1: 1.) n-BuLi / 1.) THF, -75 deg.C, 15 min.; 2.) THF, 10 min., -75 deg C 2: pyridinium chlorochromate / CH2Cl2 / 2.5 h 3: N,N-dimethyl-acetamide / 0.75 h 4: 5percent HCl / ethanol / 2 h / Heating View Scheme

1: 1.) n-BuLi / 1.) THF, -75 deg.C, 15 min.; 2.) THF, 10 min., -75 deg C 2: pyridinium chlorochromate / CH2Cl2 / 2.5 h 3: N,N-dimethyl-acetamide / 0.75 h 4: 5percent HCl / ethanol / 2 h / Heating View Scheme

1: N,N-dimethyl-acetamide / 0.75 h 2: 5percent HCl / ethanol / 2 h / Heating View Scheme

1: pyridinium chlorochromate / CH2Cl2 / 2.5 h 2: N,N-dimethyl-acetamide / 0.75 h 3: 5percent HCl / ethanol / 2 h / Heating View Scheme