1: 92 percent / HCl(g) 2: 1.) NaH / 1.) DMSO, 65 deg C, 105 min, 2.) DMSO, 60 deg C, 90 min 3: 82 percent / NaBH4 / ethanol; H2O / 1.5 h / Ambient temperature 4: 3.7 g / t-BuOK / dimethylsulfoxide; 2-methyl-propan-2-ol / 1.5 h / 48 °C 5: 1.) NaOMe / 1.) EtOH, 2.) EtOH, reflux, 25 h View Scheme