1.1: O3 / CH2Cl2 / -78 °C 1.2: Me2S / CH2Cl2 2.1: n-BuLi / tetrahydrofuran / -78 °C 3.1: DIBALH / CH2Cl2 / -78 °C 4.1: imidazole / dimethylformamide 5.1: MgBr2 / diethyl ether / 20 °C 6.1: TiCl4; Zn; pyridine / 1,2-dimethoxy-ethane / Heating 7.1: PPTs / ethanol / 20 °C 8.1: Ti(i-PrO)4; L-(+)-DET; t-BuOOH / CH2Cl2 / -20 °C 9.1: I2; Ph3P; imidazole / diethyl ether; acetonitrile / 0 °C 10.1: NaBH3(CN) / tetrahydrofuran; hexamethylphosphoric acid triamide / 60 °C 11.1: TBAF / tetrahydrofuran View Scheme