A convenient and biogenetic type synthesis of few naturally occurring chromeno dihydrochalcones and their in vitro antileishmanial activity
摘要:
2',2'-Dimethyl chromeno dihydrochalcones are very rare in nature as plant secondary metabolites. Recently we have reported three such compounds from the plant Crotalaria ramosissima. Chromeno dihydrochalcones contain a 2',2'-dimethyl benzopyran system, which are frequently encountered in many natural products and exhibit a variety of biological activities. We here report the strategy to conveniently synthesize naturally occurring chromeno dihydrochalcones by biogenetic type pyridine or Amberlyst-15 catalyzed chromenylation of dihydrochalcones and in vitro antileishmanial activity of chromeno dihydrochalcones and their intermediates. (C) 2004 Elsevier Ltd. All rights reserved.
黑色素沉积过多可能会导致一系列的皮肤病。黑色素的产生是由黑色素细胞进行的,其中酪氨酸酶起着关键作用。在这项工作中,我们鉴定了一系列具有二氢查耳酮骨架和间苯二酚结构的新型酪氨酸酶抑制剂杂化物,它们可以抑制酪氨酸酶活性并减少皮肤中的黑色素含量。化合物11c具有最强的抗酪氨酸酶活性,在纳摩尔浓度范围内显示出 IC 50值,同时具有显着的抗氧化活性和低细胞毒性。此外,在 HPLC 分析和 3D OrbiSIMS 成像可视化支持下的体外渗透测试表明11c具有出色的渗透性. 更重要的是,化合物11c在体内的豚鼠模型中减少了紫外线诱导的皮肤色素沉着中的黑色素含量。这些结果表明,化合物11c可以作为一种很有前途的强效酪氨酸酶抑制剂,用于开发治疗皮肤色素沉着过度的潜在疗法。
Anti-ulcer agent comprising chalcone derivative as effective ingredient
申请人:Tsumura & Co.
公开号:US05106871A1
公开(公告)日:1992-04-21
The present invention relates to an anti-ulcer agent comprising a compound represented by the following general formula I as the effective ingredient, and a novel chalcone derivative included in the compound represented by this general formula I: ##STR1## wherein X and Y independently stand for a hydrogen atom or together form a single bond, R.sub.1 stands for a hydroxyl group, an acetoxy group, a carboxymethoxy group or a methoxycarbonylmethoxy group, R.sub.2 stands for a hydrogen atom, an isoprenyl group, isopentyl group or a propyl group, R.sub.3 stands for hydroxyl group or a methoxy group, R.sub.4 stands for a hydrogen atom, a hydroxyl group or a methoxy group, R.sub.5 stands for a hydrogen atom, a hydroxyl group, a methoxy group or an isopentyl group, R.sub.6 stands for a hydroxyl group, a methoxy group or a carboxymethoxy group, and R.sub.7 stands for a hydrogen atom or a methoxy group.
licorice, is the most promising antimalarial compound reported so far. In continuation of our drug discovery program, we isolated two similar chalcones, medicagenin (II) and munchiwarin (III), from Crotalaria medicagenia, which exhibited antimalarial activity against Plasmodium falciparum. A library of 88 chalcones were synthesized and evaluated for their in vitro antimalarial activity. Among these, 67,
A concise synthesis of polyhydroxydihydrochalcones and homoisoflavonoids
作者:Vidavalur Siddaiah、Chunduri Venkata Rao、Somepalli Venkateswarlu、Gottumukkala V. Subbaraju
DOI:10.1016/j.tet.2005.10.059
日期:2006.1
phloretin and 5,7-dihydroxy-3-[(4-hydroxyphenyl)methyl]-4H-chromen-4-one. The antioxidant activity of dihydrochalcones and homoisoflavonoids was determined by superoxide free radical (NBT) and DPPH free radical scavenging methods. Polyhydroxydihydrochalcones 3c, 3f, 3g and homoisoflavonoids 4c, 4f, 4g displayed excellent antioxidant activity.
The present invention relates to an anti-ulcer agent comprising a compound represented by the following general formula I as the effective ingredient, and a novel chalcone derivative included in the compound represented by this general formula I: ##STR1## wherein X and Y independently stand for a hydrogen atom or together form a single bond, R.sub.1 stands for a hydroxyl group, an acetoxy group, a carboxymethoxy group or a methoxycarbonylmethoxy group, R.sub.2 stands for a hydrogen atom, an isoprenyl group, isopentyl group or a propyl group, R.sub.3 stands for a hydroxyl group or a methoxy group, R.sub.4 stands for a hydrogen atom, a hydroxyl group or a methoxy group, R.sub.5 stands for a hydrogen atom, a hydroxyl group, a methoxy group or an isopentyl group, R.sub.6 stands for a hydroxyl group, a methoxy group or a carboxymethoxy group, and R.sub.7 stands for a hydrogen atom or a methoxy group.
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.