4.7 Article

Ethynyl Side Chain Hydration during Synthesis and Workup of Clickable Oligonucleotides: Bypassing Acetyl Group Formation by Triisopropylsilyl Protection

Journal

JOURNAL OF ORGANIC CHEMISTRY
Volume 78, Issue 22, Pages 11271-11282

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/jo401780u

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Funding

  1. ChemBiotech, Munster, Germany

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Clickable oligonucleotides with ethynyl residues in the 5-position of pyrimidines ((eth)dC and (eth)dU) or the 7-position of 7-deazaguanine ((eth)c(7)G(d)) are hydrated during solid-phase oligonucleotide synthesis and workup conditions. The side products were identified as acetyl derivatives by MALDI-TOF mass spectra of oligonucleotides and by detection of modified nucleosides after enzymatic phosphodiester hydrolysis. Ethynyl -> acetyl group conversion was also studied on ethynylated nucleosides under acidic and basic conditions. It could be shown that side chain conversion depends on the nucleobase structure. Triisopropylsilyl residues were introduced to protect ethynyl residues from hydration. Pure, acetyl group free oligonucleotides were isolated after desilylation in all cases.

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