1: 86.6 percent / 4 percent KOH / dioxane; H2O / 1.5 h / Ambient temperature 2: 93.7 percent / L-Selectride / tetrahydrofuran / 3 h / -78 °C 3: 92.4 percent / pyridine / Ambient temperature 4: 81.9 percent / potassium t-butoxide / 2-methyl-propan-2-ol / 1 h / 40 °C 5: H2 / PtO2 / diethyl ether / 760 Torr / Ambient temperature View Scheme