1: With ammonium formate; zinc in methanol 0.3 h; 2: With ammonia in methanol T=20°C;

1.1: magnesium sulfate; sodium hydride / dimethyl sulfoxide / 0.5 h 1.2: 48 h 2.1: iron; acetic acid / water; ethanol / 3 h / |Reflux 3.1: potassium carbonate / ethanol / 0.5 h / 20 °C View Scheme

1.1: thionyl chloride; N,N-dimethyl-formamide / dichloromethane / 2.5 h / 20 °C 1.2: 3 h / 0 °C 2.1: magnesium sulfate; sodium hydride / dimethyl sulfoxide / 0.5 h 2.2: 48 h 3.1: iron; acetic acid / water; ethanol / 3 h / |Reflux 4.1: potassium carbonate / ethanol / 0.5 h / 20 °C View Scheme