1.1: hydrogen / palladium 10 on activated carbon / ethyl acetate; water / 60 °C / 3000.3 Torr 2.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / 1 h / -70 - -60 °C 2.2: -70 - 0 °C 3.1: sodium hydroxide; sodium dihydrogenphosphate / Lipase PS SD / acetone / 50 °C / pH 7 / Enzymatic reaction 4.1: sulfuric acid / acetonitrile; water / 15 °C View Scheme