1: 82 percent / SO2Cl2 / CH2Cl2 / 2 h / Heating 2: H2 / 10percent Pd/C / methanol / 20 h / Ambient temperature 3: CrO3 / acetone / 0.33 h / Ambient temperature View Scheme

1: 82 percent / SO2Cl2 / CH2Cl2 / 2 h / Heating 2: H2 / 10percent Pd/C / methanol / 20 h / Ambient temperature View Scheme

N-chloro-succinimide; sulfuric acid in methanol 3 h; on an ice bath;

N-chloro-succinimide; sulfuric acid 3 h; on an ice bath;