hydrogen; palladium on activated charcoal in ethanol; acetic acid 1 h;

1: 83.4 percent / H2 / Pd/C (10percent) / ethanol; acetic acid / 1 h 2: 63 percent / SO2Cl2 / acetonitrile / 1.5 h / 35 - 40 °C View Scheme

1: 83.4 percent / H2 / Pd/C (10percent) / ethanol; acetic acid / 1 h 2: 63 percent / SO2Cl2 / acetonitrile / 1.5 h / 35 - 40 °C 3: 62 percent / HOAc / CH2Cl2 / 0.17 h / Ambient temperature View Scheme

1: 83.4 percent / H2 / Pd/C (10percent) / ethanol; acetic acid / 1 h 2: 84.9 percent / pyridine / 0.42 h / Ambient temperature View Scheme