nickel dichloride; zinc in pyridine 1.) 60 deg C, 30 min, 2.) 20 deg C, 2.0 h;

Multi-step reaction with 2 steps 1: 71 percent / I2, PPh3, imidazole / CH2Cl2 / 1.) 5 deg C, 0.5 h, 2.) room temperature, 2.0 h2: 92.5 percent / NaHCO3 / ethanol / 2 h / Heating  

Multi-step reaction with 5 steps 1: 1H-imidazole / dichloromethane / 5 - 20 °C / |Inert atmosphere2: sodium acetate; acetic acid; ozone / methanol; dichloromethane / -25 °C / |Inert atmosphere3: sodium tetrahydroborate / methanol; dichloromethane / 2.5 h / -25 - 20 °C / |Inert atmosphere4: 1H-imidazole; triphenylphosphine; iodine / dichloromethane / -2 - 20 °C / |Inert atmosphere5: sodium hydrogencarbonate / ethanol / 2 h / |Inert atmosphere; |Reflux