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Reagents and conditions: i, THF, NaH, Propargyl Bromide, 50 °C, 24 h; ii, MeOH, H2SO4, reflux; iii, CHCl3, K2CO3, 0–5 °C, BrCH2COBr, 2 h; iv, DMF, NaN3, 50 °C, 12 h; v, CuSO4∙5H2O, Sodium ascorbate, t-BuOH–H2O (10:1), 80 °C, 72 h; vi, CHCl3, MeI, 72 h; vii, MeOH, NH4PF6.
