Serendipitous Synthesis of 5-Hydroxyuridine from 2′,3′-O-Isopropylidene N4-Acetylcytidine by Hypervalent Iodine(III)-Mediated Reaction

Abstract

Whereas BAIB-TEMPO oxidation of 2′,3′-O-TBDMS-N4-acetylcytidine results in the expected 5′-carboxylic acid nucleoside, its 2′,3′-O-isopropylidene analogue reacts in a radically different way. We have demonstrated here that hypervalent iodine(III) in water triggers an unprecedented oxidative cyclization leading to a mixture of C5-substituted O6,5′-cyclo-5,6-dihydrouridines. This mixture of cyclouridines can be opened under basic conditions and, after deprotection, yields 5-hydroxyuridine, an important post-transcriptional modification of uridine at the wobble position (U34) of bacterial tRNA. NMR experimental values and calculations were performed to provide further insight on the specific reactivity of 2′,3′-O-isopropylidene N4-acetylcytidine.

Key words

hypervalent iodine - nucleosides - cyclouridine - oxidative cyclization - 5-hydroxyuridine

Publication History

Received: 15 July 2023

Accepted after revision: 12 September 2023

Accepted Manuscript online:
12 September 2023

Article published online:
18 October 2023

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