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Synthesis of α-carboxy nucleoside phosphonate 6f with a 1,2,3-triazole heterocycle as linker moiety [(i) a. Rh2(OAc)4 Benzene, reflux; b. NaN3 acetone/H2O 60 °C, 12 h (ii) CuSO4.5H2O, Sodium ascorbate, Dioxane/H2O, rt, 16 h, 89% (iii) a. TMSBr, CH3CN, 0 °C-rt, 16 h, H2O, 1h; b. aq. NaOH, 50 °C, 12 h, charcoal column]
