lorenzo Tei Simonetta Geninatti Crich Diego Alberti Kristina Djanashvili 《Molecules (Basel, Switzerland)》2021,26(6)
It is known that phenylboronic acid (PBA) can target tumor tissues by binding to sialic acid, a substrate overexpressed by cancer cells. This capability has previously been explored in the design of targeting diagnostic probes such as Gd- and 68Ga-DOTA-EN-PBA, two contrast agents for magnetic resonance imaging (MRI) and positron emission tomography (PET), respectively, whose potential has already been demonstrated through in vivo experiments. In addition to its high resolution, the intrinsic low sensitivity of MRI stimulates the search for more effective contrast agents, which, in the case of small-molecular probes, basically narrows down to either increased tumbling time of the entire molecule or elevated local concentration of the paramagnetic ions, both strategies resulting in enhanced relaxivity, and consequently, a higher MRI contrast. The latter strategy can be achieved by the design of multimeric GdIII complexes. Based on the monomeric PBA-containing probes described recently, herein, we report the synthesis and characterization of the dimeric analogues (GdIII-DOTA-EN)2-PBA and (GdIII-DOTA-EN)2F2PBA. The presence of two Gd ions in one molecule clearly contributes to the improved biological performance, as demonstrated by the relaxometric study and cell-binding investigations. 相似文献
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介绍了1,3,5-苯三甲醛的合成与应用。在1,3,5-苯三甲醛的众多合成方法中,以氧化还原方法最常见,此外水解、聚合等方法各具优点,在满足高产率和绿色化学方面有了更多选择。1,3,5-苯三甲醛是一种具有广泛开发应用前景的化学合成中间体,以其为原料合成的大分子物质具有优异的化学、物理特性和生物活性,在催化、光电、抗病毒,以及分子吸附和药物包材等方面具有广泛的应用。 相似文献