The common route to link quinolinium and pyridinium fluorophores to biomolecules via bromoacetic acid has failed in labeling the disaccharide trehalose with N-methyl-6-oxyquinolinium betaine: the unexpected, extremely high instability of the N-carboxymethyl ester was overcome by direct N-alkylation of the quinoline derivative with trehalose triflate.
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| http://dx.doi.org/10.1016/j.carres.2011.10.022 | DOI Listing |
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