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Reagents and conditions: (a) zinc borohydride/dry-benzene/N2, r.t., 2 h; (b) acetic anhydride/pyridine/4,4-dimethylaminopyridine, 50°C, 2 h; (c) 10% HCl/acetone/MeOH, r.t., 10 min; (d) sulfur trioxide trimethylamine complex/pyridine, r.t., 1 h; (e) 10% NaOH/H2O, reflux, overnight.
