1: 2,6-lutidine / CH2Cl2 / -78 - 20 °C 2: HCl / tetrahydrofuran; methanol / 0 °C 3: 1.) Et3N, 2,4,6-trichlorobenzoyl chloride, 2.) DMAP / 1.) THF, RT, 15 min, 2.) THF, toluene, 0.5 h 4: 82 percent / SmI2, NiI2 / tetrahydrofuran / 2 h / -78 °C 5: 91 percent / HF*pyridine / tetrahydrofuran / 5 h / 0 °C 6: 80 percent / DMDO / CH2Cl2 View Scheme

1: 2,6-lutidine / CH2Cl2 / -78 - 20 °C 2: HCl / tetrahydrofuran; methanol / 0 °C 3: 1.) Et3N, 2,4,6-trichlorobenzoyl chloride, 2.) DMAP / 1.) THF, RT, 15 min, 2.) THF, toluene, 0.5 h 4: 82 percent / SmI2, NiI2 / tetrahydrofuran / 2 h / -78 °C 5: 91 percent / HF*pyridine / tetrahydrofuran / 5 h / 0 °C View Scheme