Convergent synthesis of fluorescein-labelled lysine-based cluster glycosides
摘要:
The synthesis of fluorescein-labelled lysinyl trees, containing 2, 4 or 8 manno- or galactoside residues, is reported. These lysine-based cluster glycosides have been readily assembled by coupling amino-functionalized, N-chloroacetylated-L-lysinyl trees with fluorescein-isothiocyanate (FITC) and performing a thioether chemoselective ligation with fully deprotected glycoside derivatives. The reaction order is governed by the size of the lysinyl trees; the labelling/thioetherification steps can be performed in an one pot procedure, thus allowing an easy access to glycodendrimers designed to study the dendritic cells' mannose receptor. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
A Bifunctional Spin Label for Ligand Recognition on Surfaces
作者:Michael A. Hollas、Simon J. Webb、Sabine L. Flitsch、Alistair J. Fielding
DOI:10.1002/anie.201703929
日期:2017.8.1
paramagnetic resonance (EPR) of biomolecules spin-labeled with nitroxides can offer uniquely sensitive and selective insights into these processes, but new spin-labeling strategies are needed. The synthesis and study of a bromoacrylaldehyde spin label (BASL), which features two attachment points with orthogonal reactivity is reported. The firstexamples of mannose and biotin ligands coupled to aqueous carboxy-functionalized
histocompatibility class II antigens have been bound to clustered glycosides for selective targeting of the dendritic cell mannose receptor. Di-, tetra-, and octavalent glycoside-antigen conjugates have been obtained after two, orthogonal, hydrazone/thioether ligations, performed by using thio derivatives of D-mannose, D-galactose, or D(-)-quinic acid, glyoxylyl (or hydrazino)-N-chloroacetylated lysinyl
Synthesis of Carbohydrate-Functionalised Sequence-Defined Oligo(amidoamine)s by Photochemical ThiolEne Coupling in a Continuous Flow Reactor
作者:Felix Wojcik、Alexander G. O'Brien、Sebastian Götze、Peter H. Seeberger、Laura Hartmann
DOI:10.1002/chem.201203927
日期:2013.2.25
we report two complimentary strategies for the preparation of such sequence‐defined carbohydrate‐functionalised PAAs that use photochemical thiolene coupling (TEC) as an alternative to the established azide–alkyne cycloaddition (“click”) reaction. In the first approach, PAAs that contained multiple olefins were synthesised on a solid support from a new building block and subsequent conjugation with
Thioctic acid amides: convenient tethers for achieving low nonspecific protein binding to carbohydrates presented on gold surfaces
作者:Rositsa Karamanska、Balaram Mukhopadhyay、David A. Russell、Robert A. Field
DOI:10.1039/b503843j
日期:——
The thioctic acid amides of 2′-aminoethyl α-D-mannopyranoside and 2′-aminoethyl α-1,3-D-mannopyranosyl (α-1,6-D-mannopyranosyl)-α-D-mannopyranoside presented on both planar and nanoparticle gold surfaces give higher specific and lower non-specific protein binding than the related 2′-thioethyl glycosides.
We report a remarkably facile one-pot sonochemical approach to prepare protein microspheres whose shells are covalently decorated with a mannosyl derivative to target Escherichia coli (E. coli), while their cores are encapsulated with tetracycline. Conjugated microspheres induced the agglutination of E. coli and increased the anti-bacterial activity of the encapsulated tetracycline by five fold.