1: With triethylamine in acetone Cooling with ice; 2: With sodium azide in water; acetone 1 h; Cooling with ice; 3: With tributyl-amine; diphenylamine T=220°C; 1.5 h;

1: pyridine; piperidine / 13 h / 100 °C 2: thionyl chloride / chloroform; N,N-dimethyl-formamide / 3 h / |Reflux 3: sodium azide / 1,4-dioxane; water / 0.5 h / 5 °C 4: chloroform; diphenylether / 1 h / 230 °C View Scheme

1: thionyl chloride / chloroform; N,N-dimethyl-formamide / 3 h / |Reflux 2: sodium azide / 1,4-dioxane; water / 0.5 h / 5 °C 3: chloroform; diphenylether / 1 h / 230 °C View Scheme

in dichloromethane