1.1: sodium hydride / ethylene glycol dimethyl ether; mineral oil / 0.17 h / 0 - 20 °C / Inert atmosphere 1.2: 6 h / Reflux 2.1: p-NO2-benzenesulfonyl azide; 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 3 h / 20 °C 3.1: Rh2[N-[(4-dodecylphenyl)sulfonyl]-(S)-prolinato]4 / toluene / 1.5 h / 0 °C / Inert atmosphere 4.1: chromium(VI) oxide; periodic acid / acetonitrile / 1 h / 20 °C 5.1: water; sodium chloride / dimethyl sulfoxide / 4 h / 155 - 165 °C View Scheme