1: 1H-imidazole / dichloromethane / 0 - 20 °C 2: diisobutylaluminium hydride / dichloromethane; toluene / 2 h / -78 °C / Inert atmosphere 3: 1H-imidazole; iodine; triphenylphosphine / tetrahydrofuran; acetonitrile / 2 h / 0 °C / Inert atmosphere 4: KtBD / benzene / 0.5 h / 20 °C / Inert atmosphere 5: tetrabutyl ammonium fluoride / tetrahydrofuran / 2 h / 20 °C / Inert atmosphere 6: triethylamine / dichloromethane / 6 h / 0 °C / Inert atmosphere 7: RuCl2(tricyclohexylphosphine)2(benzylidene); titanium(IV) isopropylate / dichloromethane / Reflux; Inert atmosphere View Scheme

Multi-step reaction with 3 steps 2: 6 h / Irradiation3: 48 percent / nickel acetate, hydrogen, sodium borohydride / ethanol / 1 h