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Reactions and conditions: (a) Boc2O, DMAP, MeCN, reflux, 100%; (b) 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline, Pd(dppf)Cl2, Cs2CO3, dioxane–water, 100 °C, 2 h, 70%; (c) RSO2Cl, pyridine, CH2Cl2, rt. 15 h; (d) CF3CO2H, rt, 3 h.
