1: 79 percent / KOH / ethanol; H2O / 6 h / Heating 2: 95 percent / Piperidine / pyridine / 2.5 h / Heating 3: 88 percent / SOCl2 / benzene / 1. 60-70 deg C, 2.5 h; 2. 0.5 h reflux 4: 99 percent / NH3 / benzene / Ambient temperature View Scheme

1: 79 percent / KOH / ethanol; H2O / 6 h / Heating 2: 95 percent / Piperidine / pyridine / 2.5 h / Heating View Scheme