Synthesis of N2-substituted deoxyguanosine nucleosides from 2-fluoro-6-O-(trimethylsilylethyl)-2'-deoxyinosine

Syntheses of N2-substituted nucleosides have been studied for many years, primarily with ribonucleosides. However, the primary route to these compounds requires acidic conditions that are too vigorous for the acid-labile deoxyribonucleosides. The current strategy takes advantage of methods for low-temperature, nonaqueous diazotization of ribosides in organic solvents using t-butyl nitrate as the diazotizing agent and HF/pyridine as the fluoride source for the preparation of a 2-fluoro-2-deoxyinosine derivative that can be used to synthesize N2-substituted deoxyguanosine.