1.1: tetrahydrofuran / 1 h / 0 °C 2.1: 6.68 g / tetrahydrofuran / 3.5 h / -78 - 20 °C 3.1: KHMDS / tetrahydrofuran / 0.67 h / -78 °C 3.2: 80 percent / trisyl azide; KOAc; AcOH / tetrahydrofuran / -78 - 20 °C 4.1: 90 percent / aq. LiOH / tetrahydrofuran / 0.5 h / 0 °C 5.1: SnCl2 / dioxane; H2O / 7 h / 0 - 20 °C 6.1: aq. NaOH / 1 h / 20 °C 7.1: 95 percent / diethyl ether 8.1: t-BuOOH; pyridine / CCl4 / 13 h / 20 °C 8.2: 93 percent / Et2NH / CCl4 / 4 h / 50 °C 9.1: 71 percent / H2 / Pd/C / ethyl acetate / 3 h / 20 °C View Scheme