1: potassium t-butoxide / dimethylsulfoxide / 60 °C 2: 1.) dicyclohexylborane, 2.) H2O2, NaOH / 1.) THF, 25 deg C; 2.) EtOH 3: 88 percent / H2 / Pd(OH)2-C / methanol 4: pyridine; CH2Cl2 5: NaI / butan-2-one 6: ethanol View Scheme