1.1: N-ethyl-N,N-diisopropylamine / butan-1-ol / 8 h / Reflux 2.1: sodium hydroxide; water / 20 °C 2.2: pH 6 - 6.5 3.1: triethylamine; phenylphosphoric acid dichloride / dichloromethane / 0 - 20 °C / Inert atmosphere View Scheme