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Reagents and conditions: (a) KI, K2CO3, acetone, reflux, 18 h. (b) NaOH, ethanol, reflux, 2 h. (c) HCl, water. (d) DCC, DMAP, CH2Cl2, reflux, 18 h. (e) Silica gel, dichloromethane–toluene–ethyl acetate (75:25:1). (f) H2, 10% Pd/C, THF, 40 °C, 16 h. (g) 5% Na2CO3, rt, 6 h.
