N-bromosuccinmide; triphenylphosphine in dichloromethane T=20°C; 18 h;

1: NaBH4 / ethanol 2: PBr3 / CH2Cl2 3: 76 percent / LiHMDS / tetrahydrofuran 4: 81 percent / LiOH; H2O2 5: 95 percent / LAH / tetrahydrofuran 6: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1: 76 percent / LiHMDS / tetrahydrofuran 2: 81 percent / LiOH; H2O2 3: 95 percent / LAH / tetrahydrofuran 4: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1: PBr3 / CH2Cl2 2: 76 percent / LiHMDS / tetrahydrofuran 3: 81 percent / LiOH; H2O2 4: 95 percent / LAH / tetrahydrofuran 5: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1.1: 4-(N,N-dimethlyamino)pyridine / anhydrous dichloroethane / 0.5 h / 20 °C 1.2: 14.5 h / 10 - 30 °C 2.1: lithium hexamethyldisilazane / tetrahydrofuran / 2 h / -70 °C / Inert atmosphere 2.2: -70 - 5 °C 3.1: dihydrogen peroxide; lithium hydroxide hydrate / water; tetrahydrofuran / 0 - 30 °C 4.1: sodium tetrahydroborate / tetrahydrofuran / 1 h / 0 - 5 °C / Inert atmosphere 4.2: 5.75 h / 0 - 30 °C 5.1: triphenylphosphine; N-bromosuccinmide / dichloromethane / 5.5 h / -40 - 30 °C View Scheme

1: 95 percent / LAH / tetrahydrofuran 2: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1.1: hydrogen; acetic acid / palladium on activated charcoal / 60 - 70 °C / 2942.29 Torr 2.1: dihydrogen peroxide; lithium hydroxide hydrate / water; tetrahydrofuran / 0 - 30 °C 3.1: sodium tetrahydroborate / tetrahydrofuran / 1 h / 0 - 5 °C / Inert atmosphere 3.2: 5.75 h / 0 - 30 °C 4.1: triphenylphosphine; N-bromosuccinmide / dichloromethane / 5.5 h / -40 - 30 °C View Scheme

1: 98 percent / K2CO3 / acetonitrile 2: NaBH4 / ethanol 3: PBr3 / CH2Cl2 4: 76 percent / LiHMDS / tetrahydrofuran 5: 81 percent / LiOH; H2O2 6: 95 percent / LAH / tetrahydrofuran 7: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1: 81 percent / LiOH; H2O2 2: 95 percent / LAH / tetrahydrofuran 3: 97 percent / PPh3; NBS / CH2Cl2 View Scheme

1: 76 percent / LiHMDS / tetrahydrofuran 2: 81 percent / LiOH; H2O2 3: 95 percent / LAH / tetrahydrofuran 4: 97 percent / PPh3; NBS / CH2Cl2 View Scheme