1.1: IPNBSH; triphenylphosphine; diethylazodicarboxylate / tetrahydrofuran; toluene / 1.5 h / 0 - 20 °C / Inert atmosphere 1.2: 1 h / 20 °C / Inert atmosphere 2.1: diisopropylamine; copper(ll) bromide / 1,4-dioxane / 6 h / 20 °C / Inert atmosphere; Reflux View Scheme