1: n-BuLi / tetrahydrofuran / -78 °C 2: DIBALH / CH2Cl2 / -78 °C 3: imidazole / dimethylformamide 4: MgBr2 / diethyl ether / 20 °C 5: TiCl4; Zn; pyridine / 1,2-dimethoxy-ethane / Heating 6: PPTs / ethanol / 20 °C 7: Ti(i-PrO)4; L-(+)-DET; t-BuOOH / CH2Cl2 / -20 °C 8: I2; Ph3P; imidazole / diethyl ether; acetonitrile / 0 °C 9: NaBH3(CN) / tetrahydrofuran; hexamethylphosphoric acid triamide / 60 °C 10: TBAF / tetrahydrofuran View Scheme