Scheme 2.

^a Synthesis of 1,2,3-triazoles 17 and 18

^a Reagents and conditions: a) KI, acetone/CH₃CN, rt–50 °C, 12 h, 72%; b) NaN₃, acetone/H₂O, 0 °C–rt, 14 h, 94%; c) NaH, THF/benzene, then 13, 0 °C–rt, 12h, 65%; d) K₂CO₃, MeOH, rt, 12 h, 45–90%; e) sodium ascorbate, CuSO₄·5H₂O, THF/H₂O (3:1), rt, 12 h, 54–96%; f) Cp*RuCl(PPh₃)₂, THF, 60 °C, 1–2 d, 24–48%.