triethylamine in dichloromethane T=5°C; 1.5 h;

1.1: sodium hydrogencarbonate / dichloromethane; water / 2.17 h / 0 - 20 °C 2.1: zinc(II) chloride / ethanol / 2.25 h / 20 °C 2.2: 18 h / 50 °C 2.3: pH 7 3.1: triethylamine / dichloromethane / 0.5 h / 0 - 20 °C View Scheme

1.1: zinc(II) chloride / ethanol / 2.25 h / 20 °C 1.2: 18 h / 50 °C 1.3: pH 7 2.1: triethylamine / dichloromethane / 0.5 h / 0 - 20 °C View Scheme

potassium carbonate in N,N-dimethyl-formamide T=80°C; 20 h;