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(i) Et2CO, n-BuOH, AcOH, reflux, 2 h; (ii) N2H4, NaOH, ethylene glycol, reflux, 24 h; (iii) AcCl, NaHCO3, tetrahydrofuran (THF), H2O, room temperature (rt); (iv) Ac2O, rt, 8 h; (v) HCl, H2O, reflux; (vi) NaBH4, EtOH, rt, 2 h; (vii) HalCH(R)CO2H, NaOH, rt, 3 h; (viii) BaCl2, H2O, reflux; (ix) 2.3 M H2SO4, reflux.
