1: morpholinosulfur trifluoride / CHCl3 / 82 h / 30 - 40 °C 2: K2CO3 / methanol / 3 h / 20 °C 3: 83 percent / diisobutylaluminum hydride / tetrahydrofuran; toluene / 1 h / -78 °C 4: NaN(SiMe3)2 / tetrahydrofuran / 3 h / 0 °C View Scheme

diethylamino-sulfur trifluoride in dichloromethane T=0 - 35°C; 24 h; Inert atmosphere; Time;