alkali hypoiodite T=5°C;

N,N,N',N',N'',N''-hexamethylphosphoric triamide; sodium hydroxide; diisobutylaluminium hydride 1.) Et2O, hexane, from 0 deg C to RT, 5 h, 2.) Et2O, hexane, THF, RT, 1 h; Yield given. Multistep reaction;