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a Reagents and conditions: (i) (a) HCl (20%), 60 h, rt, Ar; (b) H2O2 (30%), rt, 1 d. (ii) NaOH, CH2Cl2,H2O, benzyl triethylammonium chloride (TEBAC), rt, Ar, 1 d. (iii) (a) NaH, DMF, rt; (b) Br(CH2)3Cl, 30 °C, 1 d. (iv) Sodium 4-mercaptoethylbutanoate, EtOH, rt, 1 d. (v) 3 M HCl, reflux, 3 h.
