A solution of 8-Bromoadenosine (0.5 g, 1.5 mmol) and hexamethyldisilazane (5 mL) in 1,4-dioxane (10 mL) was heated overnight at 80° C. The reaction was cooled to room temperature, concentrated in vacuo, and azeotroped with toluene. The residue was taken up in NMP (3 mL) and tetraethyltin (0.59 mL, 3.0 mmol) and Pd(PPh3)4 (0.175 g, 0.15 mmol) were added. The reaction was allowed to stir at 130° C. for 16 h before cooling to room temperature. The reaction mixture was partitioned between H2O and EtOAc. The aqueous layer was extracted with EtOAc (2×20 mL). The combined organic layers were washed with brine, dried over MgSO4, and concentrated in vacuo. The residue was taken up in MeOH:H2O (4:1) (25 mL) and ammonium chloride was added (400 mg). The reaction was heated at 65° C. for 3 h. When judged complete by TLC, the reaction was concentrated in vacuo and was subjected to silica gel column chromatography running 0-25% MeOH:DCM with 0.1% NH4OH to afford 8-ethyl adenosine.
