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Reagents and conditions: (i) Ac2O, NaOAc, AcOH, RT, 12 h; (ii) ClSO3H, CHCl3, RT, 1 h; (iii) (a) SnCl2·2H2O, AcOH, HCl, RT, 2 h; (b) NaOMe, MeI, MeOH; (iv) mCPBA, CHCl3; (v) 3 N HCl.
