Fig. 1: Background for reaction development.

a Representative examples of bioactive C-8 alkylated nucleosides. b Selected examples of C8 alkylation of purine. c Selected examples of late-stage functionalization of purine of DNA/RNA. d Our strategy for late-stage functionalization of C-8 alkylated nucleosides, nucleotides, and RNA & DNA oligonucleotides. Me methyl, Et ethyl, tBu tert-butyl, Ac Acetyl, HMDS hexamethyldisilazane, CSA camphorsulfonic acid, DLP dilauroyl peroxide.