Palladium-supported graphene oxide has been successfully applied as a catalyst precursor for the selective reduction of α,β-unsaturated carbonyl compounds. Pd nanoparticles were formed during the course of the reduction with only negligible leaching of the Pd species into the reaction mixture.
[EN] FC RECEPTOR MODULATING COMPOUNDS AND COMPOSITIONS<br/>[FR] COMPOSES ET COMPOSITIONS MODULANT LE RECEPTEUR FC
申请人:ARTHRON LTD
公开号:WO2004058747A1
公开(公告)日:2004-07-15
The present invention provides compounds capable of binding to an Fc receptor and modulating Fc receptor activity comprising a core lipophilic group in the form of an Aryl ring substituted with a group rich in p-electrons. The invention further provides for a method of treating an autoimmune disease involving Fc receptor activity using such compounds. A method for obtaining a compound which modulates Fc receptor activity is also provided, the method comprising: (a) providing or designing compounds having structural characteristics to fit in the groove of the FcϜRIIa structure; and (b) screening the compounds for modulating activity on the Fc receptor.
Pyrylium-mediated transformations of natural products. Part 3. Synthesis of water-soluble pyrylium salts and their preparative reactions with amines
作者:Alan R. Katritzky、Yu-Kun Yang、Bjarne Gabrielsen、Jorge Marquet
DOI:10.1039/p29840000857
日期:——
A series of water-soluble pyryliumsalts and zwitterions has been prepared containing two or three carboxylic or sulphonic acid groups. These pyryliumsalts react in aqueous solution with ammonia to give the corresponding pyridines and with n-butylamine, benzylamine, and the ω-amino groups of lysine to give the corresponding pyridinium systems, usually as betaines. The pyridinium betaines (m.p. > 300
已经制备了一系列含有两个或三个羧酸或磺酸基团的水溶性吡啶鎓盐和两性离子。这些吡啶盐在水溶液中与氨反应生成相应的吡啶,并与正丁胺,苄胺和赖氨酸的ω-氨基反应生成相应的吡啶鎓体系,通常作为甜菜碱。吡啶鎓甜菜碱(mp> 300°C)显示出特征性的13 C nmr光谱,几乎已完全归属。
CYCLOADDITION REACTIONS USING QUANTUM DOTS
申请人:Northwestern University
公开号:US20200331836A1
公开(公告)日:2020-10-22
Disclosed herein are methods in which colloidal quantum dots (QDs) can serve as visible-light chromophores, photocatalysts, and reusable scaffolds for homo- and hetero-intermolecular [2+2] photocycloadditions. The methods may lead to >90% tunable regioselectivity and up to 98% diastereoselectivity for previously minor syn-cyclobutane products, including the syn-head-to-tail cyclobutane.
Regio- and diastereoselective intermolecular [2+2] cycloadditions photocatalysed by quantum dots
作者:Yishu Jiang、Chen Wang、Cameron R. Rogers、Mohamad S. Kodaimati、Emily A. Weiss
DOI:10.1038/s41557-019-0344-4
日期:2019.11
Light-driven [2+2] cycloaddition is the most direct strategy to build tetrasubstituted cyclobutanes, core components of many lead compounds for drug development. Significant advances in the chemoselectivity and enantioselectivity of [2+2] photocycloadditions have been made, but exceptional and tunable diastereoselectivity and regioselectivity (head-to-head versus head-to-tail adducts) is required for