triethylamine in tetrahydrofuran T=25°C; 1 h;

1: With hydrogenchloride in methanol; water; isopropyl alcohol T=50°C; 1.5 h; 2: With sodium nitrite in methanol; water; isopropyl alcohol T=0 - 70°C; 1.25 h;

in toluene; xylene T=10 - 95°C; P=150.015 Torr;

1: With hydrogenchloride in methanol; water; isopropyl alcohol T=50°C; 1.5 h; 2: With sodium nitrite in methanol; water; isopropyl alcohol T=0 - 20°C; 1 h; 3: With isopropyl alcohol in methanol; water T=70°C; 0.25 h;

phosphorus trichoride in acetonitrile T=150°C; 0.166667 h; Microwave irradiation;

1.1: hydrogenchloride; titanium(III) chloride / water / 20 °C 1.2: 0.42 h 2.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 3.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 4.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 4.2: 1.25 h / 0 - 70 °C View Scheme

1.1: hydrogenchloride; titanium(III) chloride / water / 20 °C 1.2: 0.42 h 2.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 3.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 4.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 4.2: 1.25 h / 0 - 70 °C View Scheme

1.1: hydrogenchloride; sodium nitrite / water / 0.42 h / 0 °C / Inert atmosphere 1.2: 0.27 h 2.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 3.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 4.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 4.2: 1.25 h / 0 - 70 °C View Scheme

1.1: hydrogenchloride; titanium(III) chloride / water 1.2: 13 h / 25 °C / Inert atmosphere 1.3: pH 5.5 2.1: hydrogenchloride; sodium nitrite / water / 0.42 h / 0 °C / Inert atmosphere 2.2: 0.27 h 3.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 4.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 5.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 5.2: 1.25 h / 0 - 70 °C View Scheme

1.1: dichloromethane / 12 h / 0 - 20 °C / Inert atmosphere 2.1: triethylamine / dichloromethane / 0 - 20 °C / Reflux 3.1: hydrogenchloride / isopropyl alcohol; water; methanol / 1.5 h / 50 °C 3.2: 1.25 h / 0 - 70 °C View Scheme