Incorporation of hexose nucleoside analogues into oligonucleotides: synthesis, base-pairing properties and enzymatic stability

Abstract
Oligonucleotides containing 1-(2,4-dideoxy-β-D-erythro-hexo-pyranosyl)thymine (2) and 1-{3,4-dideoxy-β-De-erythro-hexopyranosyl) thymine (3) were synthesized on a solid support using the phosphoramldite approach. The properties of these oligonucleotides were compared with the earlier reported characteristics of oligonucleotides containing 1-(2,3-dideoxy-β-De-erythro-hexopyranosyl) thymine (1). The order in enzymatic stability of end-substituted oligonucleotides is 3>1>>2 . The hybridization properties of the modified oligonucleotides are in reverse order: 2>>1>3.