Cyclopropanations of Olefin-Containing Natural Products for Simultaneous Arming and Structure Activity Studies
作者:Omar Robles、Sergio O. Serna-Saldívar、Janet A. Gutiérrez-Uribe、Daniel Romo
DOI:10.1021/ol300105q
日期:2012.3.16
ester under Rh(II) catalysis is employed for cyclopropanations of electron-rich olefins while an alkynyl sulfonium ylide is used for electron-poor olefins. This approach enables simultaneous natural product derivatization for SAR studies and arming (i.e., via alkyne attachment) for subsequent conjugation with reporter tags (e.g., biotin, fluorophores, photoaffinity labels) for mechanism of action studies
据报道,在温和条件下进行的含烯烃天然产物的环丙烷化反应可用于同时进行武装和结构-活性关系研究。在 Rh(II) 催化下的炔基重氮酯用于富电子烯烃的环丙烷化,而炔基锍叶立德用于缺电子烯烃。这种方法可以同时进行 SAR 研究的天然产物衍生化和武装(即通过炔烃连接),以便随后与报告标签(例如,生物素、荧光团、光亲和标签)结合,用于作用机制研究,包括细胞目标识别和蛋白质组分析实验。
Plant enzymes for bioconversion
申请人:Bouwmeester Jan Hendrik
公开号:US20050019882A1
公开(公告)日:2005-01-27
The invention provides the use of enzymes derived from plants in biocatalysis. The regio- and stercoselective introduction of an oxygen group into an unactivated organic compound is still a largely unresolved challenge to organic chemistry (Faber, 2000). We have shown that enzymes of Asteraceae species are capable of converting with high regio- and stereospecificity for example sesquiterpene olefins to commercially interesting products.
An unexpected dinitroderivative (2) of sesquiterpene lactone achillin (1), isolated from the aerial part of Achilleu micrantha Wild., was formed when this compound was exposed to gaseous NOClin CHCl 3 . This derivative was transformed into dinitrocarbonic acid (3) in pyridine in 30 minutes and in quantitative yield. The structures of these compounds were unambiguously determined by single-crystal
COMPOSITION FOR PROTECTING LIVER COMPRISING DANDELION EXTRACT AND LEMON BALM EXTRACT
申请人:Phytonutrimedi Co., Ltd.
公开号:EP3653220A2
公开(公告)日:2020-05-20
The present invention can effectively protect a liver from oxidative stress caused by liver damage by significantly reducing the aspartate aminotransferase (AST) and alanine aminotransferase (ALT) values, which are widely known as indicators of liver damage when applied to liver toxicity animal models. The present invention relates to a composition for protecting a liver comprising a dandelion extract and a lemon balm extract as active ingredients that can be usefully used for preventing, ameliorating or treating liver damage, wherein the composition is characterized by comprising a dandelion extract and a lemon balm extract as active ingredients.
A method for reducing motility and number of L. donovani cells, said method comprising contacting the L. donovani cells with an effective amount of a composition, the composition comprising a combination of metronidazole and itraconazole, wherein the effective amount is sufficient to reduce motility of the L. donovani cells.