1: 398 mg / BF3*Et2O / CH2Cl2 / 1 h / -90 °C 2: 76 mg / SmI2 / tetrahydrofuran; methanol / 14 h / -16 °C 3: 97 percent / NEt3; DMAP / CH2Cl2 / 14 h / 20 °C 4: 82 percent / DDQ / CH2Cl2; H2O / 0.25 h 5: TPAP; NMO; 4 Angstroem molecular sieves / CH2Cl2 / 0.42 h 6: 130 mg / diisopropylamine; n-BuLi / tetrahydrofuran; methyl acetate / 1 h / -78 - 20 °C 7: 86 percent / aq. HCl / methanol / 12 h / Heating View Scheme