1: 53.8 percent / t-BuOK / 2-methyl-propan-2-ol / 1.) 70 deg C, 36 h, 2.) reflux, 1 h 2: 94 percent / NaIO4 / H2O; methanol / 20 h / Ambient temperature 3: LDA / tetrahydrofuran / 1.) -78 deg C, 30 min, 2.) 30 min, ice bath 4: Al-Hg / tetrahydrofuran; H2O / 6 h / Heating View Scheme

potassium tert-butylate in tert-butyl alcohol 1.) 70 deg C, 36 h, 2.) reflux, 1 h;