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A new bromohexyl phosphoramidite was synthesized and used for the introduction of an azide function at the 5′-end of oligonucleotides after a treatment on solid support with sodium azide and sodium iodide. The corresponding 5′-azido oligonucleotide could be further used for ‘Click’ conjugation with alkyne derivatives or by Staudinger ligation.
We report the synthesis of a new phosphorylating reagent that is easily accessible and allows not only the chemical synthesis of 5′-phosphorylated and 5′-thiophosphorylated oligonucleotides but also the 5′-conjugation through a phosphoramidate linkage. 5′-Amino-linker and 5′-alkyne oligonucleotides were obtained and the latter was conjugated by a 1,3-dipolar cycloaddition (click chemistry) with a...
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