potassium carbonate in N,N-dimethyl-formamide 4 h; RefluxInert atmosphere;

1: toluene; butan-1-ol / 3 h / |Reflux; |Inert atmosphere 2: potassium carbonate / N,N-dimethyl-formamide / 4 h / |Reflux; |Inert atmosphere View Scheme

triethylamine in dichloromethane T=20°C; Inert atmosphere;