1: 99 percent / N-ethyl-N-isopropylaniline-borane complex; Corey's CBS reagent / tetrahydrofuran / 0.17 h / 25 °C 2: 96 percent / aq. NaOH / diethyl ether / 3 h / 20 °C View Scheme

sodium azide in acetone 1 h; Ambient temperature;

18-crown-6 ether; potassium iodide in acetonitrile T=20°C; Iodination; 1 h;