1: 93 percent / Zn, chlorotrimethylsilane / CH2Cl2 / 0.5 h / 0 °C 2: 72 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature 3: 65 percent / silica gel, 15percent H2SO4 / CH2Cl2 / 24 h / Ambient temperature View Scheme

With  chloro-trimethyl-silane; zinc in  dichloromethane T=0°C; 0.5 h;   

Multi-step reaction with 2 steps 1: 93 percent / Zn, chlorotrimethylsilane / CH2Cl2 / 0.5 h / 0 °C2: 72 percent / pyridine, Cr2O3, kieselguhr / CH2Cl2 / 0.33 h / Ambient temperature