1.1: potassium carbonate / N,N-dimethyl-formamide / 10 h / 25 - 45 °C 2.1: methylamine / methanol / 60 - 65 °C 2.2: 1.5 h / 25 - 65 °C / pH 5.5 - 6.0 3.1: sodium carbonate / water; dichloromethane / 0 - 35 °C View Scheme