1: potassium carbonate / dimethyl sulfoxide / 2 h / Reflux 2: water; sodium hydroxide / methanol / 1 h / Reflux 3: pyridine; thionyl chloride / benzene / 1.5 h / Reflux 4: pyridine; 4-(N,N-dimethlyamino)pyridine / chloroform / 5 h / Inert atmosphere View Scheme

1: pyridine; thionyl chloride / benzene / 1.5 h / Reflux 2: pyridine; 4-(N,N-dimethlyamino)pyridine / chloroform / 5 h / Inert atmosphere View Scheme

1: water; sodium hydroxide / methanol / 1 h / Reflux 2: pyridine; thionyl chloride / benzene / 1.5 h / Reflux 3: pyridine; 4-(N,N-dimethlyamino)pyridine / chloroform / 5 h / Inert atmosphere View Scheme

1: potassium carbonate / dimethyl sulfoxide / 2 h / Reflux 2: water; sodium hydroxide / methanol / 1 h / Reflux 3: pyridine; thionyl chloride / benzene / 1.5 h / Reflux 4: pyridine; 4-(N,N-dimethlyamino)pyridine / chloroform / 5 h / Inert atmosphere View Scheme

pyridine; 4-(N,N-dimethlyamino)pyridine in chloroform 5 h; Inert atmosphere;