1: 66 percent / BuLi / tetrahydrofuran / -78 - 25 °C 2: m-CPBA / CH2Cl2 / 0 °C 3: CCl4; methanol 4: 2.) Bu3SnCH2I / 1.) THF, -78 deg C, 2 h; 2.) THF, -20 deg C, 1 h View Scheme

1: m-CPBA / CH2Cl2 / 0 °C 2: CCl4; methanol 3: 2.) Bu3SnCH2I / 1.) THF, -78 deg C, 2 h; 2.) THF, -20 deg C, 1 h View Scheme

1: CCl4; methanol 2: 2.) Bu3SnCH2I / 1.) THF, -78 deg C, 2 h; 2.) THF, -20 deg C, 1 h View Scheme

(iodomethyl)tri-n-butylstannane 1.) THF, -78 deg C, 2 h; 2.) THF, -20 deg C, 1 h; Yield given. Multistep reaction;