1: 88 percent / imidazole / dimethylformamide / 20 h / Ambient temperature 2: 98 percent / H3PO2 aq., AIBN, Et3N / dioxane / 1 h / Heating 3: 96 percent / CAN, pyridine / H2O; acetonitrile / 0.5 h / 0 °C 4: 1) (COCl)2, DMSO, 2) Et3N / 1) CH2Cl2, -78 deg C, 2) CH2Cl2, -78 to 0 deg C 5: 85 percent / CrCl2 / dimethylformamide; tetrahydrofuran / 8 h / Heating 6: 87 percent / nBu4NF*3H2O / tetrahydrofuran / 7 h / Ambient temperature 7: 99 percent / pyridine / 2.5 h / Ambient temperature 8: 1) PdCl2(CH3CN)2, 2) DIBAL, 3) t-BuOK / 1) THF, 2 h, RT, 2) THF, -78 deg C, 14 h, 3) THF, 1 h, RT 9: 93 percent / H3PO4, H2O / tetrahydrofuran / 6 h / 40 °C View Scheme