1: SOCl2 / 2 h / Heating 2: hydrazine hydrate / CH2Cl2; ethanol / 3 h / Ambient temperature 3: 1.) MeCN, reflux, 1 h, 2.) 110 deg C, 2 h 4: 0.17 h / 200 °C View Scheme

1: hydrazine hydrate / CH2Cl2; ethanol / 3 h / Ambient temperature 2: 1.) MeCN, reflux, 1 h, 2.) 110 deg C, 2 h 3: 0.17 h / 200 °C View Scheme

1: 1.) MeCN, reflux, 1 h, 2.) 110 deg C, 2 h 2: 0.17 h / 200 °C View Scheme