Chemical Synthesis of 2‘-Deoxyguanosine−C8 Adducts with Heterocyclic Amines: An Application to Synthesis of Oligonucleotides Site-Specifically Adducted with 2-Amino-1-methyl-6-phenylimidazo[4,5-<i>b</i>]pyridine
Synthesis of 2'-deoxyguanosine-C8 adducts (dG-C8 adducts) with mutagenic/carcinogenic heterocyclic amines (HCAs) was achieved via the Buchwald-Hartwig arylamination reaction. By using tris(dibenzylideneacetone)dipalladium (Pd(2)dba(3)) and 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene (xantphos) with a cesium carbonate (Cs(2)CO(3)) base at a reaction temperature of 100 approximately 120 degrees C