Impact of Thymidine Loop Modifications on Telomeric G-Quadruplex Catalytic Systems for Asymmetric Sulfoxidation.

ABSTRACT: G-quadruplex (G4) DNA structures have recently emerged as promising chiral scaffolds for enantioselective catalysis. This study investigates how thymidine loop modifications influence the catalytic performance of the telomeric G4 sequence HT21 in the asymmetric sulfoxidation of thioanisole. To this end, several singly or doubly modified HT21 derivatives were synthesized by using β-L-2'-deoxythymidine, 5-hydroxymethyl-2'-deoxyuridine, and 5-bromo-2'-deoxyuridine instead of a T residue, or β-L-2'-deoxyadonesine instead of an A residue, in specific positions within the TTA loops. The catalytic activity of these analogues was evaluated in the Cu(II)-mediated oxidation of thioanisole using hydrogen peroxide as oxidant. All modified sequences maintained complete substrate conversion, but their e

SUBMITTER: Finamore C 

PROVIDER: S-EPMC12898609 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature