Molybdenum Catalyzed β-Selective Epoxidation of Cholesterol Esters with Molecular Oxygen+
摘要:
Molybdenyl(VI) acetylacetonate catalyses the conversion of various cholesterol esters into the corresponding beta-epoxides in good yields with the combined use of molecular oxygen and i-butyraldehyde at room temperature.
胆固醇酯是由胆固醇与含有长烃链的脂肪酸结合形成的非极性化合物。这些酯分子不参与细胞膜的组成,存在于脂滴中。由于这种形式的胆固醇可以大量包裹在脂蛋白中,因此胆固醇的运输更有效,而且这些酯类在胆固醇代谢中起着重要作用。此外,它们的一些氢过氧化物衍生物是最小修饰低密度脂蛋白 (mmLDL) 的生物活性成分。近年来,这些酯在许多工业和医疗应用中引起了人们的关注。在这项研究中,三苯基膦-三氧化硫加合物在甲苯中有效催化同源长链饱和单羧酸或二羧酸脂肪酸与胆固醇分子的酯化反应。在这些反应中,基于三苯基膦的加合物充当三氧化硫的来源。除二羧酸外,反应在 110 °C 下用等摩尔量的试剂进行,使用两个等摩尔的胆固醇以良好至优异的产率提供相应的同源胆固醇酯。目前开发的方法具有比现有方法更简单、实用、毒性更小的优点,并且能够以更高的收率合成相关酯。基于三苯膦的加合物充当三氧化硫的来源。除二羧酸外,反应在 110 °C
[EN] RAS BINDING PEPTIDES AND METHODS OF USE<br/>[FR] PEPTIDES DE LIAISON À RAS ET MÉTHODES D'UTILISATION
申请人:RA PHARMACEUTICALS INC
公开号:WO2017181061A1
公开(公告)日:2017-10-19
The present invention provides Ras modulators including inhibitors and/or antagonists of Ras, Ras binding, and Ras-dependent cell signaling activity. Also provided are methods of utilizing the Ras modulators as therapeutics.
IONIZABLE COMPOUNDS AND COMPOSITIONS AND USES THEREOF
申请人:Nitto Denko Corporation
公开号:US20160376229A1
公开(公告)日:2016-12-29
This invention includes ionizable compounds, and compositions and methods of use thereof. The ionizable compounds can be used for making nanoparticle compositions for use in biopharmaceuticals and therapeutics. More particularly, this invention relates to compounds, compositions and methods for providing nanoparticles to encapsulate active agents, such as nucleic acid agents, and to deliver and distribute the active agents to cells, tissues, organs, and subjects.
Described herein are nanoparticles that are coated with a bilayer of molecules formed from surface binding molecules and amphiphatic molecules. The bilayer coating self assembles on the nanoparticles from readily available materials/molecules. The modular design of the bilayer coated nanoparticles provides a means for readily and efficiently optimizing the properties of the bilayer coated nanoparticle compositions. Also described herein are uses of such nanoparticles in medicine, laboratory techniques, industrial and commerical applications.
Alpha-Isomaltosylglucosaccharide synthase, process for producing the same and use thereof
申请人:——
公开号:US20030194762A1
公开(公告)日:2003-10-16
The object of the present invention is to provide an &agr;-isomaltosylglucosaccharide-forming enzyme, process of the same, cyclotetrasaccharide, and saccharide composition comprising the saccharide which are obtainable by using the enzyme; and is solved by establishing an &agr;-isomaltosylglucosaccharide-forming enzyme which forms a saccharide, having a glucose polymerization degree of at least three and having both the &agr;-1,6 glucosidic linkage as a linkage at the non-reducing end and the &agr;-1,4 glucosidic linkage other than the linkage at the non-reducing end, by catalyzing the &agr;-glucosyl-transfer from a saccharide having a glucose polymerization degree of at least two and having the &agr;-1,4 glucosidic linkage as a linkage at the non-reducing end without substantially increasing the reducing power; &agr;-isomaltosyl-transferring method using the enzyme; method for forming &agr;-isomaltosylglucosaccharide; process for producing a cyclotetrasaccharide having the structure of cyclo{→6)-&agr;-D-glucopyranosyl-(1→3)-&agr;-D-glucopyranosyl-(1→6)-&agr;-D-glucopyranosyl-(1→3)-&agr;-D-glucopyranosyl-(1→} using both the &agr;-isomaltosylglucosaccharide-forming enzyme and the &agr;-isomaltosyl-transferring enzyme; and the uses of the saccharides obtainable therewith.