Synthesis of Poly(ADP-ribose) Monomer Containing 2′-O-α-D-Ribofuranosyl Adenosine

In this article, the earlier reported procedure for the synthesis of 2′-O-β-D-ribofuranosyl nucleosides was extended to the synthesis of 2′-O-α-D-ribofuranosyl adenosine, a monomeric unit of poly(ADP-ribose). It consists in condensation of a small excess of 1-O-acetyl-2,3,5-tri-O-benzoyl-α,β-D-arabinofuranose activated with tin tetrachloride with 3′,5′-O-tetra-isopropyldisiloxane-1,3-diyl-ribonucleosides in 1,2-dichloroethane. The following debenzoylation and silylation of arabinofuranosyl residue and inversion of configuration at C-2ʹʹ atom of arabinofuranosyl residue and final removal of silyl protective groups gave 2′-O-α-D-ribofuranosyl adenosine in overall 13% to 21% yield. © 2019 by John Wiley & Sons, Inc.