1: conc. H2SO4, molecular sieves 4A, Na2SO4 / 13 h / Ambient temperature 2: 87 percent / H2, ethylenediamine / P-2 Ni catalyst / ethanol / 5 h / 23 °C 3: 82 percent / pyridine / CH2Cl2 / 8 h / 0 °C 4: CaCO3 / acetonitrile / 48 h / 90 °C 5: 73 percent / NaHMDS / tetrahydrofuran / 1.) 0 deg C, 10 min, 2.) -78 deg C to r.t., 3 h 6: 90 percent / 4 N aq. HCl, methylene blue / tetrahydrofuran / 0.5 h 7: 0.8 M aq. NaIO4, 60-200 mesh SiO2 / CH2Cl2 / 0.08 h / Ambient temperature 8: NaHMDS / 1.) THF, -75 deg C, 2.) CH2Cl2, -75 deg C to r.t., 4 h View Scheme