1.1: sodium tetrahydroborate / methanol; tetrahydrofuran / 0.75 h / -10 °C 2.1: phosphorus tribromide / tetrahydrofuran / 3 h / 0 °C / |Inert atmosphere 3.1: N,N-dimethyl-formamide / 18 h / 20 °C / |Darkness 4.1: potassium tert-butylate / tetrahydrofuran; N,N-dimethyl-formamide / 2.67 h / -78 °C 4.2: -78 - 20 °C 5.1: sodium hydroxide; water / methanol / 1 h / 20 °C / pH 12 6.1: Pd(1,2-bis(diphenylphosphino)ethane)Cl2; lithium triethylborohydride / tetrahydrofuran / 1.17 h / 0 °C / |Inert atmosphere 7.1: phosphorus tribromide / tetrahydrofuran / 0.5 h / 0 °C / |Inert atmosphere; |Cooling with acetone-dry ice 8.1: sodium hexamethyldisilazane / tetrahydrofuran; N,N-dimethyl-formamide / 0.83 h / -20 °C / |Inert atmosphere; |Cooling with acetone-dry ice 9.1: Pd(1,2-bis(diphenylphosphino)ethane)Cl2 / tetrahydrofuran / 0.08 h / |Inert atmosphere; |Cooling with acetone-dry ice 9.2: 5 h / 0 °C / |Inert atmosphere 10.1: ammonium cerium (IV) nitrate / water; dichloromethane; acetonitrile / 0.25 h / 0 °C View Scheme