1: 98 percent / 2-methyl2-butene, NaClO2, NaH2PO4 / 2-methyl-propan-2-ol; H2O / 1 h / 25 °C 2: 1.) carbonyldiimidazole, 2.) NH3 / 1.) CH2Cl2, 25 deg C, 1.5 h, 2.) CH2Cl2, 25 deg C, overnight 3: 91 percent / lead tetraacetate / dimethylformamide / 1 h / 100 - 110 °C 4: 1.) ozone, 2.) dimethyl sulfide / 1.) CH2Cl2, -78 deg C, 15 min, 2.) CH2Cl2, 25 deg C, overnight 5: 96 percent / H2 / 9percent Pd/C / methanol / 2 h / 25 °C View Scheme