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Reagents and conditions: (a)381 AcOH, DMSO/HCl (conc.); (b) O2, 1 N NaOH; (c) HBr, AcOH, 80 °C; (d) (1) Ag2O, CeCl3·7H2O, MeOH/AcOH (1:1), 40 °C, (2) 6 N HCl, 90 °C; (e) (CH2O)n, AcOH, 60 °C, 5 h; (f) K3[Fe(CN)6], aq. NaOH, 0 °C.
