1: chloroform / 10 h / Reflux; Inert atmosphere 2: 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 10 h / Reflux; Inert atmosphere 3: water; sodium hydroxide / tetrahydrofuran / 15 h / Reflux; Inert atmosphere 4: tetrahydrofuran / 2 h / 20 °C / Inert atmosphere 5: sodium periodate / tetrahydrofuran; water / 2 h / 20 °C / Inert atmosphere 6: diisobutylaluminium hydride / tetrahydrofuran / 5 h / Inert atmosphere; Cooling with ice 7: potassium tert-butylate / tetrahydrofuran / 1 h / Reflux; Inert atmosphere View Scheme

N-bromosuccinmide; acetic acid T=60°C; 2 h; Inert atmosphere;

N-bromosuccinmide; acetic acid Inert atmosphere;