1: 49 percent / AIBN / dioxane / 24 h / Heating 2: 1.) OsO4, N-methylmorpholine oxide, 2.) NaIO4 / 1.) Me2CO, H2O, , room temperature, 17 h, 2.) dioxane, H2O, room temperature, 40 h 3: BH3*Me2S / tetrahydrofuran / 3 h / 0 °C 4: 1.) PPh3, diisopropyl diazodicarboxylate, Zn(N3)2*2 pyridine, 2.) nBu3SnH, AIBN / 1.) toluene, room temperature, 24 h, 2.) benzene, reflux, 23 h View Scheme

1: 1.) OsO4, N-methylmorpholine oxide, 2.) NaIO4 / 1.) Me2CO, H2O, , room temperature, 17 h, 2.) dioxane, H2O, room temperature, 40 h 2: BH3*Me2S / tetrahydrofuran / 3 h / 0 °C 3: 1.) PPh3, diisopropyl diazodicarboxylate, Zn(N3)2*2 pyridine, 2.) nBu3SnH, AIBN / 1.) toluene, room temperature, 24 h, 2.) benzene, reflux, 23 h View Scheme

1: BH3*Me2S / tetrahydrofuran / 3 h / 0 °C 2: 1.) PPh3, diisopropyl diazodicarboxylate, Zn(N3)2*2 pyridine, 2.) nBu3SnH, AIBN / 1.) toluene, room temperature, 24 h, 2.) benzene, reflux, 23 h View Scheme

Zn(N3)2/bis-pyridine complex; 2,2'-azo-bisisobutyronitrile; di-isopropyl azodicarboxylate; tri-n-butyl-tin hydride; triphenylphosphine 1.) toluene, room temperature, 24 h, 2.) benzene, reflux, 23 h; Yield given. Multistep reaction;