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Reagents and conditions: (a) concentrated HCl, NaNO2, H2O, 0 °C, 15 min; (b) NaN3, H2O, room temperature, 2 h; (c) MeONa, MeOH, 60 °C, overnight; (d) MeOH, H2SO4, reflux, overnight; (e) methylmagnesium bromide, THF, −78 °C to room temperature, 2 h; (f) BiBr3, MeOH or n-BuOH, CCl4, room temperature, 3 h.
