1: 93 percent / Et3N / CHCl3 / 1 h / 0 °C 2: 79 percent / sulfuryl chloride / hexane / 1.5 h / Heating 3: 69 percent / NaOAc / tetrahydrofuran / 4 h / Heating View Scheme

triethylamine in chloroform T=0°C; 1 h;