1: 91 percent / pyridine / CH2Cl2 2: 77 percent / Na/Hg / tetrahydrofuran; methanol / -30 °C 3: 88 percent / TBAF / tetrahydrofuran 4: 99 percent / I2; PPh3; imidazole / benzene 5: 88 percent / dimethylformamide 6: 82 percent / DIBAL-H / CH2Cl2 / -78 °C View Scheme