1.1: trichlorophosphate / dichloromethane / 0 - 105 °C / Inert atmosphere 2.1: potassium carbonate / toluene / 25 - 115 °C / Inert atmosphere; Reflux 3.1: diisobutylaluminium hydride / dichloromethane / 0 - 5 °C / Inert atmosphere 3.2: 0 - 30 °C View Scheme