Synthesis of Oligodeoxynucleotides Containing a C8-2′-Deoxyguanosine Adduct Formed by the Carcinogen 3-Nitrobenzanthrone

This unit describes the detailed procedure in five parts for the synthesis of the C8-2′-deoxyguanosine-3-aminobenzanthrone adduct located in a desired site in an oligonucleotide. The synthesis of the protected 2′-deoxyguanosine, O ⁶-benzyl-N ²-DMTr-3′-5′-bisTBDMS-C8-Br-2′-deoxyguanosine, is described in the first part. The synthesis of the reduced carcinogen 3-aminobenzanthrone is detailed in part two. The third part outlines the key step of the adduct formation between the reduced carcinogen and the protected nucleoside by a palladium-catalyzed cross coupling reaction. The final two parts describe phosphoramidite synthesis from the nucleoside-carcinogen adduct followed by its site-specific incorporation into DNA by solid-phase oligonucleotide synthesis. The adducted oligonucleotides are purified by reversed-phase HPLC and characterized by mass spectrometry. © 2017 by John Wiley & Sons, Inc.