1: 76.8 percent / H2, HCl / Raney Ni / ethanol / 1.5 h / Ambient temperature 2: 75 percent / DMAP / pyridine / 2 h / 0 °C 3: Tl2CO3, Pd<P(C6H5)3>4 / benzene / 23 h / Ambient temperature 4: nBuNF, HMPA, 4 Angstroem molecular sieves / tetrahydrofuran / 8 h / Ambient temperature 5: MnO2 / CH2Cl2 / 1 h / Heating View Scheme