potassium carbonate in ethanol 10 h; Heating;

1: 76 percent / piperidine / pyridine / 2 h / Heating 2: 60.8 percent / NaOH, CuSO4*5H2O / H2O / 12 h / Heating 3: 96 percent / H2, 10percent NaOH / 10percent Pd/C / ethanol / Ambient temperature 4: 80 percent / K2CO3 / ethanol / 10 h / Heating View Scheme

1: 97 percent / K2CO3 / dimethylformamide / 5 h / 100 - 120 °C 2: 76 percent / piperidine / pyridine / 2 h / Heating 3: 60.8 percent / NaOH, CuSO4*5H2O / H2O / 12 h / Heating 4: 96 percent / H2, 10percent NaOH / 10percent Pd/C / ethanol / Ambient temperature 5: 80 percent / K2CO3 / ethanol / 10 h / Heating View Scheme