1: triethylamine / CH2Cl2 / 0.75 h / 20 °C 2: 90 percent / NaN3 / dimethylformamide / 17.5 h / 20 °C 3: 82 percent / PtCl4; 2,6-di-tert-butyl-4-methylpyridine / 1,2-dichloro-ethane / 0.83 h / Heating View Scheme

1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione in dimethyl sulfoxide T=20°C; 20 h;

iodine; sodium hydrogencarbonate in acetonitrile T=20°C;