Abstract
A set of pyrene-modified pyrimidine and purine nucleosides, consisting of 5-(1-pyrenyl)-2′-deoxyuridine
(1 ), 5-(1-pyrenyl)-2′-deoxycytidine (2 ), 8-(1-pyrenyl)-2′-deoxyguanosine (3 ), and 8-(1-pyrenyl)-2′-deoxyadenosine (4 ), was prepared via palladium-catalyzed Suzuki-Miyaura-type cross-coupling reactions.
The syntheses started from 1-pyrenylboronic acid (5 ) and the corresponding halogenated nucleoside precursors. They were performed without
protection of the hydroxy functions of the 2′-deoxyribose moiety and the exocyclic
amino functions of the nucleoside bases. Good yields could be obtained for the preparation
of 1 and 3 , but not in case of 2 and 4 . Obviously, the latter compounds require a protecting group strategy. The absorption
and steady-state fluorescence properties of the pyrene-modified nucleosides 1 -4 were characterized in MeCN and MeOH.
Key words
cross-coupling - electron transfer - nucleosides - palladium - fluorescence
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