1: aq. CaCO3, MeI / acetonitrile / 60 °C 2: BH3*Me2S / tetrahydrofuran / 0 °C 3: 1.) N-(phenylseleno)phthalimide, PBu3, 2.) Bu3SnH, AIBN / 1.) CH2Cl2, -20 deg C, 2.) PhMe, 80 deg C 4: 61 percent / PPh3, diisopropyl azodicarboxylate / tetrahydrofuran / Ambient temperature 5: MCPBA / CH2Cl2 / 96 h / Ambient temperature View Scheme