1: 58 mg / m-chloroperbenzoic acid, 5percent sodium hydrogencarbonate / CH2Cl2 / 4 h / -15 °C 2: 77 mg / LAH / 1,2-dimethoxy-ethane; tetrahydrofuran / 2 h / Ambient temperature 3: 80 percent / lead(IV) acetate / pyridine / 0.5 h / Ambient temperature 4: 83 percent / diisobutylaluminium hydride (DIBAH) / 1,2-dimethoxy-ethane; hexane / 1.5 h / -78 - 0 °C 5: 84 percent / 4-(dimethylamino)pyridine, triethylamine / 16 h / Ambient temperature View Scheme