1.1: ethylenediamine / tetrahydrofuran / 0 - 20 °C / Inert atmosphere 2.1: iodosylbenzene / tetrahydrofuran / 20 °C / Inert atmosphere 3.1: acetic acid; zinc / tetrahydrofuran / 0 - 20 °C / Inert atmosphere 4.1: hydrogenchloride / dioxanes / 24 h / Inert atmosphere 4.2: 48 h 4.3: Inert atmosphere View Scheme