1.1: IPNBSH; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; toluene / 2 h / 0 - 20 °C / Inert atmosphere 1.2: 4 h / 20 °C / Inert atmosphere 2.1: copper(II) bis(trifluoromethanesulfonate); diisopropylamine / 1,4-dioxane / 1 h / Inert atmosphere; Reflux 3.1: toluene / 3 h / Inert atmosphrere; Reflux View Scheme