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Article Abstract
Modification of nucleosides via cross-coupling processes has been carried out extensively on unprotected halonucleosides to produce functionalized nucleosides that are often developed for incorporation into oligonucleotides or used as fluorescent probes. This approach requires protection of the 5'-OH with the 4,4'-dimethoxytrityl (DMTr) group, which is complicated and a common cause of reaction failure. Here we report a method for direct functionalization of 5'-O-DMTr-5-iodo-2'-deoxyuridine via Suzuki-Miyaura cross-coupling, Heck alkenylation, and carboamidation. This approach facilitates rapid synthesis of a variety of C5-substituted 5'-O-DMTr-2'-deoxyuridine derivatives. © 2022 Wiley Periodicals LLC. Basic Protocol 1: Synthesis of the SerrKap palladacycle complex Basic Protocol 2: Suzuki-Miyaura coupling of 5'-O-DMTr-5-iodo-2'-deoxyuridine using SerrKap palladacycle Basic Protocol 3: Heck coupling of 5'-O-DMTr-5-iodo-2'-deoxyuridine using SerrKap palladacycle Basic Protocol 4: Heck coupling of 5'-O-DMTr-5-iodo-2'-deoxyuridine with Ruth linker using Pd(OAc) /PTABS Basic Protocol 5: Carbonylative amidation of 5'-O-DMTr-5-iodo-2'-deoxyuridine using Pd(OAc) /PTABS.
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