1: N,N-dimethyl-formamide / 60 h / 90 °C / |Sealed tube 2: potassium carbonate / methanol / 24 h / 70 °C 3: lithium aluminium tetrahydride / tetrahydrofuran / 2 h / 20 °C / |Inert atmosphere; |Reflux View Scheme

1: N,N-dimethyl-formamide / 60 h / 90 °C / |Sealed tube 2: potassium carbonate / methanol / 24 h / 70 °C 3: lithium aluminium tetrahydride / tetrahydrofuran / 2 h / 20 °C / |Inert atmosphere; |Reflux 4: sulfuric acid / water / 312 h / 20 °C View Scheme

1: N,N-dimethyl-formamide / 60 h / 90 °C / |Sealed tube 2: potassium carbonate / methanol / 24 h / 70 °C 3: lithium aluminium tetrahydride / tetrahydrofuran / 2 h / 20 °C / |Inert atmosphere; |Reflux 4: sulfuric acid / water / 312 h / 20 °C View Scheme