Reagents and conditions: (a) Pd(PPh3)4, (SnBu3)2, toluene, reflux, 22 h; (b) NaI, chloramine-T, 94% EtOAc, 4% DMF, 1% AcOH, 1% H2O, room temp, 30 min, Na2S3O5; (c) NaOH, 1 h; (d) 3 mCi Na125I and chloramine-T in a mixture of 94% EtOAc, 4% DMF, 1% AcOH, and 1% H2O, room temp, 30 min, Na2S3O5.