Palladium-Catalyzed Direct <i>N</i>-Arylation of Nucleosides, Nucleotides, and Oligonucleotides for Efficient Preparation of dG−<i>N</i><sup>2</sup> Adducts with Carcinogenic Amino-/Nitroarenes
A method for direct palladium-catalyzed N-arylation reaction of nucleobases was developed for the convenient synthesis of DNA adducts with carcinogenic compounds. Using xantphos as the phosphine ligand and tetraethylammonium fluoride as the base in DMSO, several o-iodonitroarenes could be efficiently coupled with 2‘-deoxyguanosine, 2‘-deoxyadenosine, and 2‘-deoxycytidine. The presence of a 3‘-phosphate