1.1: potassium carbonate / N,N-dimethyl-formamide / 4 h / 20 °C 1.2: 4 h / |Acidic conditions 2.1: 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione / ethyl acetate / 26 h / |Reflux View Scheme

(i) Mg, Et2O, (ii) /BRN= 1742942/; Multistep reaction;