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Reagents and conditions: (a) (Boc)2O, DMF, H2O, Et3N, 60°C, 5 h, 60%. (b) TPS-Cl, pyridine, r.t., 40 h, 50%. (c) NaN3, DMF/H2O (10/1), 12 h, 90 °C, 90%. (d) Toluene, CuI, DIPEA, r.t., 90 °C. (e) 4 M HCl/dioxane, r.t., 5 min. Yield for steps d-e=82-90%.
