in dichloromethane; N,N-dimethyl-formamide T=25°C; 12 h; regioselective reaction;

1: iodine; 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / dimethyl sulfoxide / 20 °C 2: dichloromethane; N,N-dimethyl-formamide / 12 h / 20 °C View Scheme

in ethanol Heating;