1: iron; acetic acid / ethanol / 1 h / Inert atmosphere; Reflux 2: N-bromosuccinmide / acetonitrile / 0.25 h / 0 °C / Inert atmosphere 3: 4-(N,N-dimethlyamino)pyridine / N,N-dimethyl-formamide / 18 h / 20 °C / Inert atmosphere 4: palladium(II) dichloride bis[bis(diphenylphosphine)ferrocene] dichloromethane; potassium acetate / dimethyl sulfoxide / 12 h / 80 °C / Inert atmosphere 5: hydrogenchloride / 1,4-dioxane; dichloromethane; water / 12 h / 40 °C / Inert atmosphere 6: bis-triphenylphosphine-palladium(II) chloride; sodium carbonate / ethylene glycol dimethyl ether; water / 16 h / 87 °C / Inert atmosphere 7: hydrogenchloride / 1,4-dioxane; methanol; water / 1 h / Inert atmosphere View Scheme

di-isopropyl azodicarboxylate; triphenylphosphine in tetrahydrofuran T=0 - 20°C; 4 h; Inert atmosphere;

1: iron; acetic acid / ethanol / 1 h / Inert atmosphere; Reflux 2: N-bromosuccinmide / acetonitrile / 0.25 h / 0 °C / Inert atmosphere View Scheme

iron in ethanol; acetic acid 1 h; Heating / reflux;