1: 72 percent / NaH / benzene / 1. 3 h reflux; 2. room temp., overnight 2: 79 percent / KOH / ethanol; H2O / 6 h / Heating 3: 95 percent / Piperidine / pyridine / 2.5 h / Heating 4: 88 percent / SOCl2 / benzene / 1. 60-70 deg C, 2.5 h; 2. 0.5 h reflux 5: 99 percent / NH3 / benzene / Ambient temperature View Scheme

1: 72 percent / NaH / benzene / 1. 3 h reflux; 2. room temp., overnight 2: 79 percent / KOH / ethanol; H2O / 6 h / Heating 3: 95 percent / Piperidine / pyridine / 2.5 h / Heating View Scheme