Dihydrochalcones: Evaluation as Novel Radical Scavenging Antioxidants
摘要:
Dihydrochalcones are a family of bicyclic flavonoids, defined by the presence of two benzene rings joined by a saturated three carbon bridge. In the present study, we systematically examined the antioxidant activities of dihydrochalcones against the stable free radical (1,1-diphenyl-2-picrylhydrazyl) and lipid peroxidation in the erythrocyte membrane. All dihydrochalcones exhibited higher antioxidant activities than the corresponding flavanones. The H-1 NMR analysis indicated that the active dihydrochalcone has a time-averaged conformation in which the aromatic A ring is orthogonal to the carbonyl group, while the inactive dihydrochalcone such as 2'-O-methyl-phloretin has a strongly hydrogen-bonded phenolic hydroxyl group, suggestive of a coplanar conformation. A hydroxyl group at the 2'-position of the dihydrochalcone A ring, newly formed by reduction of the flavanone C ring, is an essential pharmacophore for its radical scavenging potential.
Abstract In addition to coumarinolignans (cleomiscosin A aquillochin) and 7,4′-dihydroxy-5-methoxyflavanone, a new dihydrochalcone, 2′,4,4′-trihydroxy-6′-methoxydihydrochalcone, was isolated from the seeds of Coptis japonica var. dissecta. The structure of the dihydrochalcone was confirmed by comparison with relevant synthetic samples.
摘要 除了香豆素木脂素(cleomiscosin A aquillochin)和7,4'-二羟基-5-甲氧基黄烷酮外,从黄连变种的种子中分离出一种新的二氢查耳酮,2',4,4'-三羟基-6'-甲氧基二氢查耳酮。 . 解剖。通过与相关合成样品的比较,证实了二氢查尔酮的结构。
Method for Biotechnological Production of Dihydrochalcones
申请人:Symrise AG
公开号:US20140045233A1
公开(公告)日:2014-02-13
A method for production of a dihydrochalcone, especially of phloretin, using a transgenic microorganism, containing a nucleic acid section (a), comprising or consisting of a gene coding for a bacterial chalcone isomerase, and/or a nucleic acid section (a′), comprising or consisting of a gene coding for a plant chalcone isomerase, and a nucleic acid section (b), comprising or consisting of a gene coding for a bacterial enoate reductase, corresponding transgenic microorganisms, containing a nucleic acid section (a), comprising or consisting of a gene coding for a bacterial chalcone isomerase, and/or a nucleic acid section (a′), comprising or consisting of a gene coding for a plant chalcone isomerase, and/or a nucleic acid section (b), comprising or consisting of a gene coding for a bacterial enoate reductase, and host cells, containing one or more identical or different such vectors.
Synthesis of Asebogenin and Balsacone A Precursor by a Novel Synthetic Strategy: Recent Opportunities for and Challenges of Total Synthesis of Balsacone A
作者:M. Fatih Polat
DOI:10.3390/molecules27113523
日期:——
are compounds that exhibit a wide variety of important biological activities. In this respect, it has become very important to develop new strategies for the construction of biologically active natural and synthetic balsacone analogues. In particular, balsacone derivatives with hydroxy-substituted dihydrochalcone skeletons can be isolated from plant sources or obtained by hemi-syntheses using bio-sourced
合成有机化学的主要兴趣领域之一是快速构建具有多种生物活性的小分子,以开发治疗人类健康的新策略。特别是,开发新的合成策略是获得天然来源的活性分子的分子支架的最重要选择。Balsacone A 和 asebogenin 是具有多种重要生物活性的化合物。在这方面,为构建具有生物活性的天然和合成巴尔松酮类似物制定新策略变得非常重要。特别地,具有羟基取代的二氢查耳酮骨架的巴尔松酮衍生物可以从植物来源中分离或通过使用生物来源的前体的半合成获得。一种有效的合成策略来合成获得 balsacone A 是本研究的目的,该研究考虑了这些分子的有限天然可用性以及其他因素,例如成本和时间。从间苯三酚开始,以 10% 的总收率实现了 balsacone A 前体的九步合成。此外,以良好的收率合成了具有二氢查耳酮结构并在合成balsacone A中起关键作用的asebogenin。
Verfahren zur biotechnologischen Herstellung von Dihydrochalkonen
申请人:Symrise AG
公开号:EP2692729A1
公开(公告)日:2014-02-05
Beschrieben werden ein Verfahren zur Herstellung eines Dihydrochalkons, insbesondere von Phloretin, unter Verwendung eines transgenen Mikroorganismus, enthaltend einen Nukleinsäure-Abschnitt (a), umfassend oder bestehend aus einem für eine bakterielle Chalconisomerase kodierenden Gen, und/oder einen Nukleinsäure-Abschnitt (a'), umfassend oder bestehend aus einem für eine pflanzliche Chalconisomerase kodierenden Gen, sowie einen Nukleinsäure-Abschnitt (b), umfassend oder bestehend aus einem für eine bakterielle Enoat-Reduktase kodierenden Gen, entsprechende transgene Mikroorganismen, enthaltend einen Nukleinsäure-Abschnitt (a), umfassend oder bestehend aus einem für eine bakterielle Chalconisomerase kodierenden Gen, und/oder einen Nukleinsäure-Abschnitt (a'), umfassend oder bestehend aus einem für eine pflanzliche Chalconisomerase kodierenden Gen, und/oder einen Nukleinsäure-Abschnitt (b), umfassend oder bestehend aus einem für eine bakterielle Enoat-Reduktase kodierenden Gen, sowie Wirtszellen, die ein oder mehrere identische oder unterschiedliche solche Vektoren enthalten.
Antileishmanial activities of dihydrochalcones from piper elongatum and synthetic related compounds. Structural requirements for activity
作者:Alicia Hermoso、Ignacio A Jiménez、Zulma A Mamani、Isabel L Bazzocchi、José E Piñero、Angel G Ravelo、Basilio Valladares
DOI:10.1016/s0968-0896(03)00406-1
日期:2003.9
Two dihydrochalcones (1 and 2) were isolated from Piper elongatum Vahl by activity-guided fractionation against extracellular promastigotes of Leishmania braziliensis in vitro. Their structures were elucidated by spectral analysis, including homonuclear and heteronuclear correlation NMR experiments. Derivatives 3-7 and 20 synthetic related compounds (8-27) were also assayed to establish the structural requirements for antileishmanial activity. Compounds 1-11 that proved to be more active that ketoconazol, used as positive control, were further assayed against promastigotes of Leishmania tropica and Leishmania infantum. Compounds 7 and 11, with a C-6-C-3-C-6 System, proved to be the most promising compounds, with IC50 values of 2.98 and 3.65 mug/mL, respectively, and exhibited no toxic effect on macrophages (around 90% viability). Correlation between the molecular structures and antileishmanial activity is discussed in detail. (C) 2003 Elsevier Ltd. All rights reserved.