1.1: acetic acid / 18 h / 20 °C 2.1: palladium diacetate; copper diacetate; potassium carbonate / N,N-dimethyl-formamide / 4 h / 80 °C / |Inert atmosphere 3.1: trifluoroacetic acid / dichloromethane / 0 °C / |Inert atmosphere 3.2: 5 h 4.1: lithium aluminium tetrahydride / tetrahydrofuran / 4 h / 0 °C View Scheme

1.1: acetic acid / 18 h / 20 °C 2.1: palladium diacetate; copper diacetate; potassium carbonate / N,N-dimethyl-formamide / 4 h / 80 °C / |Inert atmosphere 3.1: trifluoroacetic acid / dichloromethane / 0 °C / |Inert atmosphere 3.2: 5 h 4.1: lithium aluminium tetrahydride / tetrahydrofuran / 4 h / 0 °C View Scheme