1: 75 percent / PtO2; H2 / ethanol / 2 h / 20 °C 2: 92 percent / pyridine / CH2Cl2 / 3 h / Heating 3: 96 percent / tetra-n-butylammmonium fluoride / tetrahydrofuran / 6 h / 20 °C 4: 66 percent / o-iodoxybenzoic acid / 14 h / 20 °C 5: 78 percent / HCl / methanol / 1 h / 20 °C 6: 77 percent / diethyl azodicarboxylate; PPh3 / tetrahydrofuran / 3 h / 20 °C View Scheme