1.1: DIBAL-H; BHT / toluene 2.1: pyridine 3.1: (i-Pr)MgCl / tetrahydrofuran / -10 °C 4.1: DBU / CH2Cl2 5.1: n-butyllitium / tetrahydrofuran; hexane; hexamethylphosphoric acid triamide / 1 h / -78 °C 5.2: 73 percent / tetrahydrofuran; hexane; hexamethylphosphoric acid triamide / 4 h / -78 °C 6.1: (EtO)3SiH / Cp*Ru(CH3CN)3PF6 / CH2Cl2 / 3 h / 20 °C 6.2: 92 percent / cesium fluoride; ethanol / CH2Cl2 / 12 h / 20 °C 7.1: pyridine / CH2Cl2 8.1: DIBAL-H / tetrahydrofuran / -78 °C 9.1: potassium hexamethyldisilylazide / 1,2-dimethoxy-ethane / 1 h / -78 °C 9.2: 1,2-dimethoxy-ethane / -78 - 20 °C 10.1: CAN; H2O / acetone 11.1: aq. NaOH / tetrahydrofuran; methanol 12.1: 61 percent / MsCl; Et3N; 2,4,6-trichlorobenzoyl chloride / 4-DMAP / toluene / Heating 13.1: 77 percent / TBAF / tetrahydrofuran / 20 °C View Scheme