7-Substituted 8-aza-7-deazaadenosines for modification of the siRNA major groove

José M. Ibarra-Soza, Alexi A. Morris, Prasanna Jayalath, Hayden Peacock, Wayne E. Conrad, Michael B. Donald, Mark J. Kurth, Peter A. Beal

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Here we describe the synthesis of new 7-substituted 8-aza-7-deazaadenosine ribonucleoside phosphoramidites and their use in generating major groove-modified duplex RNAs. A 7-ethynyl analog leads to further structural diversification of the RNA via post-automated RNA synthesis azide-alkyne cycloaddition reactions. In addition, we report preliminary studies on the effects of eight different purine 7-position modifications on RNA duplex stability and pairing specificity. Finally, the effect on RNAi activity of this type of modification at eight different positions in an siRNA guide strand has been explored. Analogs were identified with large 7-position substituents that maintain adenosine pairing specificity and are well-tolerated at specific positions in an siRNA guide strand. This journal is

Original languageEnglish (US)
Pages (from-to)6491-6497
Number of pages7
JournalOrganic and Biomolecular Chemistry
Issue number32
StatePublished - Aug 28 2012

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Biochemistry


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