4.7 Article

Synthesis of 2′-C,4′-C-Methyleneoxy-Bridged Thymidine Derivatives and Properties of Modified Oligonucleotides

Journal

JOURNAL OF ORGANIC CHEMISTRY
Volume 84, Issue 21, Pages 13336-13344

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.9b01496

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Funding

  1. JSPS KAKENHI [JP17K18295]
  2. Uehara Memorial Foundation

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2',4'-Bridged nucleic acid (2',4'-BNA) analogues are used for therapeutic oligonucleotides, owing to their excellent hybridizing ability with complementary RNA and high resistance toward enzymatic degradation. We developed 2',4'-BNA analogues with oxygen atoms at 6'-positions (e.g., EoNA and EoDNAs) and demonstrated that the presence of 6'-oxygen atoms in the bridge structure could show positive effect on the properties of the modified oligonucleotides. Herein, we designed and synthesized 7'-methyl derivatives of methyleneoxy-bridged 2'-deoxyribonucleic acid (MoDNA), possessing a five-membered bridge with 6'-oxygen atom via radical cyclization for the bridge construction. The synthesized monomers were incorporated into the oligonucleotides by solid-phase oligonucleotide synthesis. The MoDNA-modified oligonucleotides showed high affinity toward single-stranded RNA and double-stranded DNA, as well as excellent resistance toward nuclease compared with the corresponding natural oligonucleotide.

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