1: potassium carbonate / N,N-dimethyl-formamide / 2 h / Inert atmosphere; Reflux 2: diethylaniline / 6 h / Reflux; Inert atmosphere 3: AlCl3, aluminium chloride; dimethylsulfide / dichloromethane / 0 - 30 °C View Scheme

1: potassium carbonate / N,N-dimethyl-formamide / 2 h / Inert atmosphere; Reflux 2: diethylaniline / 6 h / Reflux; Inert atmosphere 3: AlCl3, aluminium chloride; dimethylsulfide / dichloromethane / 0 - 30 °C 4: potassium carbonate / N,N-dimethyl-formamide / 0.5 h / Reflux; Inert atmosphere View Scheme