o-nitrobenzenesulfonyl hydrazide; triphenylphosphine; diethylazodicarboxylate in various solvent(s)

1: 1H-imidazole; triphenylphosphine; iodine / tetrahydrofuran / 0.5 h / 20 °C 2: tetra-(n-butyl)ammonium iodide; potassium hydroxide / benzene; water / 20 h / |Reflux 3: Rh2(cap)4; tert.-butylhydroperoxide / methanol-d4 / 1.5 h / 40 °C View Scheme