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(a) NaN3, KOH, H2O, reflux, overnight, (b) R-Br, acetonitrile, reflux, overnight, (c) propargyl bromide, NaH, tetrahydrofuran (THF), N2, 60 °C, 5 h, (d) CuSO4, Cu, MeOH/H2O, room temperature, overnight, (e) anion-exchange resin (Amberlite R IRA-900, Cl–) tert-butyl hypochlorite, acetone/H2O, 0 °C, 1 h. Ra: Alkyl substitution on the compounds bearing the letter “a” in the name and Rb: alkyl substitution on the compounds bearing the letter “b” in the name.
