1.1: 49 percent / various solvent(s) / 1 h / 180 °C 2.1: 89 percent / tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C 3.1: PhLi / cyclohexane; diethyl ether; dioxane / 0.17 h / cooling 3.2: 78 percent / cyclohexane; diethyl ether; dioxane / 12 h / 20 °C 4.1: 96 percent / BF3*Et2O; Me2S / CH2Cl2 / 18 h / 20 °C 5.1: 95 percent / salcomine; O2 / dimethylformamide / 2 h / 20 °C View Scheme

1.1: 49 percent / various solvent(s) / 1 h / 180 °C 2.1: 89 percent / tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C 3.1: PhLi / cyclohexane; diethyl ether; dioxane / 0.17 h / cooling 3.2: 64 percent / cyclohexane; diethyl ether; dioxane / 0.5 h / 20 °C 4.1: 81 percent / NaN3 / H2O; dioxane / 1 h / 60 °C 5.1: PPh3 / benzene / 12 h / 20 °C 5.2: 45 percent / benzene / 0.08 h / 20 °C 6.1: 91 percent / H2 / Pd/C / ethanol / 2 h / 20 °C 7.1: 85 percent / salcomine; O2 / dimethylformamide / 2 h / 20 °C View Scheme

1.1: 49 percent / various solvent(s) / 1 h / 180 °C 2.1: 89 percent / tetrabutylammonium fluoride / tetrahydrofuran / 1 h / 20 °C 3.1: PhLi / cyclohexane; diethyl ether; dioxane / 0.17 h / cooling 3.2: 64 percent / cyclohexane; diethyl ether; dioxane / 0.5 h / 20 °C 4.1: 85 percent / LiEt3BH / tetrahydrofuran / 0.17 h / cooling 5.1: 91 percent / H2 / Pd/C / ethanol / 2 h / 20 °C 6.1: 85 percent / salcomine; O2 / dimethylformamide / 2 h / 20 °C View Scheme