1: dimethylformamide / 4 h / Heating 2: Raney-Ni / H2O; formic acid / 2 h / Heating View Scheme

1: dimethylformamide / 4 h / Heating 2: Raney-Ni / H2O; formic acid / 2 h / Heating 3: 1.) HCO3H; 2.) 5 percent KOH / 1.) formic acid; 2.) ether 4: 1.8 g / K2CO3 / dimethylformamide / 1 h / 120 °C / Heating View Scheme

1: dimethylformamide / 4 h / Heating 2: Raney-Ni / H2O; formic acid / 2 h / Heating 3: 1.) HCO3H; 2.) 5 percent KOH / 1.) formic acid; 2.) ether 4: 1.8 g / K2CO3 / dimethylformamide / 1 h / 120 °C / Heating 5: 400 mg / POCl3 / Ambient temperature View Scheme