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Reagents and conditions: (a)450 oxone, THF/H2O (4:1), rt, 2 h; (b) (1) NaOH, EtOH/H2O (10:1), reflux, 2 h, (2) aq. HCl (3 N); (c) Ac2O, reflux; (d) o-phenylenediamine, DCC, THF, reflux, 8 h; (e)451t-BuOOH (6 equiv), DCM, 40 °C, 5 h; (f) (1) p-toluidine, DCC, THF, reflux, 12 h.
