1.1: N-ethyl-N,N-diisopropylamine / 1,2-dichloro-ethane / 95 °C / |Inert atmosphere 2.1: iodine; sodium carbonate / tetrahydrofuran; water / 5 h / 20 °C / |Inert atmosphere 3.1: 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 0.25 h / 20 °C / |Inert atmosphere 3.2: 20 °C / |Inert atmosphere 4.1: FeCl3·6H2O / dichloromethane; methanol / 0.5 h / 20 °C / |Inert atmosphere View Scheme

1.1: N-ethyl-N,N-diisopropylamine / 1,2-dichloro-ethane / 95 °C / |Inert atmosphere 2.1: iodine; sodium carbonate / tetrahydrofuran; water / 5 h / 20 °C / |Inert atmosphere 3.1: 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 0.25 h / 20 °C / |Inert atmosphere 3.2: 20 °C / |Inert atmosphere 4.1: FeCl3·6H2O / dichloromethane; methanol / 0.5 h / 20 °C / |Inert atmosphere View Scheme

boron triethoxide; 2,2,2-trifluoroethanol; trifluoroacetic acid 5.5 h; Ambient temperature;