1: 85 percent / imidazole / various solvent(s) / 72 h / 40 °C 2: 4 Angstroem molecular sieves; SnCl4 / CH2Cl2 / -40 °C 3: TBAF / dimethylformamide; tetrahydrofuran / 6 h / 90 °C 4: 0.5 h / 20 °C 5: Pd(PPh3)4; water / tetrahydrofuran / 2 h / 20 °C 6: AgNO3/SiO2 / hexane; CH2Cl2 / 2 h 7: KCN / methanol / 0.33 h View Scheme