1: 26 percent / Ph3P, CBr4 / CH2Cl2 / 15 h / Ambient temperature 2: 8 percent / H2O2, CF3COOAg / diethyl ether / 0.5 h / 0 °C 3: 69 percent / NaBH4 / methanol / 0.08 h / 0 °C View Scheme

Multi-step reaction with 5 steps 1: 87 percent / Et3N / CH2Cl2 / 1 h / 0 °C2: 65 percent / 18-crown-6 / toluene / 8 h / Heating3: 81 percent / NaOMe / methanol / 1 h / Ambient temperature4: pyridine / CH2Cl2 / 0.5 h / 0 °C5: (n-Bu3SnO)2 / CH2Cl2; diethyl ether / 1 h / 0 °C  

Multi-step reaction with 2 steps 1: 26 percent / Ph3P, CBr4 / CH2Cl2 / 15 h / Ambient temperature2: 8 percent / H2O2, CF3COOAg / diethyl ether / 0.5 h / 0 °C