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.
advantages of our methodology include an increased synthesis speed, very mild conditions giving access to hitherto unknown or highly reactive classes of isocyanides, rapid access to large numbers of functionalized isocyanides, increased yields, high purity, proven scalability over 5 orders of magnitude, increased safety and less reaction waste resulting in a highly reduced environmental footprint. For example
Regioselective, Solvent-Free
Synthesis of 3-Aminoimidazo[1,2-<i>a</i>]pyrimidines Under
Microwave Irradiation Promoted by Zeolite HY
作者:Beining Chen、Mark Thompson、Jenny Hurst
DOI:10.1055/s-0028-1087274
日期:——
Microwave-assisted, solvent-free condensation of 2-aminopyrimidine with aldehydes and isonitriles gave the desired 3-aminoimidazo[1,2-a]pyrimidine products with good to excellent regioselectivity. A hydrogen zeolite (‘zeolite HY’) was found to be a novel and effective promoter for the reaction, generally leading to clean conversion and also permitting use of the normally unreactive 4,6-dimethyl-2-aminopyrimidine.
The present invention relates to compounds of formula (I), combinations and uses thereof for disease therapy,
or a pharmaceutically acceptable salt, solvate or polymorph thereof, including all tautomers and stereoisomers thereof wherein
R
1
represents heteroaryl; -carbocyclyl-heteroaryl; -alkenylheteroaryl or -alkylheteroaryl;
R
2
represents alkyl which may optionally be substituted by hydroxy; carbocyclyl, which may optionally be substituted by one or more groups selected from alkyl and hydroxy; aryl; -aryl-heteroaryl; -heteroaryl-aryl; -aryl-heterocyclyl; H; heteroaryl; or heterocyclyl, which may optionally be substituted by one or more groups selected from alkyl oxo and hydroxy;
R
3
represents alkyl which may optionally be substituted by one of more groups selected from alkoxy, amine, hydroxy and —C(O)Oalkyl; carbocyclyl, which may optionally be substituted by one or more groups selected from alkyl haloalkyl, alkoxy, amine, hydroxy and —C(O)Oalkyl; -alkyl-aryl; -alkyl(aryl)
2
; -alkyl-heteroaryl; -alkyl(heteroaryl)
2
; -alkyl(heteroaryl)(aryl); -aryl-O-aryl; aryl; heterocyclyl, -alkyl-C(O)-heterocyclyl, -alkyl-heterocyclyl, -alkyl-C(O)—NR
5
-heterocyclyl or -alkyl(heterocyclyl)
2
in any of which groups heterocyclyl may be optionally substituted by one or more groups selected from alkyl hydroxy and oxo; -heteroaryl; or -hydroxyalkylaryl;
R
4
represents H or C
1-3
alkyl;
R
5
represents H or C
1-3
alkyl; and
X represents O or S.
The present invention relates to compounds of formula (I), combinations and uses thereof for disease therapy,
or a pharmaceutically acceptable salt, solvate or polymorph thereof, including all tautomers and stereoisomers thereof wherein
R1 represents heteroaryl; -carbocyclyl-heteroaryl; -alkenylheteroaryl or -alkylheteroaryl;
R2 represents alkyl which may optionally be substituted by hydroxy; carbocyclyl, which may optionally be substituted by one or more groups selected from alkyl and hydroxy; aryl; -aryl-heteroaryl; -heteroaryl-aryl; -aryl-heterocyclyl; H; heteroaryl; or heterocyclyl, which may optionally be substituted by one or more groups selected from alkyl oxo and hydroxy;
R3 represents alkyl which may optionally be substituted by one of more groups selected from alkoxy, amine, hydroxy and —C(O)Oalkyl; carbocyclyl, which may optionally be substituted by one or more groups selected from alkyl haloalkyl, alkoxy, amine, hydroxy and —C(O)Oalkyl; -alkyl-aryl; -alkyl(aryl)2; -alkyl-heteroaryl; -alkyl(heteroaryl)2; -alkyl(heteroaryl)(aryl); -aryl-O-aryl; aryl; heterocyclyl, -alkyl-C(O)-heterocyclyl, -alkyl-heterocyclyl, -alkyl-C(O)—NR5-heterocyclyl or -alkyl(heterocyclyl)2 in any of which groups heterocyclyl may be optionally substituted by one or more groups selected from alkyl hydroxy and oxo; -heteroaryl; or -hydroxyalkylaryl;
R4 represents H or C1-3 alkyl;
R5 represents H or C1-3 alkyl; and
X represents O or S.
Ugi Reactions with Ammonia Offer Rapid Access to a Wide Range of 5-Aminothiazole and Oxazole Derivatives
作者:Mark J. Thompson、Beining Chen
DOI:10.1021/jo9014529
日期:2009.9.18
A series of Ugi reactions has been successfully performed using ammonia as the amine component, employing 2,2,2-trifluoroethanol its a non-nucleophilic solvent in order to suppress known side reactions. Utilizing concentrated aqueous ammonia its it convenient Source, this approach offered a simple, one-step assembly of Ugi adducts suitable for elaboration into it variety of 5-aminoazole compounds through postcondensation modifications. Free or N-substituted 5-aminothiazoles and 5-(trifluoroacetamido)oxazoles were all prepared by this improved methodology. The scope of the synthetic route developed and application of the different products are discussed.