Yield given. Multistep reaction;

Multi-step reaction with 5 steps 1: 94 percent / imidazole, 1-hydroxybenzotriazole / dimethylformamide / 72 h / 50 - 60 °C2: 1.) NBS; 2.) γ-collidine / 1.) hexane, reflux, 1 h; 2.) xylene, reflux, 1 h3: 64 percent / dimethylsulfoxide; tetrahydrofuran / Ambient temperature4: 1.) 9-BBN; 2.) NaOH, H2O2 / 1.) THF, r.t., 16 h5: 86 percent / NaH / xylene / 22 h / Heating  

Multi-step reaction with 4 steps 1: 1.) NBS; 2.) γ-collidine / 1.) hexane, reflux, 1 h; 2.) xylene, reflux, 1 h2: 64 percent / dimethylsulfoxide; tetrahydrofuran / Ambient temperature3: 1.) 9-BBN; 2.) NaOH, H2O2 / 1.) THF, r.t., 16 h4: 86 percent / NaH / xylene / 22 h / Heating  

Multi-step reaction with 3 steps 1: 64 percent / dimethylsulfoxide; tetrahydrofuran / Ambient temperature2: 1.) 9-BBN; 2.) NaOH, H2O2 / 1.) THF, r.t., 16 h3: 86 percent / NaH / xylene / 22 h / Heating  

Multi-step reaction with 2 steps 1: 1.) 9-BBN; 2.) NaOH, H2O2 / 1.) THF, r.t., 16 h2: 86 percent / NaH / xylene / 22 h / Heating