Palladium-mediated synthesis of C-5 pyrimidine nucleoside thioethers from disulfides and mercurinucleosides

Donald E. Bergstrom, Peter Beal, Jeffrey Jenson, Xiaoping Lin

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28 Scopus citations


Thioether-linked side chains can be created at C-5 of pyrimidine nucleosides via a palladium-mediated reaction of mercurated nucleosides with organic disulfides. 5-(Chloromercuri)-2′-deoxyuridine reacts with butyl disulfide, phenyl disulfide, dimethyl 3,3′-dithiodipropionate, and N,N′-bis(trifluoroacetyl)cystamine to yield respectively 5-(1-thiapentyl)-2′-deoxyuridine, 5-(phenylthio)-2′-deoxyuridine, 5-[3-(methoxycarbonyl)-1-thiapropyl]-2′-deoxyuridine, and 5-[3-(trifluoroacetamido)-1-thiapropyl]-2′-deoxyuridine in yields ranging from 46 to 73%. Other mercurated nucleosides, including 5-(chloromercuri)-2′-deoxycytidine, 5-(chloromercuri)cytidine, and 5-(chloromercuri)tubercidin react with N,N′-bis(trifluoroacetyl)cystamine and lithium-palladium chloride in methanol to yield the corresponding coupled products, but the yields are much lower (5-10%). The nucleoside coupling reaction is complicated by competing side reactions between disulfides and Pd2+, which remain to be elucidated.

Original languageEnglish (US)
Pages (from-to)5598-5602
Number of pages5
JournalJournal of Organic Chemistry
Issue number19
StatePublished - 1991
Externally publishedYes

ASJC Scopus subject areas

  • Organic Chemistry


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