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aReagents and conditions: i) I2, H2SO4, HIO4, AcOH, H2O, 70°C ii) 3- or 4-mercaptophenylacetic acid methyl ester, borohydride, polymer supported, (bpy)2NiBr2, dioxane, ButOH, 130–145°C, 3 h to 5 h; iii) oxone, H2O, MeOH, 0°C to r.t., 12 h; iv) LiOH 1N, THF, H2O, r.t. 12h.
