Small molecules enhance functional O-mannosylation of Alpha-dystroglycan
摘要:
Alpha-dystroglycan (alpha-DG), a highly glycosylated receptor for extracellular matrix proteins, plays a critical role in many biological processes. Hypoglycosylation of alpha-DG results in various types of muscular dystrophies and is also highly associated with progression of majority of cancers. Currently, there are no effective treatments for those devastating diseases. Enhancing functional O-mannosyl glycans (FOG) of alpha-DG on the cell surfaces is a potential approach to address this unmet challenge. Based on the hypothesis that the cells can up-regulate FOG of alpha-DG in response to certain chemical stimuli, we developed a cell-based high-throughput screening (HTS) platform for searching chemical enhancers of FOG of alpha-DG from a large chemical library with 364,168 compounds. Sequential validation of the hits from a primary screening campaign and chemical works led to identification of a cluster of compounds that positively modulate FOG of alpha-DG on various cell surfaces including patient-derived myoblasts. These compounds enhance FOG of alpha-DG by almost ten folds, which provide us powerful tools for O-mannosylation studies and potential starting points for the development of drug to treat dystroglycanopathy. (c) 2015 Elsevier Ltd. All rights reserved.
[EN] FUSED HETEROCYCLIC DERIVATIVES AND USE THEREOF<br/>[FR] DÉRIVÉS HÉTÉROCYCLIQUES FUSIONNÉS ET LEUR UTILISATION
申请人:TAKEDA PHARMACEUTICAL
公开号:WO2009136663A1
公开(公告)日:2009-11-12
The present invention provides a fused heterocyclic derivative having a strong kinase inhibitory activity and use thereof. The present invention relates to a compound represented by the formula wherein each symbol is as defined in the present specification, or a salt thereof.
A substituent- and temperature-controllable NHC-derived zwitterionic catalyst enables CO<sub>2</sub> upgrading for high-efficiency construction of formamides and benzimidazoles
作者:Zhaozhuo Yu、Zhengyi Li、Lilong Zhang、Kaixun Zhu、Hongguo Wu、Hu Li、Song Yang
DOI:10.1039/d1gc01897c
日期:——
zwitterionic catalyst for efficient CO2 reductive upgrading via either N-formylation or further coupling with cyclization under mild conditions (25 °C, 1 atm CO2) using hydrosilane as a hydrogen source. More than 30 different alkyl and aromatic amines could be transformed into the corresponding formamides or benzimidazoles with remarkable yields (74%–98%). The electronic effect of the introduced substituent
近年来,将温室气体CO 2化学催化升级为有价值的化学品和生物燃料引起了广泛关注。在已报道的方法中,CO 2与胺的N-甲酰化由于其在构建含N 线性和环状骨架方面的多功能性而具有重要意义。这里,稳定的N-杂环卡宾-羧基加合物(NHC-CO 2)中制备的轻便和可作为用于高效CO可回收两性离子催化剂2还原升级经由任一Ñ -formylation或另外的耦合用温和的条件下环化(25 °C, 1 atm CO 2) 使用氢硅烷作为氢源。超过 30 种不同的烷基和芳香胺可以转化为相应的甲酰胺或苯并咪唑,产率显着(74%–98%)。发现引入的取代基对NHC-CO 2的电子效应明显影响两性离子催化剂的热稳定性和亲核性,这与其催化活性直接相关。此外,NHC-CO 2可以通过在特定温度下原位脱羧来提供CO 2,这取决于引入的取代基类型。实验和计算研究表明,NHC-CO 2上的羧基物质不仅是亲核中心,而且还是在氢化硅烷化过程中快速捕获或替代环境
Ru/ceria-catalyzed direct formylation of amines and CO to produce formamides
作者:Yehong Wang、Jian Zhang、Haijun Chen、Zhixin Zhang、Chaofeng Zhang、Mingrun Li、Feng Wang
DOI:10.1039/c6gc02603f
日期:——
We herein report a new strategy of directly converting amines and CO to formamides with 100% atom utilization efficiency.
我们在此报告了一种将胺和 CO 直接转化为甲酰胺的新策略,其原子利用效率为 100%。
First report on bio-catalytic N-formylation of amines using ethyl formate
作者:Rupesh E. Patre、Sanjib Mal、Pankaj R. Nilkanth、Sujit K. Ghorai、Sudhindra H. Deshpande、Myriem El Qacemi、Tomas Smejkal、Sitaram Pal、Bhanu N. Manjunath
DOI:10.1039/c6cc07679c
日期:——
A Bio-catalyzed N-formylation reaction of different amines has been developed using ethyl formate as formylatingagent. This protocol provides a facile and convenient strategy featuring mild reaction condition, high efficacy,...
We here report a new protocol for the formylation of various amines, primary or secondary, aromatic or alkyl, cyclic or linear, mono- or di-amine, with dimethylformamide (DMF) as the formylation reagent to obtain the corresponding formamides in good to excellent yields over CeO2 catalyst. The reaction requires no homogeneous acidic or basic additives and is tolerant to water.