1: 86 percent / anhydrous Na2CO3, anhydrous NaI / acetonitrile / 4.5 h / Heating 2: 58 percent / 0.75M HCl, Dowex 50-WX8, acetic acid / H2O; toluene / 160 h / 108 °C View Scheme

With  sodium carbonate; sodium iodide in  acetonitrile 4.5 h;  Heating;