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Reagents and conditions: (a) NBS, AIBN, CCI4. light, 89%; (b) Ag2O, pyridine N-oxide, MeCN, 81%; (c) toluenesulfonylmethyl isocyanide, K2CO3, MeOH, 73%; (d) iodobenzene, Pd(OAc)2, Cs2CO3, Cul, DMF, 160 °C, 95%; (e) Ra-Ni, NH2NH2, MeOH, 50 °C, 94%; (f) (i) S-(2-naphthylmethyl)-2-pyridylthioimidate hydrobromide, EtOH/CH3CN, rt, (ii) CH3SO3H, CH2CI2, 71%.
