1: benzenesulfonyl chloride, pyridine / 15 h / 0 °C 2: 92 percent / H2 / 10percent Pd/C / tetrahydrofuran / 15 h 3: DCC, DMAP / CH2Cl2; dimethylformamide / 1 h / Ambient temperature 4: H2 / 10percent Pd/C / tetrahydrofuran / 4 h / Ambient temperature 5: CH2Cl2 / 0.25 h / Ambient temperature View Scheme

1: benzenesulfonyl chloride, pyridine / 15 h / 0 °C 2: 92 percent / H2 / 10percent Pd/C / tetrahydrofuran / 15 h 3: DCC, DMAP / CH2Cl2; dimethylformamide / 1 h / Ambient temperature View Scheme