1: 1.) LDA, HMPA / 1.) THF, -78 deg C, 30 min, 2.) THF, from -78 deg C to RT, 4 h 2: 96 percent / PdCl2, CuCl, air / dimethylformamide; H2O / 4.5 h / Ambient temperature 3: 84 percent / NaHMDS, HMPA / tetrahydrofuran / 0.67 h / -78 - -50 °C / a) -78 deg C. 15 min, b) 0 deg C, 15 min, c) 50 deg C, 10 min 4: 1.) lithium hexamethyldisilazane, HMPA / 1.) THF, -78 deg C, 1 h, 2.) THF, from -78 deg C to RT, 2 h 5: 86 percent / lithium tetramethyldisilazane, HMPA / tetrahydrofuran / 2 h / -78 - 20 °C 6: 93 percent / H2 / 5percent Pd/C / methanol / 2 h / 760 Torr / Ambient temperature 7: NaBH4 / methanol / 2 h / Ambient temperature 8: pyridine, DMAP / CH2Cl2 / 6 h / Ambient temperature 9: 68 percent / n-Bu3SnH, AIBN / toluene / 3 h / Heating 10: 100 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 6 h / Ambient temperature 11: 100 percent / Et3N, DMAP / CH2Cl2 / 2 h / 0 °C 12: 89 percent / DBU / toluene / 18 h / 100 °C View Scheme