1.1: 93 percent / triethylamine; DMAP / CH2Cl2 / 24 h / 20 °C 2.1: 97 percent / diisobutylaluminum hydride / CH2Cl2; hexane / 0.5 h / -78 °C 3.1: 97 percent / DMSO; diisopropylethylamine; SO3*pyridine / CH2Cl2 / 1 h / 0 °C 4.1: BF3*Et2O / tetrahydrofuran; hexane / 0.08 h / -78 °C 4.2: tetrahydrofuran; hexane / 4 h / -78 °C 4.3: 340 mg / aq. H2O2 / tetrahydrofuran; hexane; aq. phosphate buffer / 16 h / 20 °C 5.1: 85 percent / imidazole / various solvent(s) / 72 h / 40 °C 6.1: 4 Angstroem molecular sieves; SnCl4 / CH2Cl2 / -40 °C 7.1: TBAF / dimethylformamide; tetrahydrofuran / 6 h / 90 °C 8.1: 0.5 h / 20 °C 9.1: Pd(PPh3)4; water / tetrahydrofuran / 2 h / 20 °C 10.1: AgNO3/SiO2 / hexane; CH2Cl2 / 2 h 11.1: KCN / methanol / 0.33 h View Scheme